Academic literature on the topic 'Dissolution and precipitation processes'

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Journal articles on the topic "Dissolution and precipitation processes"

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Jordan, Guntram, Thomas Lohkämper, Martin Schellewald, and Wolfgang W. Schmahl. "Investigation of loaded halite-SiO2 interfaces undergoing dissolution-precipitation processes." European Journal of Mineralogy 17, no. 3 (June 14, 2005): 399–409. http://dx.doi.org/10.1127/0935-1221/2005/0017-0399.

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Aurian-Blajeni, Benedict, Michael Kramer, and Micha Tomkiewicz. "Computer simulation of dissolution-precipitation processes." Journal of Physical Chemistry 91, no. 3 (January 1987): 600–605. http://dx.doi.org/10.1021/j100287a023.

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Hanschmann, Benedikt. "Precipitation of Polypropylene and Polyethylene Terephthalate Powders Using Green Solvents via Temperature and Antisolvent-Induced Phase Separation." Advances in Polymer Technology 2023 (November 30, 2023): 1–11. http://dx.doi.org/10.1155/2023/7651796.

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Polymer dissolution and precipitation are two common processes for the production of polymer powders, especially for cases where usual means of comminution are not applicable. I investigated six dissolution–precipitation processes based on high-boiling sustainable green organic solvents and antisolvents for the polypropylene and polyethylene terephthalate with respect to apparent particle morphology for a closed loop production scheme. Of the investigated processes two are considered antisolvent-induced precipitations whereas the other four can be considered temperature induced. The applied solvents included p-cymene, dibutoxymethane, ethylbenzoate, γ-valerolactone, ethanol, and hexanol. All processes yielded powders consisting of agglomerated primary particles at a powder dry substance of less than 25% by weight. The produced powders consist in all cases of agglomerates of smaller primary particles.
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Sadd, Matthew, Salvatore De Angelis, Sofie Colding‐Jørgensen, Didier Blanchard, Rune E. Johnsen, Simone Sanna, Elena Borisova, Aleksandar Matic, and Jacob R. Bowen. "Visualization of Dissolution‐Precipitation Processes in Lithium–Sulfur Batteries." Advanced Energy Materials 12, no. 10 (January 22, 2022): 2103126. http://dx.doi.org/10.1002/aenm.202103126.

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Wu, Gang, and M. M. Sharma. "Model for precipitation and dissolution processes with precipitate migration." AIChE Journal 35, no. 8 (August 1989): 1385–90. http://dx.doi.org/10.1002/aic.690350819.

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Ahmed, Anwar Qasim, Dániel Olasz, Elena V. Bobruk, Ruslan Z. Valiev, and Nguyen Q. Chinh. "Effect of the Equal Channel Angular Pressing on the Microstructure and Phase Composition of a 7xxx Series Al-Zn-Mg-Zr Alloy." Materials 16, no. 19 (October 7, 2023): 6593. http://dx.doi.org/10.3390/ma16196593.

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A supersaturated Al-4.8%Zn-1.2%Mg-0.14%Zr (wt%) alloy was processed by the equal-channel angular pressing (ECAP) technique at room temperature in order to obtain an ultrafine-grained (UFG) microstructure having an average grain size of about 260 nm. The hardness and microstructural characteristics, such as the phase composition and precipitations of this UFG microstructure were studied using depth-sensing indentation (DSI), transmission electron microscopy (TEM), as well as non-isothermal scanning of differential scanning calorimetry (DSC), and compared to the properties of the un-deformed sample. Emphasis was placed on the effect of the UFG microstructure on the subsequent thermal processes in DSC measurements. It has been shown that the ECAP process resulted in not only an ultrafine-grained but also a strongly precipitated microstructure, leading to a hardness (2115 MPa) two and a half times higher than the initial hardness of the freshly quenched sample. Because of the significant changes in microstructure, ECAP has also a strong effect on the dissolution (endothermic) and precipitation (exothermic) processes during DSC measurements, where the dissolution and precipitation processes were quantitatively characterized by using experimentally determined specific enthalpies, ΔH and activation energies, Q.
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Meakin, Paul, and Bjørn Jamtveit. "Geological pattern formation by growth and dissolution in aqueous systems." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, no. 2115 (November 26, 2009): 659–94. http://dx.doi.org/10.1098/rspa.2009.0189.

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Progress towards the development of a better understanding of the formation of geological patterns in wet systems due to precipitation and dissolution is reviewed. Emphasis is placed on the formation of terraces, stalactites, stalagmites and other carbonate patterns due to precipitation from flowing supersaturated solutions and the formation of scallops by dissolution in undersaturated turbulent fluids. In addition, the formation of spherulites, dendrites and very large, essentially euhedral, crystals is discussed. In most cases, the formation of very similar patterns as a result of the freezing/melting of ice and the precipitation/dissolution of minerals strongly suggests that complexity associated with aqueous chemistry, interfacial chemistry and biological processes has only a secondary effect on these pattern formation processes.
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Dubinina, Elena O., and Leonid Z. Lakshtanov. "A kinetic model of isotopic exchange in dissolution-precipitation processes." Geochimica et Cosmochimica Acta 61, no. 11 (June 1997): 2265–73. http://dx.doi.org/10.1016/s0016-7037(97)00076-8.

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Turpault, Marie-Pierre, Gilles Berger, and Alain Meunier. "Dissolution-precipitation processes induced by hot water in a fractured granite Part 1: Wall-rock alteration and vein deposition processes." European Journal of Mineralogy 4, no. 6 (December 15, 1992): 1457–76. http://dx.doi.org/10.1127/ejm/4/6/1457.

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Slimani, Rabia, Abdelhamid Guendouz, Fabienne Trolard, Adnane Souffi Moulla, Belhadj Hamdi-Aïssa, and Guilhem Bourrié. "Identification of dominant hydrogeochemical processes for groundwaters in the Algerian Sahara supported by inverse modeling of chemical and isotopic data." Hydrology and Earth System Sciences 21, no. 3 (March 21, 2017): 1669–91. http://dx.doi.org/10.5194/hess-21-1669-2017.

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Abstract. Unpublished chemical and isotopic data taken in November 1992 from the three major Saharan aquifers, namely the Continental Intercalaire (CI), the Complexe Terminal (CT) and the phreatic aquifer (Phr), were integrated with original samples in order to chemically and isotopically characterize the largest Saharan aquifer system and investigate the processes through which groundwaters acquire their mineralization. Instead of classical Debye–Hückel extended law, a specific interaction theory (SIT) model, recently incorporated in PHREEQC 3.0, was used. Inverse modeling of hydrochemical data constrained by isotopic data was used here to quantitatively assess the influence of geochemical processes: at depth, the dissolution of salts from the geological formations during upward leakage without evaporation explains the transitions from CI to CT and to a first end member, a cluster of Phr (cluster I); near the surface, the dissolution of salts from sabkhas by rainwater explains another cluster of Phr (cluster II). In every case, secondary precipitation of calcite occurs during dissolution. All Phr waters result from the mixing of these two clusters together with calcite precipitation and ion exchange processes. These processes are quantitatively assessed by the PHREEQC model. Globally, gypsum dissolution and calcite precipitation were found to act as a carbon sink.
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Dissertations / Theses on the topic "Dissolution and precipitation processes"

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Rembert, Flore. "Development of geo-electrical methods to characterize dissolution and precipitation processes in a carbonate context." Electronic Thesis or Diss., Sorbonne université, 2021. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2021SORUS114.pdf.

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La précipitation et la dissolution de la calcite sont des processus primordiaux dans les roches carbonatées et le fait de pouvoir les surveiller in situ est un enjeu majeur. Les méthodes hydrogéophysiques sont fondées sur le développement de techniques géophysiques appropriées pour le suivi des processus hydrologiques et biogéochimiques de manière non-intrusive et à faible coût. Parmi les techniques existantes, les méthodes électriques ont déjà prouvé leur capacité à surveiller de tels processus. Pour cette raison, les méthodes du potentiel spontané (PS) et de la polarisation provoquée spectrale (PPS) ont été choisies pour investiguer les processus de dissolution et de précipitation de la calcite. La PS est une technique passive consistant à mesurer le champ électrique naturel généré par les flux d’eau et les gradients de concentration, tandis que la PPS est une méthode active mesurant la conductivité électrique complexe aux basses fréquences (mHz-kHz). Ses composantes réelle et imaginaire peuvent être reliées respectivement à la microstructure et à l’état de surface des minéraux le constituant. Cette thèse présente des développements expérimentaux et théoriques afin d'améliorer l’interprétation des méthodes PS et PPS. Un nouveau modèle de conductivité électrique est développé et montre un bon ajustement avec les résultats numériques de dissolution et de précipitation. Des données PS remarquables ont été obtenues et ont pu être reliées quantitativement grâce à de la modélisation de transport réactif. Les résultats PPS nourrissent la réflexion sur les mécanismes responsables des variations de polarisation engendrés par la réactivité de la calcite
Precipitation and dissolution of calcite are key processes in carbonate rocks and being able to monitor them in situ is a major issue. Hydrogeophysical methods are based on the development of appropriate geophysical techniques for monitoring hydrological and biogeochemical processes in a non-intrusive and low-cost manner. Among the existing techniques, electrical methods have already proven their ability to monitor such processes. For this reason, the methods of self-potential (SP) and spectral induced polarization (SIP) were chosen to investigate the processes of dissolution and precipitation of calcite. SP is a passive technique consisting in measuring the natural electric field generated by water flows and concentration gradients, while SIP is an active method measuring the complex electrical conductivity at low frequencies (mHz-kHz). Its real and imaginary components can be related respectively to the microstructure and surface state of the minerals constituting it. This thesis presents experimental and theoretical developments in order to improve the interpretation of SP and SIP methods. A new electrical conductivity model is developed and shows a good fit with the numerical results of dissolution and precipitation. Remarkable SP data have been obtained and could be quantitatively linked through reactive transport modeling. The SIP results provide further insights into the mechanisms responsible for the polarization variations caused by the reactivity of calcite
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Nitschke, Fabian [Verfasser], and T. [Akademischer Betreuer] Kohl. "Numerical and Experimental Characterization of Dissolution and Precipitation Processes in Deep Geothermal Reservoirs / Fabian Nitschke ; Betreuer: T. Kohl." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1151938637/34.

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Stoor, T. (Tuomas). "Air in pulp and papermaking processes." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514280784.

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Abstract A pulp suspension consists of water, fibres, fines, fillers and chemicals, but air or other gases are also present in practically all pulping processes either in dissolved form or as bubbles. Dissolved gases seldom disturb the processes, but they are readily converted to gaseous form when conditions change. The gas bubbles affect the properties of the pulp suspension, reduce the accuracy of certain measurements, interfere with the runability of the papermachine and detract from the quality of the end-product. Gases are removed from the process by either mechanical or chemical means, resulting in increased investments and operational costs. The aim of this work was to study the behaviour of gas in pulp and papermaking processes with laboratory, pilot-scale and mill-scale experiments. Five main areas of the research can be identified: 1. Occurrence of gases in pulp and paper mill processes, 2. Dissolution, precipitation and hold-up of gases in the pulp suspension and mill water, 3. Effects of gases on certain consistency measurements, centrifugal pumping and operation of the hydrocyclone. 4. Measurement of the gas content of the pulp suspension by compression, radiometric, microwave and sonar methods and 5. Removal of gases with a centrifugal pump equipped with vacuum pump or hydrocyclone equipped light reject removal. The results show that the dissolution and precipitation of gas is strongly dependent on the pulp and water properties. Dissolved and colloidal material reduces the solubility potential of gas, but also accelerates the precipitation of dissolved gases in gaseous form. The hold-up of precipitated gas bubbles was found to be much more pronounced in hydrophobic mechanical pulps than in lignin-free chemical pulps. The accuracy of consistency measurements was affected by free gas in the pulp suspension, requiring special attention when assessing the results. The operation of pressure screens and hydrocyclones was affected only at high volumes of free gas in the feed suspension. According to the experiments, a reliable gas content measurement can be achieved by in-line radiometric, microwave or sonar methods, and also by the off-line compression method if a representative sample is obtained. A centrifugal pump equipped with a gas removing unit is designed mainly to ensure undisturbed pumping, whereas its gas removal efficiency remains quite low, especially with small bubbles and at a low gas content. The gas removal efficiency of a hydrocyclone equipped with light reject removal is good, but decreases with small precipitated bubbles. These results offer new information of the behaviour of the gas in pulp suspensions and white water and underline the importance of the bubble generation mechanism in this context.
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Villinski, John Eugene. "Reductive dissolution of manganese (IV) oxides and precipitation of iron (III) : implications for redox processes in an alluvial aquifer affected by acid mine drainage." Diss., The University of Arizona, 2001. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_2001_96_sip1_w.pdf&type=application/pdf.

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Küsters, Tim Gerrit [Verfasser], Thomas [Gutachter] Müller, and Jörg [Gutachter] Renner. "Experimental study on fluid-rock interaction and dissolution/precipitation processes at low temperatures with implications for industrial geothermal exploration / Tim Gerrit Küsters ; Gutachter: Thomas Müller, Jörg Renner ; Fakultät für Geowissenschaften." Bochum : Ruhr-Universität Bochum, 2018. http://d-nb.info/1155587944/34.

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Devigne, Vincent Graillot Didier Mikelic Andro Batton-Hubert Mireille. "Écoulements et conditions aux limites particulières appliquées en hydrogéologie et théorie mathématique des processus de dissolution / précipitation en milieux poreux = Flows and Particular Boundary Conditions applied in Hydrogeology and Mathematical Theory of Dissolution/Precipitation process in porous media." Lyon : [s.n], 2006. http://tel.archives-ouvertes.fr/docs/00/13/20/36/PDF/UCBL_manuscrit.pdf.

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Van, der Houwen Jacqueline A. M. "Chemical principles of calcium phosphate dissolution and precipitation." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272517.

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Frisby, Brandi N. "Communicative facework in marital dissolution and post-dissolution processes." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/11241.

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Thesis (Ph. D.)--West Virginia University, 2010.
Title from document title page. Document formatted into pages; contains viii, 159 p. Includes abstract. Includes bibliographical references (p. 108-125).
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Zauner, Rudolf. "Scale-up of precipitation processes." Thesis, University College London (University of London), 1999. http://discovery.ucl.ac.uk/1317927/.

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This thesis concerns the scale-up of precipitation processes aimed at predicting product particle characteristics. Although precipitation is widely used in the chemical and pharmaceutical industry, successful scale-up is difficult due to the absence of a validated methodology. It is found that none of the conventional scale-up criteria reported in the literature (equal power input per unit mass, equal tip speed, equal stirring rate) is capable of predicting the experimentally observed effects of the mixing conditions on kinetic rates and particle characteristics. As a result of high gradients in the supersaturation field during precipitation, particularly in the feed zone, high local gradients in the nucleation rate are to be expected. In this thesis, a compartmental mixing model (Segregated Feed Model SFM) linked to the population balance is proposed for scaling up both continuous and semibatch precipitation processes, and is validated with experiments on different scales. Experiments were carried out using two chemical systems (calcium oxalate CaC₂O₄ and calcium carbonate CaCO₃), varying the residence time/feed time, feed concentration, feed point position, impeller type, feed tube diameter and stirring rate in geometrically similar reactors ranging from 0.3 to 301. A new procedure is introduced in order to solve the inverse problem for determination of the kinetic parameters for nucleation, growth, disruption and agglomeration from the particle size distributions obtained in the continuous laboratory-scale experiments. This method, where the kinetic rates were extracted separately and sequentially from the particle size distribution, was found to be a reliable alternative to the conventional simultaneous estimation of all kinetic parameters from the distribution. Using the kinetic parameters extracted from the laboratory-scale experiments, the population balance is solved within the Segregated Feed Model. The local mixing parameters also required for solving the SFM are obtained from a sliding mesh Computational Fluid Dynamics (CFD) model. These are used to specify the different micromixing and mesomixing conditions in the feed and bulk zones of the reactor. The model accurately predicts the mean size, coefficient of variation and nucleation rate on different scales for different process and mixing conditions in both continuous and semibatch mode of operation. Furthermore, the model confirms the observed greater effect of mixing on product particle characteristics in semibatch than in continuous operation. This is thought to be due to direct mixing of the feed solution in semibatch operation with the other component already present in the reactor. The methodology proposed here for the scale-up of precipitation processes is very versatile and computationally efficient. It combines the advantages of both a CFD and a population balance approach without having to solve the equations together, which is currently still impracticable due to the excessive computational demand and simulation time required.
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DELAGE, STEPHANIE. "Cinetique couplees au voisinage des surfaces : segregation, precipitation et dissolution." Paris 6, 1998. http://www.theses.fr/1998PA066458.

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Dans la plupart des alliages metalliques, la composition de la surface differe de celle du volume. Ce phenomene, appele segregation superficielle, a fait l'objet jusqu'a present de beaucoup d'etudes, principalement sur des alliages ayant atteint l'equilibre thermodynamique dans le domaine de la solution solide. Le sujet de la these a ete centre autour de l'etude par simulations numeriques du phenomene de segregation lors des cinetiques de dissolution et de precipitation. Ce travail est illustre par l'etude du systeme fe-cu. A l'aide d'un modele de diffusion a l'echelle atomique couple a deux approches statistiques complementaires nous avons etudie, d'une part les modes de dissolution de depots, et d'autre part l'influence de la surface sur les cinetiques de demixtion. Tout d'abord, les cinetiques de dissolution de depots fe/cu et cu/fe ont ete abordees a l'aide de l'approximation de champ moyen. Lorsque l'energie de surface de l'element depose est superieure a celle du substrat (cas des depots fe/cu), l'element du substrat remonte en surface et forme une couche flottant sur le depot. Dans le cas des depots epais, une alternance entre deux modes de dissolution du precipite donne lieu a une grande variete de comportements pilotes par la temperature et l'epaisseur du depot. Nous avons montre que les differentes configurations observees au cours de la cinetique sont a l'equilibre local, ceci expliquant la persistance de configurations, et meme les transitions abruptes pouvant intervenir entre certaines d'entre elles. La seconde partie de ce travail a concerne les cinetiques de demixtion en couche mince. Des simulations monte-carlo ont permis de suivre l'evolution des configurations au cours du temps, pour differentes compositions du systeme et differentes epaisseurs de couche mince. Nous avons mis en evidence une decomposition pilotee par la surface avec la creation d'une couche mouillante de cuivre, progressant vers le coeur de la couche au cours du temps. Ce processus est couple a la formation de domaines au sein de la couche, menant a des comportements varies et complexes, suivant la concentration moyenne et l'epaisseur de la couche.
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Books on the topic "Dissolution and precipitation processes"

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1956-, Briedis Daina M., and Ramanarayanan Kuttanchery A. 1952-, eds. Fundamental aspects of crystallization and precipitation processes. New York, N.Y: American Institute of Chemical Engineers, 1987.

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Motohiro, Kanno, and United States. National Aeronautics and Space Administration., eds. The precipitation processes of Cu-Zr-Cr alloys. Washington, DC: National Aeronautics and Space Administration, 1988.

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Symposium, on High Rate Metal Dissolution Processes (1995 Chicago Ill ). Proceedings of the Symposium on High Rate Metal Dissolution Processes. Pennington, NJ: Electrochemical Society, 1996.

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Lukanin, Aleksandr. Engineering ecology: processes and devices sewage treatment and recycling of precipitation. ru: INFRA-M Academic Publishing LLC., 2017. http://dx.doi.org/10.12737/22139.

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The book describes the composition and properties of wastewater, shows the main methods of sewage treatment, the basic techniques of sludge treatment, as well as hardware design of these processes. Also in the manual covers the methods, processes and devices for mechanical and biological wastewater treatment, as well as processing and recycling of sludge, are the methods of calculations related equipment. Compliant with the Federal state educational standard of the latest generation of higher education. The publication is intended for students directions "Technosphere safety" (20.03.01, 20.04.01), "Ecology and Nature" (05.03.06, 05.04.06), as well as the "Industrial Ecology and Biotechnology» (19.00.00). Also, the benefit will be useful to professionals working in the field of environmental engineering.
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Wei, H. Application of computational fluid dynamics techniques to the modelling of precipitation processes. Manchester: UMIST, 1997.

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Müller, Klaus. Prognose von Niederschlagswahrscheinlichkeiten an einer Station (Berlin). Berlin: D. Reimer, 1986.

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service), SpringerLink (Online, ed. Free-Radical Retrograde-Precipitation Polymerization (FRRPP): Novel Concepts, Processes, Materials, and Energy Aspects. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2010.

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Groen, Maria Margaretha de. Modelling interception and transpiration at monthly time steps: Introducing daily variability through Markov chains. Lisse: Swets & Zeitlinger, 2002.

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Periodic precipitation: A microcomputer analysis of transport and reaction processes in diffusion media, with software development. Oxford [England]: Pergamon, 1991.

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NATO Advanced Research Workshop on Acid Deposition Processes at High Elevation Sites (1986 Edinburgh, Scotland). Acid deposition processes at high elevation sites: Proceedings of the NATO Advanced Research Workshop on Acid Deposition Processes at High Elevation Sites, Edinburgh, Scotland, 8-13 September 1986. Dordrecht: Kluwer Academic Publishers, 1988.

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Book chapters on the topic "Dissolution and precipitation processes"

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Lo, Irene M. C., and Keith C. K. Lai. "Couples of Precipitation-Dissolution and Reduction-Oxidation Reactions." In Natural Processes and Systems for Hazardous Waste Treatment, 41–93. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/9780784409398.ch03.

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Dreybrodt, Wolfgang. "Dissolution and Precipitation of Calcite: The Chemistry of the Heterogeneous Surface." In Processes in Karst Systems, 103–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83352-6_6.

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Dreybrodt, Wolfgang. "Modelling the Kinetics of Calcite Dissolution and Precipitation in Natural Environments of Karst Areas." In Processes in Karst Systems, 140–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83352-6_7.

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Wilkinson, Jamie J. "The Potential of Zn Isotopes in the Science and Exploration of Ore Deposits." In Isotopes in Economic Geology, Metallogenesis and Exploration, 451–63. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_15.

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AbstractSince the turn of the Century, the growth in development and application of zinc isotopes to multiple fields in terrestrial and planetary sciences has been exponential. The potential for the application of zinc isotope systematics to ore deposit formation processes was obvious from the outset, given that they represent the most significant concentrations of zinc on Earth and because this approach allowed, for the first time, direct assessment of zinc metal origins and transport. This contribution presents a brief summary of the notation and analytical procedures for analysis of zinc isotopes and summarizes the terrestrial data reported to date. These results show that the variation in zinc isotope composition in rocks and ore systems is in fact rather small (< 2 ‰), linked, at least in part, to the single oxidation state in which zinc occurs in nature. Based on an assessment of the literature, the principal mechanisms for causing isotopic fractionation are all relatively low temperature processes: (i) biogenic; (ii) supergene dissolution-reprecipitation; (iii) adsorption–desorption reactions; and (iv) hydrothermal precipitation. High temperature igneous processes do not appear to produce significant isotopic variations. In ore deposit studies, it currently appears unlikely that zinc isotopes can be used to constrain potential metal sources, apart from zinc derived from carbonate host rocks which tends to be isotopically heavy. However, there are a number of systems in which systematic variation in δ66Zn of sulfides suggests that Rayleigh-type fractionation during ore mineral precipitation occurs, opening up the possibility of using zinc isotopes to trace flow paths and vector in towards mineralized centers. Modeling of such hydrothermal processes is currently hindered by a paucity of experimentally-determined fractionation factors, but as such work is done, our ability to better understand and utilize zinc isotopic zonation patterns for the purposes of mineral exploration will be progressively enhanced.
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Canfield, Donald E., and Robert Raiswell. "Carbonate Precipitation and Dissolution." In Topics in Geobiology, 411–53. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-5034-5_9.

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Sverdrup, H. U. "The Dissolution Efficiency for Different Stream Liming Methods." In Acidic Precipitation, 1881–91. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3385-9_182.

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Francuskiewicz, Frieder. "Dissolution and Precipitation of Polymers." In Polymer Fractionation, 10–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78704-1_3.

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Wang, Lawrence K., David A. Vaccari, Yan Li, and Nazih K. Shammas. "Chemical Precipitation." In Physicochemical Treatment Processes, 141–97. Totowa, NJ: Humana Press, 2005. http://dx.doi.org/10.1385/1-59259-820-x:141.

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Li, Xiaofan, and Shouting Gao. "Tropical Precipitation Processes." In Precipitation Modeling and Quantitative Analysis, 63–109. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2381-8_3.

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Datta, Madhav. "Open-Circuit Metal Dissolution Processes." In Electrodissolution Processes, 1–25. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2020. http://dx.doi.org/10.1201/9780367808594-1.

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Conference papers on the topic "Dissolution and precipitation processes"

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Lombard, J. M., P. Egermann, O. Vizika, S. Bekri, and B. Bazin. "Injectivity Impairment Due to Dissolution/Precipitation Processes During a CO2 Injection." In IOR 2007 - 14th European Symposium on Improved Oil Recovery. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609-pdb.24.a16.

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Farooqui, Nazia M., K. S. Sorbie, and L. S. Boak. "The Solubility and Dissolution of PPCA_Ca Complex in Precipitation Squeeze Processes." In SPE International Oilfield Scale Conference and Exhibition. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/179894-ms.

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Kang, Q., M. Liu, J. W. Carey, and H. S. Viswanathan. "3D Pore-Scale Modeling of Mineral Dissolution and Precipitation in Fractured Rocks." In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0737.

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ABSTRACT We present a pore-scale numerical modeling study of coupled fluid flow, solute transport, and mineral dissolution/precipitation in 3D fractured carbonate rocks. The injected fluid can dissolve the carbonate and release carbonate ions into the solutions, which react with Ba2+ resulting in barium carbonates (BaCO3) precipitation. Both a simplified fracture and a complex fracture geometry extracted from real shale images are considered. Simulations with a wide range of Pe and Da numbers are carried out to systematically study their effects on dissolution/precipitation patterns and on evolution of fracture geometry, porosity, and permeability. The results show that the coupled physicochemical process is strongly dependent on the Pe and Da. While similar trend of the permeability-porosity variations is obtained for the two fractures at the same Pe and Da numbers, the evolution of fracture morphology is different due to the difference in initial structure heterogeneity and wall roughness. This work reveals the interplay of advection, diffusion, and reaction in determining the fracture evolution and improves our understanding of fluid-mineral interactions in fractures. INTRODUCTION Fractures play an important role in providing preferred flow pathways in low-permeability formations and significantly enhance their permeability. They can improve gas production for shale reservoirs but can also increase the risks for leaking of CO2 from geological storage sites. The fluid-mineral reactions, including dissolution or precipitation, can cause the alteration of porous medium matrix or fracture wall. Particularly, mineral dissolution (precipitation) can increase (decrease) the pore/aperture size and hence the permeability of porous or fractured media. While there have been a lot of studies on mineral dissolution in porous or fractured media considering resultant pore-structure change (Chen, Kang, Viswanathan, et al., 2014; Kang et al., 2014; Kang et al., 2002; Liu & Mostaghimi, 2017; Rasoulzadeh et al., 2020; Starchenko et al., 2016; Verberg & Ladd, 2002; Verhaeghe et al., 2005, 2006), studies on mineral precipitation are much less (Deng et al., 2021; Kang et al., 2005; Kang et al., 2003; Menefee et al., 2020), and studies on coupled dissolution and precipitation are scarce (Chen, Kang, Carey, et al., 2014; Kang et al., 2010). Particularly, there is no high-resolution pore-scale modeling study on coupled dissolution and precipitation in three-dimensional (3D) fractures with evolving fracture geometry to our best knowledge. Consequently, the complex coupled processes including fluid flow, solute transport, dissolution/precipitation, and evolution of pore structure are not well understood.
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Strange, Michael A., Minghua Ren, and Stephen M. Rowland. "MICROBIALLY MEDIATED DISSOLUTION OF DETRITAL SANIDINE AND ITS REPRECIPITATION AS AUTHIGENIC ALBITE AND QUARTZ WITHIN EDIACARAN STROMATOLITES—UNIFYING MICROBIAL DISSOLUTION AND PRECIPITATION PROCESSES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-323287.

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Gan, Yifan, Qinglin Cheng, Zhihua Wang, Jinwei Yang, Wei Sun, and Yang Liu. "Molecular Dynamics Study on Microscopic Mechanism of Dissolution, Diffusion and Aggregation Process for Waxy Molecules in the Process of Waxy Crude Oil Pipeline Transportation." In ASME 2019 Asia Pacific Pipeline Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/appc2019-7602.

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Abstract In order to ensure the safe and economic operation of waxy crude oil transportation process, the micro-dynamic mechanism and thermodynamic characteristics of wax precipitation process at nanoscale are necessary to be revealed. Here, we established the molecular dynamics model to characterize the phase transition and precipitation behavior of waxy molecules in multiphase system (including oil, asphaltene and water), the relative error between simulated results and experimental data measured by Dutour et al. (2002) is less than 5%. Under the coupling effect of different operation parameters, the molecular dynamics simulation was employed, the simulated results showed that the spherical paraffin crystals underwent the process of dissolution, diffusion and aggregation, then the waxy cluster crystals with larger amount but smaller volume would form, and it would deposit on the outer wall under the concentration gradient. The influence mechanism of different operating parameters on wax precipitation was analyzed, of which the increase of temperature and water cut will decrease the wax precipitation, while the increase of pressure will enhance the wax precipitation rate, furthermore, by means of the hydrogen bonding and the effect of similar dissolution, the water and asphaltene molecules also affect the wax precipitation process at molecular-scale. The researches of this paper provide the theoretical support for the paraffin removal and control in waxy crude oil pipeline transportation process.
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Vesely, Andreas. "Processes for the Treatment of NORM and TENORM." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4623.

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By contract with the Austrian government, the ARC is treating radioactive waste from research institutions and industries. In the last years, one focus was the development of processes for the treatment of NORM and TENORM. Our goal in developing such processes is to recycle valuable compounds for further industrial usage and to concentrate the radioactive elements as far as possible, to save space in the waste storage facilities. Austria is an important producer of tungsten-thoria- and tungsten-molybdenum-thoria-cermets. Scrap is generated during the production process in the form of turnings and grinding sludge and dust. Although big efforts have been undertaken to replace Thorium compounds, waste streams from past production processes are still waiting for treatment. The total amount of this waste stored in Austria may be estimated to be approx. 100 tons. In close co-operation with the tungsten industries, recycling processes were tested and further developed at ARC in laboratory, bench scale and pilot plants. Three different approaches to solve the problem were studied: Dissolution of tungsten in molten iron in an arc or induction furnace, thus producing an Fe-W or Fe-W-Mo alloy. Slag is produced upon the addition of lime and clay. This slag extracts nearly all of the Thorium contained in the metal melt. Selective dissolution of Tungsten in aqueous alkaline medium after oxidation of the metal to the hexavalent state by heating the scrap in air at temperatures of 500°C to 600°C. The resulting oxides are treated with sodium hydroxide solution. Tungsten and Molybdenum oxides are readily dissolved, while Thorium oxide together with silicon and aluminum compounds remain insoluble and are separated by filtration. Sodium tungstate solution is further processed by the usual hydrometallurgical tungsten mill process. Oxidation and dissolution of Tungsten can be achieved in one step by an electrochemical process. Thus, thoriated Tungsten scrap is used as an anode in an electrolysis cell, while sodium hydroxide or ammonia serve as electrolyte. After dissolution of Tungsten, the solids are separated from the liquid by filtration. With the electrochemical process, treatment of Tungsten-Thoria scrap can be achieved with high throughput in rather small reactors at moderate temperatures and ordinary pressure. The Tungsten solution exhibits high purity. Another process which we examined in detail is the separation of radium from rare earth compounds. Radium was separated by co-precipitation with barium sulfate from rare earth chloride solutions. The efficiency of the separation is strongly pH-dependent. Again, the valuable rare earth compound can be reused, and the radioactive elements are concentrated.
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Tariq, Zeeshan, Ertugrul Umut Yildirim, Bicheng Yan, and Shuyu Sun. "Deep Learning Models for the Prediction of Mineral Dissolution and Precipitation During Geological Carbon Sequestration." In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212597-ms.

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Abstract In Geological Carbon Sequestration (GCS), mineralization is a secure carbon dioxide (CO2) trapping mechanism to prevent possible leakage at later stage of the GCS project. Modeling of the mineralization during GCS relies on numerical reservoir simulation, but the computational cost is prohibitively high due to the complex physical processes. Therefore, deep learning (DL) models can be used as a computationally cheaper and at the same time, reliable alternative to the conventional numerical simulators. In this work, we have developed a DL approach to effectively predict the dissolution and precipitation of various important minerals, including Anorthite, Kaolinite, and Calcite during CO2 injection into deep saline aquifers. We established a reservoir model to simulate the process of geological CO2 storage. About 750 simulations were performed in order to generate a comprehensive dataset for training DL models. Fourier Neural Operator (FNO) models were trained on the simulated dataset, which take the reservoir and well properties along with time information as input and predict the precipitation and dissolution of minerals in space and time scales. During the training process, root-mean-squared-error (RMSE) was chosen as the loss function to avoid overfitting. To gauge prediction performance, we applied the trained model to predict the concentrations of different mineral on the test dataset, which is 10% of the entire dataset, and two metrics, including the average absolute percentage error (AAPE) and the coefficient of determination (R2) were adopted. The R2 value was found to be around 0.95 for calcite model, 0.94 for Kaolinite model, and 0.93 for Anorthite model. The R2 was calculated for all trainable points from the predictions and ground truth. On the other hand, the average AAPE for all the mappings was calculated around 1%, which demonstrates that the trained model can effectively predict the temporal and spatial evolution of the mineral concentrations. The prediction CPU time (0.2 seconds/case) by the model is much lower than that of the physics-based reservoir simulator (3600 seconds/case). Therefore, the proposed method offers predictions as accurate as our physics-based reservoir simulations, while provides a huge saving of computation time. To the authors' best knowledge, prediction of the precipitation and dissolution of minerals in a supervised learning approach using the simulation data has not been studied before in the literature. The DL models developed in this study can serve as a computationally faster alternative to conventional numerical simulators to assess mineralization trapping in GCS projects especially for the mineral trapping mechanism.
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Fantozzi, D., V. Matikainen, M. Uusitalo, H. Koivuluoto, and P. Vuoristo. "Effect of Carbide Dissolution in the Metal Matrix of HVOF and HVAF Sprayed Cr3C2-NiCrMoNb Coatings on the Initial Stage of Chlorine High Temperature Corrosion." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0607.

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Abstract Highly corrosion and wear resistant thermally sprayed chromium carbide (Cr3C2) based cermets coatings are nowadays a potential highly durable solution to allow traditional fluidised bed combustors (FBC) to be operated with ecological waste and biomass fuels. However, the heat input of thermal spraying processes causes carbide dissolution in the metal binder. This alters the coating structure and forms carbon saturated amorphous and nanocrystalline metastable areas, which can affect the behaviour of the materials under the corrosive chlorides containing environment of the flue gases. This study analyses the effect of carbide dissolution in the metal matrix of MMC coatings and its effect on the onset of chlorine induced high temperature corrosion. Four Cr3C2-NiCrMoNb coatings were thermally sprayed with high-velocity air-fuel (HVAF) and high-velocity oxygen-fuel (HVOF) spray processes in order to obtain microstructures with increasing amount of carbide dissolution in the metal matrix. The specimens were heat treated in an inert argon atmosphere at 700°C for 5 hours to induce secondary carbide precipitation. As-sprayed and heat-treated self-standing coatings were covered with KCl and their corrosion resistance was investigated with thermogravimetric analysis (TGA) at 550°C for 4 hours. High carbon dissolution in the metal matrix appeared to be a detrimental factor in the initial stage of corrosion. The microstructural changes induced by the heat treatment hindered the corrosion onset in the coatings. Moreover, an optimal amount of oxides and melting degree seemed beneficial.
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Nash, Susan Smith. "The Importance of Geology in Geothermal Development and Critical Minerals Development." In Offshore Technology Conference. OTC, 2024. http://dx.doi.org/10.4043/35376-ms.

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Abstract This paper provides a summary and overview of the geological features and processes vital in the identification and development of geothermal reservoirs, with special consideration to different categories of geothermal systems, and the relationships to critical mineral-rich brines. The methods used in this investigation included the review and evaluation of geological aspects of known reservoirs that have data consisting of well logs, cores, microseismic, and geochemical analysis of fluids. Specifically, faults and fracture networks, primary and secondary porosity, and diagenetic alteration (dissolution, precipitation, cementation, and more) were evaluated, including work with scanning electron microscopy to evaluate the timing, sequence, and processes in the diagenetic alteration.
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Bastidas, Manuela, Sohely Sharmin, Carina Bringedal, and Sorin Pop. "A numerical scheme for two-scale phase-field models in porous media." In VI ECCOMAS Young Investigators Conference. València: Editorial Universitat Politècnica de València, 2021. http://dx.doi.org/10.4995/yic2021.2021.12571.

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A porous medium is a highly complex domain, in which various processes can take place at different scales. Examples in this sense are the multi-phase flow and reactive transport. Here, due to processes like dissolution or precipitation, or chemical deposition, which are encountered at the scale of pores (the micro-scale), the local structure and geometry of the pores may change, impacting the fluid flow. Since these micro-scale processes depend on the model unknowns (e.g., the solute concentration), free boundaries are encountered, separating the space available for flow from the solid, impermeable part in the medium. Here we consider a phase-field approach to model the evolution of the evolving interfaces at the micro-scale. For mineral precipitation and dissolution, we have evolving fluid-solid interfaces. If considering multi-phase flow, evolving fluid-fluid interfaces are also present. After applying a formal homogenization procedure, a two-scale phase-field model is derived, describing the averaged behavior of the system at the Darcy scale (the macro-scale). In this two-scale model, the micro and the macro scale are coupled through the calculation of the effective parameters. Although the resulting two-scale model is less complex than the original, the numerical strategies based on the homogenization theory remain computationally expensive as they require the computation of several problems over different scales, and in each mesh element. Here, we propose an adaptive two-scale scheme involving different techniques to reduce the computational effort without affecting the accuracy of the simulations. These strategies include iterations between scales, an adaptive selection of the elements wherein effective parameters are computed, adaptive mesh refinement, and efficient non-linear solvers.
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Reports on the topic "Dissolution and precipitation processes"

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Suitner, Niels. Data set on the dissolution experiments available. OceanNets, March 2023. http://dx.doi.org/10.3289/oceannets_d5.1.

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Abiotic laboratory-based experiments were undertaken to determine the characteristics of mineral dissolution in seawater and thereby examine the potential for ocean alkalinization applications. As part of the mesocosm campaigns on Gran Canaria 2021 (WP5.3) and Bergen 2022 (WP5.4) we contributed to the impact assessment of OAE by conducting labbased experiments, focused on the carbonate chemistry and the stability of alkalinity in TA enhanced seawater. Due to extensive precipitation of secondary Ca-carbonates during the dissolution experiments, the focus of WP5.1 changed from mineral dissolution experiments to describing and avoiding the process of runaway precipitation while studying the generation of alkalinity. Understanding when, why and how precipitation is triggered in an OAE context might be an essential factor to determine the potential as a negative emission technology. All data sets for the dissolution experiments, the precipitation process and critical thresholds are available for project members.
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John F. Schabron, Joseph F. Rovani, and Mark Sanderson. Heavy Oil Process Monitor: Automated On-Column Asphaltene Precipitation and Re-Dissolution. Office of Scientific and Technical Information (OSTI), March 2007. http://dx.doi.org/10.2172/909849.

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John F. Schabron, Joseph F. Rovani Jr, and Mark Sanderson. HEAVY OIL PROCESS MONITOR: AUTOMATED ON-COLUMN ASPHALTENE PRECIPITATION AND RE-DISSOLUTION. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/886851.

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Davis, P. L. A Summary of Criticality Safety of Tank 41 Salt Dissolution In-Tank Precipitation and Extended Sludge Process. Office of Scientific and Technical Information (OSTI), March 1997. http://dx.doi.org/10.2172/587053.

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Onishi, Y., H. C. Reid, and D. S. Trent. Dilution physics modeling: Dissolution/precipitation chemistry. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/109665.

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Light, W. B., P. L. Chambre, T. H. Pigford, and W. W. L. Lee. The effect of precipitation on contaminant dissolution and transport: Analytic solutions. Office of Scientific and Technical Information (OSTI), September 1988. http://dx.doi.org/10.2172/6017316.

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Liu, Jun, and David Hobbs. Dissolution, Precipitation, and Deposition of Aluminum- Containing Phases in Tank Wastes. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/833290.

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Barros, A. P., W. Petersen, and A. M. Wilson. Integrated Precipitation and Hydrology Experiment (IPHEx)/Orographic Precipitation Processes Study Field Campaign Report. Office of Scientific and Technical Information (OSTI), April 2016. http://dx.doi.org/10.2172/1248894.

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Zavarin, M., S. Roberts, B. Viani, G. Pawloski, and T. Rose. Nuclear Melt Glass Dissolution and Secondary Mineral Precipitation at 40 to 200C. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/15014339.

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Steefel, Carl I. A Pore Scale Evaluation of the Kinetics of Mineral Dissolution and Precipitation Reactions (EMSI). Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/896181.

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