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Letteratura scientifica selezionata sul tema "Minor elements"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 gennaio 2023

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Articoli di riviste sul tema "Minor elements"

Scardia, M., D. Ghiringhelli e H. Debehogne. "Orbital elements of Minor Planets". Astronomische Nachrichten: A Journal on all Fields of Astronomy 317, n. 1 (1996): 43–48. http://dx.doi.org/10.1002/asna.2113170113.

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YOKOKAWA, Chikao, Masumi FURUSHO e Hirokazu ODA. "Analyses of Minor Elements in Coals." Journal of the Fuel Society of Japan 70, n. 8 (1991): 833–37. http://dx.doi.org/10.3775/jie.70.8_833.

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Scardia, M., D. Ghiringhelli e H. Debehogne. "Preliminary orbital elements of minor Planets". Astronomische Nachrichten 316, n. 2 (1995): 125–29. http://dx.doi.org/10.1002/asna.2103160210.

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Scardia, M., D. Ghiringhelli e H. Debehogne. "Revised orbital elements of minor planets". Astronomische Nachrichten: A Journal on all Fields of Astronomy 314, n. 4 (1993): 307–13. http://dx.doi.org/10.1002/asna.2113140411.

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Sobolev, Nikolai V., Alla M. Logvinova, Dmitry A. Zedgenizov, Nikolai P. Pokhilenko, Dmitry V. Kuzmin e Alexander Sobolev. "Olivine inclusions in Siberian diamonds: high-precision approach to minor elements". European Journal of Mineralogy 20, n. 3 (29 maggio 2008): 305–15. http://dx.doi.org/10.1127/0935-1221/2008/0020-1829.

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Sablii, L. M. "USING OF Lemna minor FOR POLLUTED WATER TREATMENT FROM BIOGENIC ELEMENTS". Biotechnologia acta 12, n. 5 (ottobre 2019): 82–88. http://dx.doi.org/10.15407/biotech12.05.082.

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YAMAGUCHI, Katsunori, Mitsuru TANAHASHI, Fumitaka TSUKIHASHI, Hidenori NAGASAKI, Yasumasa HATTORI e Toshio OISHI. "Removal of Minor Elements in Copper Smelting". Shigen-to-Sozai 119, n. 10,11 (2003): 683–86. http://dx.doi.org/10.2473/shigentosozai.119.683.

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Fukunishi, H., K. Murata, S. Takeuchi e S. Kitazawa. "Ovarian fibromatosis with minor sex cord elements". Archives of Gynecology and Obstetrics 258, n. 4 (15 luglio 1996): 207–11. http://dx.doi.org/10.1007/s004040050125.

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Ibrahim, Kocher Jamal Ibrahim, Shaimaa Ahmed Qaisar Qaisar e Jasim Mohammed Salah Al-Saadi Al-Saadi. "Determination of toxic, trace and minor elements content in local Kurdish yoghurt samples". Journal of Zankoy Sulaimani - Part A 2ndInt.Conf.AGR, Special Issue (6 febbraio 2018): 301–6. http://dx.doi.org/10.17656/jzs.10676.

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Whitlow, Harry J., Liping Wang, Edouard Guibert e Christian Degrigny. "Investigations of minor elements in early aluminium artefacts". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 450 (luglio 2019): 291–93. http://dx.doi.org/10.1016/j.nimb.2018.08.019.

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Tesi sul tema "Minor elements"

Larouche, Pascal. "Minor elements in copper smelting and electrorefining". Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33978.

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Minor element (As, Sb, Bi, Pb, Ni) behavior, control and removal techniques in the conventional copper smelting/electrorefining process was studied. The analysis was based on the information collected from an exhaustive literature review, the visit of 23 smelters, 14 electrorefineries and consultations at 15 different institutes specialized in the field.
Data was collected for several types of matte smelting furnaces such as Outokumpu flash, INCO flash, Mitsubishi S-furnace, Teniente Converter, Noranda Process Reactor, Isasmelt and reverberatory. Behavior in Peirce-Smith converting furnaces, Mitsubishi C-furnace, Noranda Continuous Converter and Kennecott-Outokumpu Flash Converting Furnace was also discussed.
The effect of various matte smelting furnace operating parameters such as matte grade, oxygen enrichment, concentration in feed, other minor constituents and temperature on minor element partition to gas and distribution coefficient (wt% matte/wt% slag) was analyzed theoretically and validated with industrial data when possible. Because fewer data were available, only a brief comparison between the elimination in traditional batch converting and new continuous converting processes was performed. The behavior of minor elements in electrorefining was described from a theoretical viewpoint. (Abstract shortened by UMI.)

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Luganova-Chnyrenkova, Tatiana. "Factors affecting behaviour of minor elements in dore metal-soda slag partitioning". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26404.

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A series of experiments determined the influence of oxygen partial pressure and SiO$ sb2$ content in soda slag on the distribution of metals between soda slag and dore metal. Oxygen partial pressure ranged from 10$ sp{-8}$ to one atmosphere and the SiO$ sb2$ content from 0 to 10 wt%.
Minor elements, including the precious metals, partition between the dore metal and the soda slag. The main purpose of this research was to determine the process parameters which influence this distribution, and the nature and forms of the precious metals in the metal and in the slag phases.
From the results of the experiments it was found that: (a) Increasing oxygen partial pressure from 10$ sp{-8}$ to 1 atm does not influence gold, palladium and platinum removal from dore metal, but leads to the practically complete removal of Te (down to 4.8 ppm), Rh (down to 2.7 ppm), Pb (down to 6.0 ppm) and quite good removal of Se (down to 0.0112 wt%) and Cu (down to 0.42 wt%) from the dore metal. (b) Silica content of the soda slag does not influence gold, palladium and platinum chemical losses with soda slag. However it was found that increasing silica in slag leads to an increase of mechanical loss of precious metals because of the increase in slag viscosity. (c) Increase in silica content of slag increased lead and copper removal from dore metal, and decreased the removal of rhodium, selenium and tellurium, especially at low oxygen potential. (d) It was concluded that most of precious metals leave dore metal in the form of mechanical losses, but silver and rhodium were found in slags as intermetallic phases with the other components. Rhodium is also lost in the form of the volatile oxide RhO$ sb2$. (Abstract shortened by UMI.)

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Lee, Rena J. "Study of trace and minor elements in ALS (amyotrophic lateral sclerosis) patients". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36492.

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Du, Toit Adam Jacobus. "Thermodynamic behaviour of sulphur and chlorine as minor elements in metallurgical melts". Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5379.

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Includes bibliographical references (p. 137-147)
This thesis is presented on the equilibrium studies that have been carried out on a series of slags, specifically chosen to cover the range of composition and conditions appropriate to the melters of the platinum group metals (PGM) producers of South Africa. New measurements have been made on the ferric to ferrous ration, sulphide capacity as well as the chloride capacity mainly for the PGM melter-type slags.

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Cao, Qianwen. "Mass Balance of Major, Minor and Trace Elements During AFBC Combustion of Fuels". TopSCHOLAR®, 1997. http://digitalcommons.wku.edu/theses/899.

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The proposed ASTM procedures for the determination of 13 major and minor., and 11 trace elements, in solid coal and coke combustion residues by inductively coupled plasma-atomic emission spectrometry (ICP-AES) were checked for routine use. In this study, the ICP analysis values and XRF analysis values of major and minor elements in two kinds of coal and two kinds of limestone were compared. It was shown that over 95% closure of the mass balances of the 24 major, minor, and trace elements was obtained with the proposed ASTM procedure. Also, it was demonstrated that trace elements may be lost through combustion. From six combustion runs, the composition of the fly ashes produced in the FBC burns was determined by XRF analysis. The total carbon, inorganic carbon, and unburned carbon in the fly ashes were also determined. The combustion efficiency of the AFBC system was calculated by comparing the carbonto-iron ratios in the unburned fuel to that in the fly ashes.

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COSTA, ISOLDA. "Effect of minor addition elements on the corrosion behaviour of bare and coated steels". reponame:Repositório Institucional do IPEN, 1991. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10281.

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Tese (Doutoramento)
IPEN/T
University of Manchester, England

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Anttila, S. (Severi). "Influence of minor elements on some weldability issues of intermediate purity stabilized ferritic stainless steels". Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526219738.

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Abstract Stabilized ferritic stainless steel grades are attractive alternatives to common austenitic grades in sheet metal applications. Compared with older unstabilized ferritic grades, the mechanical and corrosion properties are usually improved. The impurity level, mainly the amount of interstitial carbon and nitrogen, plays an important role in these steels. There are notable issues in the welding of these steels, the most apparent difference to austenitic steels is the susceptibility to brittle failure. This research focused on the influence of minor elements, especially aluminium, calcium, silicon, titanium, niobium, nitrogen and oxygen, on the weldability of modern intermediate purity level stabilized ferritic stainless steels. The research proceeded in several stages. At first, the general characteristics and performance data about the welds in currently manufactured 11 to 21 mass percent chromium ferritic stainless steels in Europe was obtained. The research then focused on novel high chromium stabilized ferritic stainless steels. Lastly, the influence of various steelmaking practices on weldability were investigated. The results showed that in stabilized ferritic stainless steels, slag islands are frequently seen in the molten weld pools. These islands can have many origins, e.g. deoxidation, calcium treatment and stabilization practices, and they can be roughly assessed from the chemical composition of the steel. The nature and the influence of these slags varies and can be related to irregularities in the weldability and molten metal fluid flow. Large grain size and titanium carbonitride particles impair the toughness of the heat-affected zone. Generally, stabilization with niobium is preferred. However, solely niobium stabilized steel welds run the risk of forming coarse columnar grains in welds deteriorating some of the properties. A breakdown of the columnar grains is possible to achieve in autogenous welds with minor titanium and aluminium alloying, provided that small amounts of nitrogen and oxygen are induced from the shielding gas. However, grain refinement may not improve the properties, if it is accomplished with an increase in the total interstitial content
Tiivistelmä Stabiloidut ferriittiset ruostumattomat teräkset soveltuvat korvaamaan tavanomaisia austeniittisia ruostumattomia teräksiä ohutlevysovelluksissa. Näillä teräksillä keskeiset mekaaniset ja korroosio-ominaisuudet ovat usein paremmat kuin varhaisilla, stabiloimattomilla ferriittisillä teräksillä. Hiili ja typpi ovat näissä teräksissä kuitenkin epäpuhtauksia. Toisin kuin austeniittiset teräkset, ferriittiset teräkset ovat alttiita haurasmurtumalle, erityisesti hitsatuissa rakenteissa. Tässä väitöstutkimuksessa keskityttiin mikroseosaineiden ja epäpuhtauksien vaikutukseen keskipuhtaiden stabiloitujen ferriittisten teräslajien hitsauksessa. Tutkimus kohdistui erityisesti alumiinin, kalsiumin, piin, titaanin, niobin, typen ja hapen vaikutuksiin. Aluksi tutkittiin kaupallisten terästen hitsien keskeisiä ominaisuuksia. Tämän jälkeen tutkittiin uusia ns. korkeakromisia stabiloituja ferriittisiä teräslajeja. Lopuksi tutkittiin teräksen valmistuksen vaikutuksia stabiloitujen ferriittisten ruostumattomien terästen hitsattavuuteen. Tutkituilla teräksillä hitsauksen aikana muodostui runsaasti kuonalauttoja. Näillä kuonilla on monta alkuperää, esim. deoksidointi, kalsiumkäsittely ja stabilointiaineet. Hitsien kuonaisuutta voidaan karkeasti arvioida teräksen kemiallisen koostumuksen perusteella. Muodostuvilla kuonilla on useita vaikutuksia hitsauksessa, mm. epäjatkuvuuksiin ja sulan virtauksiin. Hitsauksessa muodostuva suuri raekoko ja stabiloinnin titaanikarbonitridipartikkelit heikentävät oleellisesti hitsin muutosvyöhykkeen sitkeyttä. Stabilointi käyttäen pääasiassa niobia on toivottavaa, mutta jos stabilointiin käytetään vain niobia, tulee hitsin mikrorakenteesta karkea ja hitsin ominaisuudet voivat heikentyä. Karkean mikrorakenteen hienontaminen on mahdollista käyttäen suojakaasuna argonia, jossa on hieman typpeä ja happea, mikäli teräkseen on seostettu hieman alumiinia ja titaania. Raerakenteen hienontaminen ei kuitenkaan yksiselitteisesti paranna hitsin ominaisuuksia, mikäli hienontaminen saavutetaan kasvattamalla epäpuhtauspitoisuutta tarpeettoman korkeaksi

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Stewart, Andrew John. "Planetary cores : effect and behaviour of minor elements on the Fe-S system to 40 GPa /". Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16815.

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Laban, Kay. "The development and application of methods for investigating the distribution of minor and trace elements in coal". Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287238.

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Chi, Xiaoliu. "Development of Methods for the Determination of Major and Minor Elements and Hydrocarbon Residues in Solid Combustion Products". TopSCHOLAR®, 1997. http://digitalcommons.wku.edu/theses/772.

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Methods for the determination of inorganic constituents in coal fly ash by glow discharge spectrometry (GDS) and for the extraction of the organic compounds from coal and ash by supercritical fluid extraction (SFE) at temperatures below 150°C are reviewed. The inorganic elements studied included Al, Ca, C, Cu, Fe, Mg, Mn, P, S, Si and Ti. The organic compounds were measured by weight loss of the sample. The goal of this research was to find easier and faster ways to measure the concentration of inorganic elements in coal ash and to measure extractability of the coal itself, to make coal conversion and utilization more efficient and convenient. The results of this research indicated that for inorganic element determination, graphite can be used as the host material to make the coal ash pellets. When 90% graphite and 10% ash were mixed together and compressed under 20 tons of pressure, the pellets had suitable conductivity and mechanical strength, and the calibration curves for most of the elements were linear, especially for Al and Si. Copper was also used as the host material. In copper pellets the intensities of all elements were much larger than those in graphite, indicating that copper is more promising for pellet preparation. For supercritical fluid extraction, temperature is an important factor for extraction efficiency. The pressure and kinds of modifiers used were also important for extraction. The weight loss by supercritical fluid extraction of coal was much smaller than by soxhlet extraction, indicating that it is difficult to extract organic compounds from coal by SFE at temperatures below 150°C.

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Libri sul tema "Minor elements"

Eddy, B. T. The determination of minor and trace elements in activated charcoal. Randburg, South Africa: Council for Mineral Technology, 1988.

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Piper, David Z. Geochemistry of minor elements in the Monterey Formation, California: Seawater chemistry of deposition. Washington, D.C: U.S. Geological Survey, 1995.

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Organization, World Health, e International Atomic Energy Agency, a cura di. Minor and trace elements in breast milk: Report of a joint WHO/IAEA collaborative study. Geneva: World Health Organization, 1989.

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Leventhal, Joel S. Geochemistry of minor and trace elements of 22 core samples from the Monterey Formation and related rocks in the Santa Maria Basin, California. [Washington, D.C.]: U.S. G.P.O., 1989.

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Ihnat, M. Concentrations and variability of major, minor and trace elements in soils and crops from two Humic gleysol fields in southeastern Ontario, Canada. Ottawa, Ont: Research Branch, Agriculture and Agri-Food Canada, 1996.

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N, Anoshin G., a cura di. Rare earth elements in ultramafic and mafic rocks and their minerals: Minor and accessory minerals. London: Taylor & Francis, 2012.

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Lammer, M. Fission product yield data for the transmutation of minor actinide nuclear waste. Vienna: International Atomic Energy Agency, 2008.

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Evans, James George. Distribution of minor elements in the Rodeo Creek NE and Welches Canyon quadrangles, Eureka County, Nevada. Washington: U.S. G.P.O., 1986.

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Fisher, G. T. Solubility of lead and distribution of minor elements between bullion and calcium ferrite slag at 1,250⁰C. Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, 1991.

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Fisher, G. T. Solubility of lead and distribution of minor elements between bullion and calcium ferrite at 1,250 p0 sC. Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, 1991.

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Capitoli di libri sul tema "Minor elements"

Tedesco, Steven A. "Major and Minor Elements". In Surface Geochemistry in Petroleum Exploration, 113–31. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2660-5_8.

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Finkelman, Robert B. "Trace and Minor Elements in Coal". In Topics in Geobiology, 593–607. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2890-6_28.

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Robles Hernandez, Francisco C., Jose Martin Herrera Ramírez e Robert Mackay. "Al-Si Alloys, Minor, Major, and Impurity Elements". In Al-Si Alloys, 1–15. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58380-8_1.

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Sakata, Yusuke. "Influence of Minor Elements in Waste Lead Battery Recycling". In The Minerals, Metals & Materials Series, 569–80. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37070-1_49.

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Joseph, Bernard. "Political Sovereignty —Community of Interests and Minor Elements of Nationality". In Nationality: Its Nature and Problems, 137–50. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003227953-9.

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Christensen, Leif Højslet, e Leif Rasmussen. "EDXRF Determination of Major and Minor Elements in Compound Fertilizers". In Advances in X-Ray Analysis, 215–20. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2471-3_32.

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Berg, Charles. "A Case Showing Minor Elements of Psychoneurotic, Psychopathic, Homosexual and Schizoid Trends". In Clinical Psychology, 48–58. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003251514-5.

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Al-Dousari, Ali, Fatin Al-Mutawaa, Hanan Al-Mansour e Badreya Mandekar. "Inductively Coupled Plasma (ICP)". In Atlas of Fallen Dust in Kuwait, 121–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66977-5_5.

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Abstract The crushed powder from defined dust particlesize fractions was analyzed using inductively coupled spectrometry plasma (ICP) for major and trace elements. The ICP was used for the determination of concentrations of trace elements and six major elements: (Al, Fe, Mg, Ca, Na, and K) and five minor elements (Ba, Cr, V, Ti, and Pb). They are quoted in part per million (ppm). Maps showing high and low concentrations of ICPamong Kuwait.

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Parr, R. M. "AN INTERNATIONAL COLLABORATIVE RESEARCH PROGRAMME ON MINOR AND TRACE ELEMENTS IN TOTAL DIETS". In Proceedings of the 4. International Workshop, Neuherberg, F. R. G., April 1986, a cura di Peter Brätter, 157–64. Berlin, Boston: De Gruyter, 1987. http://dx.doi.org/10.1515/9783111692449-013.

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Chabrier, G., L. Segretain, M. Hernanz, J. Isern e R. Mochkovitch. "Importance of the Crystallization of Minor Elements on the Cooling History of White Dwarfs". In White Dwarfs: Advances in Observation and Theory, 115–26. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2020-3_16.

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Atti di convegni sul tema "Minor elements"

Limbeck, Maggie, Julie Bartley, L. C. Kah e Colin Sumrall. "MINOR ELEMENT DISTRIBUTION IN SKELETAL ELEMENTS OF MODERN ECHINOID (ECHINODERMATA) GENERA". In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-382972.

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Jiang, Don-son, Yu-po Wang e C. S. Hsiao. "Effect of minor doping elements on lead free solder joint quality". In 2006 8th Electronics Packaging Technology Conference. IEEE, 2006. http://dx.doi.org/10.1109/eptc.2006.342747.

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Catrina, Gina Alina. "OPTIMISED METHOD FOR DETERMINATION OF MINOR ELEMENTS FROM ROMANIAN BIOMASS ASH". In 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019/4.1/s18.094.

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Shah, D. M., e D. N. Duhl. "Effect of Minor Elements on the Deformation Behavior of Nickel-Base Superalloys". In Superalloys. TMS, 1988. http://dx.doi.org/10.7449/1988/superalloys_1988_693_702.

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McCanta, Molly C., e John Beckett. "ZONING OF PHOSPHORUS AND OTHER MINOR ELEMENTS IN OLIVINE: AN EXPERIMENTAL STUDY". In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-303230.

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Guo, S., W. Sun, D. Lu e Z. HU. "Effect of Minor Elements on Microstructure and Mechanical Properties of In 718 Alloy". In Superalloys. TMS, 1997. http://dx.doi.org/10.7449/1997/superalloys_1997_521_530.

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Fischer, Emily S. C., Andrew P. Robertson e J. Brian Balta. "DISTRIBUTIONS AND ABUNDANCES OF MAJOR AND MINOR ELEMENTS IN BRECCIATED DIOGENITE MIL 11201". In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-337499.

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Park, S. W., J. L. Jo, T. Sugahara, M. Ueshima, H. Iwamoto e K. Suganuma. "SiC die-attachment with minor elements added pure Zn under formic acid reflow". In 2012 4th Electronic System-Integration Technology Conference (ESTC). IEEE, 2012. http://dx.doi.org/10.1109/estc.2012.6542163.

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Lemarchand, Damien, Thierry Perrone, René Boutin, Rémy Saint-Lys e Damien Daval. "Unexpected Fast and Massive Release of Minor and Trace Elements during Silicate/Water Interactions". In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1455.

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Näkki, Jonne, Jari Tuominen, Henri Pajukoski e Petri Vuoristo. "The effect of minor alloying elements of alloy 625 on the laser cladding process". In ICALEO® 2013: 32nd International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2013. http://dx.doi.org/10.2351/1.5062938.

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Rapporti di organizzazioni sul tema "Minor elements"

Guohui, L. Determination of fourteen major and minor elements in different geological materials by X-ray fluorescence. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193306.

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Dulski, P., e J. Luck. Determination of minor and trace elements in four Canadian iron-formation standard samples FeR-1, FeR-2, FeR-3, and FeR-4 by INAA, ICP-MS, and ICP-AES. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193240.

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Janney, Dawn E., e Cynthia Papesch. Metallic Fuels Handbook, Part 1: Alloys Based on U-Zr, Pu-Zr, U-Pu, or U-Pu-Zr, Including Those with Minor Actinides (Np, Am, Cm), Rare-earth Elements (La, Ce, Pr, Nd, Gd), and Y; and Part 2: Elements and Alloys not Based on U-Zr, Pu-Zr, U-Pu, or U-Pu-Zr. Office of Scientific and Technical Information (OSTI), agosto 2017. http://dx.doi.org/10.2172/1504934.

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Harris, D. C., e D. F. Sangster. Minor element content of sphalerite, Nanisivik lead-ainc deposit, NWT. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/133338.

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Desbarats, A. J., e J. B. Percival. Hydrogeochemistry of mine tailings from a carbonatite-hosted Nb-REE deposit, Oka, Quebec, Canada. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331256.

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Abstract (sommario):

Environmental impacts associated with the mining of carbonatite deposits are an emerging concern due to the demand for critical metals. This study investigates the chemistry of tailings seepage at the former Saint Lawrence Columbium mine near Oka, Québec, Canada, which produced pyrochlore concentrate and ferroniobium from a carbonatite-hosted Nb-REE deposit. Its objectives are to characterize the mineralogy of the tailings and their pore water and effluent chemistries. Geochemical mass balance modeling, constrained by aqueous speciation modeling and mineralogy, is then used to identify reactions controlling the chemical evolution of pore water along its flow path through the tailings impoundment. The tailings are composed mainly of REE-enriched calcite (82 wt. %), biotite (12 wt. %) and fluorapatite (4 wt. %). Minor minerals include chlorite, pyrite, sphalerite, molybdenite and unrecovered pyrochlore. Secondary minerals include gypsum, barite and strontianite. Within the unsaturated zone, pore water chemistry is controlled by sulfide oxidation and calcite dissolution with acid neutralization. With increasing depth below the water table, pore water composition reflects gypsum dissolution followed by sulfate reduction and FeS precipitation driven by the oxidation of organic carbon in the tailings. Concomitantly, incongruent dissolution of biotite and chlorite releases K, Mg, Fe, Mn, Ba and F, forming kaolinite and Ca-smectite. Cation exchange reactions further remove Ca from solution, increasing concentrations of Na and K. Fluoride concentrations reach 23 mg/L and 8 mg/L in tailings pore water and effluent, respectively. At a pH of 8.3, Mo is highly mobile and reaches an average concentration of 83 µg/L in tailings effluent. Although U also forms mobile complexes, concentrations do not exceed 16 µg/L due to the low solubility of its pyrochlore host. Adsorption and the low solubility of pyrochlore limit concentrations of Nb to less than 49 µg/L. Cerium, from calcite dissolution, is strongly adsorbed although it reaches concentrations (unfiltered) in excess of 1 mg/L and 100 µg/L in pore water and effluent, respectively. Mine tailings from carbonatite deposits are enriched in a variety of incompatible elements with mineral hosts of varying reactivity. Some of these elements, such as F and Mo, may represent contaminants of concern because of their mobility in alkaline tailings waters.

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King, R. D., S. J. Piercey, R. C. Paulen e J. A. Petrus. Major-, minor-, and trace-element geochemistry of sulphide indicator minerals from surficial sediments, southwestern Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/314688.

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Werdon, M. B., D. J. Szumigala, R. J. Newberry, J. C. Grady e W. C. Munly. Major oxide, minor oxide, trace element, rare-earth element, and geochemical data from rocks collected in Eagle and Tanacross quadrangles, Alaska in 2000. Alaska Division of Geological & Geophysical Surveys, 2000. http://dx.doi.org/10.14509/2729.

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Dyck, W., e R. T. Bell. Uranium and other trace and minor element concentrations in surface rocks and stream sediments from the Cypress Hills, Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120224.

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Werdon, M. B., R. J. Newberry, J. E. Athey, D. J. Szumigala, L. K. Freeman, R. R. Lessard, K. R. Hendry e M. A. Wiltse. Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in the Big Delta Quadrangle, Alaska in 2002. Alaska Division of Geological & Geophysical Surveys, dicembre 2003. http://dx.doi.org/10.14509/2997.

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Athey, J. E., M. B. Werdon, D. J. Szumigala, R. J. Newberry e M. R. Johnson. Major oxide, minor oxide, trace element, and geochemical data from the rocks collected in the Big Delta Quadrangle, Alaska in 2001. Alaska Division of Geological & Geophysical Surveys, giugno 2002. http://dx.doi.org/10.14509/2857.

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