Relevant bibliographies by topics / Gibbsite Scale

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Academic literature on the topic 'Gibbsite Scale'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Gibbsite Scale"

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Golubev, Vladimir, and Tatyana Litvinova. "Dynamic simulation of industrial-scale gibbsite crystallization circuit." Journal of Mining Institute 247 (March 16, 2021): 88–101. http://dx.doi.org/10.31897/pmi.2021.1.10.

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Population balance model is crucial for improving the method of aluminum hydroxide massive crystallization and enhancing the quality of control over industrial precipitation trains. This paper presents the updated population balance model, which can be used for simulation of industrial-scale precipitation. Processes of birth-and-spread and particle breakage are considered integral parts of the precipitation process along with secondary nucleation, growth and agglomeration of particles. The conceptual difference of the proposed system of equations is its ability to reproduce the oscillatory process that occurs in precipitation circuits as a result of cyclic changes in the quality of the seed surface. It is demonstrated that self-oscillations can occur in the system without any external influence. The updated model is adjusted and verified using historical industrial data. The simulation of seed-recycle precipitation circuit showed an exact correspondence between the calculated dynamic pattern of changes in particle size distribution of aluminum hydroxide and the actual data.
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Bekker, A. V., T. S. Li, and I. Livk. "Dynamic response of a plant-scale gibbsite precipitation circuit." Hydrometallurgy 170 (July 2017): 24–33. http://dx.doi.org/10.1016/j.hydromet.2016.06.002.

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Webster, Nathan A. S., Ian C. Madsen, Melissa J. Loan, et al. "An investigation of goethite-seeded Al(OH)3precipitation usingin situX-ray diffraction and Rietveld-based quantitative phase analysis." Journal of Applied Crystallography 43, no. 3 (2010): 466–72. http://dx.doi.org/10.1107/s0021889810008484.

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Anin situX-ray diffraction investigation of goethite-seeded Al(OH)3precipitation from synthetic Bayer liquor at 343 K has been performed. The presence of iron oxides and oxyhydroxides in the Bayer process has implications for alumina reversion, which causes significant process losses through unwanted gibbsite precipitation, and is also relevant for the nucleation and growth of scale on mild steel process equipment. The gibbsite, bayerite and nordstrandite polymorphs of Al(OH)3precipitated from the liquor; gibbsite appeared to precipitate first, with subsequent formation of bayerite and nordstrandite. A Rietveld-based approach to quantitative phase analysis was implemented for the determination of absolute phase abundances as a function of time, from which kinetic information for the formation of the Al(OH)3phases was determined.
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Hai, Chunxi, Yuan Zhou, Lijuan Zhang, et al. "Large-scale synthesis of uniformly dispersed hexagram-like gibbsite by a controlled replacement reaction." CrystEngComm 19, no. 27 (2017): 3850–55. http://dx.doi.org/10.1039/c7ce00822h.

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A facile, convenient and mild method has been developed for synthesis of uniformly dispersed 2D six-pointed star-like gibbsite micro-nano crystals with lateral size around 2.5 μm and thickness around 100 nm.
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Enright, E., T. Curtin, J. Haines, and K. T. Stanton. "The influence of surface roughness on gibbsite scale development on steel." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 226, no. 1 (2011): 61–71. http://dx.doi.org/10.1177/1464420711421269.

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Fernandes, Kathleen, José Marques Júnior, Angélica Santos Rabelo de Souza Bahia, José A. M. Demattê, and Adriana Aparecida Ribon. "Landscape-scale spatial variability of kaolinite-gibbsite ratio in tropical soils detected by diffuse reflectance spectroscopy." CATENA 195 (December 2020): 104795. http://dx.doi.org/10.1016/j.catena.2020.104795.

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Kiani, Sajad, Abdolreza Samimi та Alimorad Rashidi. "Novel one-pot dry method for large-scale production of nano γ-Al2O3 from gibbsite under dry conditions". Monatshefte für Chemie - Chemical Monthly 147, № 7 (2016): 1153–59. http://dx.doi.org/10.1007/s00706-015-1642-1.

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Reatto, Adriana, Ary Bruand, Eder de Souza Martins, et al. "Variation of the kaolinite and gibbsite content at regional and local scale in Latosols of the Brazilian Central Plateau." Comptes Rendus Geoscience 340, no. 11 (2008): 741–48. http://dx.doi.org/10.1016/j.crte.2008.07.006.

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Dong, Jie Ji, Guang Wang, Mao Fang Zuo, Hua Li, and Qing Guo Xue. "Characteristics of the Sierra Leone High Alumina Iron Ore and Utilization in Sintering." Advanced Materials Research 881-883 (January 2014): 1515–21. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1515.

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The characteristics of the Sierra Leone iron ore were studied at laboratory scale by chemical analysis, XRD, SEM-EDS and TG-DSC methods. The Sierra Leone iron ore was a kind of limonite, which was mainly consisted of hematite, goethite and gibbsite. The iron ore lost its crystal water at a fast speed ranging from 200°C to 400°C and the total content of the crystal water was about 8.2 wt.%. The initial melt formation temperature of the iron ore with CaO was stably kept at around 1209°C and the amount of liquid increased with the increasing of CaO content. Its melt formation temperature is higher than Australian limonite. The sintering pot test showed that the yield of sinter decreases from 78.37wt.% to 73.36wt.% and the drum index decreases from 60.5wt.% to 49.63wt.% when the blending ratio of Sierra Leone iron ore increases from 7wt.% to 27.3wt.%.
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Aristide Zé, Parfait, Cornelius Tsamo, and Richard Kamga. "Characterization of Minim-Martap Bauxite and Its Extracted Alumina." Journal of Advanced Chemical Sciences 4, no. 4 (2018): 598–600. http://dx.doi.org/10.30799/jacs.198.18040402.

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Due to their chemical and mineralogical properties bauxites are composites with multiple applications. In this work, the properties of bauxite collected from Minim-Martap and its extracted alumina were evaluated. Alumina was extracted by adapting the Bayer process at laboratory scale while the characteristics of bauxite and alumina were variably characterized by determining the particle size distribution, relative humidity, loss on ignition, pH, EC, CEC, PZC, XRD, IR, and DSC-TGA. These results show that Minim-Martap bauxite gray bauxite with easily extractable alumina. This bauxite is acidic with a pH of 6.05, PZC of 6.91 and CEC of 15 Meq/100 g which is closer to that of kaolinite clays. This result was confirm by XRD which shows two types of kaolinites: Al2Si2O5(OH)4 with 83.24% and H4Al2Si2O9 with 42.47%, mullite Al2.25Si0.75O4.875 with 67.32%, gibbsite (H2SiO4) with 83.92%. The bauxite is hydroscopic as evident from its humidity results. The IR spectroscopy of bauxite and alumina shows the presence of Al-OH and Si-OH which increase with acid treatment. Minim-martap bauxite and its extracted alumina can be used as raw materials for many industrial processes because of the different properties they possess as revealed by this study.
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Dissertations / Theses on the topic "Gibbsite Scale"

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Tabassum, Rasheed, and tabassum rasheed@svt com au. "Scale growth study in a concentric reducer: Measurement of instantaneous velocity using Particle Image Velocimetry." Central Queensland University. School of Advance Technology and Processes, 2005. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060720.095421.

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Gibbsite scale growth in pipe fittings is a major problem for an alumina refinery. A recent investigation into the scale growth mechanism at an alumina refinery found almost 60 % more scale growth in a reducer when compared with the connecting straight pipe sections for similar flow conditions. Scale growth occurs where liquor (supersaturated solutions) come in contact with solid surfaces and it is affected by the liquor flow velocity besides other physical and chemical parameters. The present work is dedicated to study the hydro-dynamical aspects of the mechanism of scale growth. In particular, the role of the phenomenon of turbulent bursting, stream wise and cross stream fluctuating velocity components (Ux and Uy) was investigated as the flow moves through the reducer. Particle Image Velocimetry (PIV) technique was used to get a full view of the reducer and the readings close-to-the-wall of the reducer at Reynolds number of 27,000 and 44,000 upstream which corresponds to Reynolds number of 41,500 and 66,000 downstream of the reducer respectively. The results showed an increase in cross stream and a decrease in magnitude of stream wise fluctuating velocity components, whereby we presume that the increased cross stream fluctuating velocity component increases the frequency of impacts of the scaling particles on the wall thus initiating excessive scale growth in the reducer when compared with the connecting straight pipe sections, for similar flow conditions.
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Tseng, Meng-Shen, and 曾孟慎. "Synthesis of nano-scaled gibbsite platelets under hydrothermal conditions." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/03746958051676663667.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>94<br>Traditionally, gibbsite (Al(OH)3) is the most important raw material for producing alumina powders in industry. Moreover, it has more advanced applications in composite materials and higher price when the particle size was reduced and the plate-like shape was possessed. It is going to be higher level application and higher unit price powders if the low-cost ways that can manufacture gibbsite platelets with particle size thinner than the submicron-scaled commercial powders. In this study, χ-Al2O3 was used as raw material to synthesis nano-scaled gibbsite platelets by hydrothermal treatment. Four kinds of χ-Al2O3 slurries with different particle size were obtain by different fining treatments: stirring, ball milling, pearl milling, and pearl milling + centrifuge treatment. After dilution, χ-Al2O3 slurries with pH~4.5 and solid contain 1 wt% were obtained as the starting materials. And then, gibbsite crystallites were synthesized under hydrothermal conditions at 100℃. The relationship among the formation of gibbsite crystallites, particle size of the raw materials and duration of the hydrothermal treatment were discussed. Further, the particle size and shape of the produced powders were investigated and the synthesized mechanism was tried to find out. The results showed that: (1) The formation of gibbsite crystallites tended to increase with the reduction of the particle size of starting materials, and it was mainly dominated by the amount of theχ-Al2O3 crystallites with small particle size (＜200 nm). The formation of gibbsite crystallites showed a exponential increase with the durations of the hydrothermal treatment. (2) Under the hydrothermal treatments, the mechanism of gibbsite crystallites synthesis from χ-Al2O3 is similar to the mechanism of dissolution-precipitation. (3) Mono-dispersed and well crystallized gibbsite crystallites with mean crystallite size 31 nm calculate from the (002) XRD reflection by Scherrer formula can be synthesized in this study. From the investigations of TEM and SEM micrographs, the synthesized gibbsite powders possess plate-like shape and whose crystallite size in diameter and in thickness are 300～600 nm and about 50 nm, respectively.
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Book chapters on the topic "Gibbsite Scale"

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Juo, Anthony S. R., and Kathrin Franzluebbers. "Properties and Management of Oxidic Soils." In Tropical Soils. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195115987.003.0015.

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Oxidic soils are deeply weathered, fine-textured, oxide-rich soils in the tropics. These soils are the second most abundant soils in the tropics. Geographically, oxidic soils are found in Latin America (Brazil, Central America), East and Central Africa (Kenya, Congo, and Cameroon), the Caribbean Basin, and the Pacific Islands. In southeastern Asia, oxidic soils are found in isolated areas of Indonesia, the Philippines, and northern Australia, usually on the volcanic and limestone-dominated geomorphic surfaces. Oxidic soils are oxide-rich, low bulk density Oxisols, Alfisols, and Ultisols according to the Soil Taxonomy classification. In other soil classification schemes, most oxidic soils are classified under Sols Ferallitiques according to the French system, and Ferralsols and Nitosols under the FAO/UNESCO system. Oxidic soils are differentiated into high-base-status and low-base-status soils on the basis of the 70% base saturation limit calculated from effective CEC. The high-base-status oxidic soils generally are enriched with Ca-saturated organic matter in the surface layer and are among the more productive upland soils in the tropics. The low-base-status oxidic soils are acidic, have a low effective CEC, and the degree of exchangeable Al saturation often exceeds 60% in the subsoil horizons. Because of their excellent soil physical properties, oxidic soils are more resistant to soil erosion and therefore better suited to large-scale mechanized agriculture than kaolinitic soils. Although the dominant clay mineral is kaolinite, the presence of moderate amounts of crystalline and amorphous Fe and Al oxides and hydrous oxides (around 5% Fe2O3 or higher) with a high specific surface area (100 m2/g or larger) gives rise to many unique chemical and physical properties, such as a variable surface charge, the formation of microaggregates, low bulk density (0.8-1.2 Mg/ m3), stable soil structure, and high permeability. Most oxidic soils are red or dark red due to the presence of clay-size hematite (Fe2O3) in the soil. The yellowish oxidic soils contain primarily goethite (FeOOH) in the clay fraction and occur in the wetter geomorphic positions of a deeply weathered landscape. Extensive areas of clayey, yellowish oxidic soils are found in the Amazon Basin. Gibbsite (A1OOH) is the major crystalline Al oxide.
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