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Fernandez Cellini, R.; Batuecas Rodriguez, T.; Vera Palomino, J.
Junta de Energia Nuclear (JEN), Madrid (Spain)1956
Junta de Energia Nuclear (JEN), Madrid (Spain)1956
AbstractAbstract
No abstract available
Original Title
Estudio de minerales radiactivos espanoles.- I.- Fosfatos dobles de uranio-calcio y de uranio-cobre de Venta de Cardena (Cordoba)
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1956; 24 p
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Linguanotto, Edmilso; Rocha, Eronaldo Bomfim
Proceedings of the 48. Annual meeting of the Brazilian Society for the Advancement of Science. v. 2: Communications1996
Proceedings of the 48. Annual meeting of the Brazilian Society for the Advancement of Science. v. 2: Communications1996
AbstractAbstract
No abstract available
Original Title
Estudo de anomalia radiometricas de superficie atraves de levantamento gama-espectrometrico terrestre
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Secondary Subject
Source
Sociedade Brasileira para o Progresso da Ciencia (SBPC), Sao Paulo, SP (Brazil); Pontificia Univ. Catolica de Sao Paulo, SP (Brazil); 570 p; 1996; p. 539-540; 48. Annual meeting of the Brazilian Society for the Advancement of Science; 48. Reuniao anual da SBPC. Ciencia para o progresso da sociedade brasileira; Sao Paulo, SP (Brazil); 7-13 Jul 1996; Available from the Library of the Brazilian Nuclear Energy Commission, Rio de Janeiro
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AbstractAbstract
No abstract available
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Maurice, Y.T. (ed.); Geological Survey of Canada, Ottawa, Ontario; 183 p; 1982; p. 169-170; Uranium in granites workshop; Ottawa, Ontario (Canada); 25-26 Nov 1980; Abstract only.
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AbstractAbstract
[en] Helium isotopes have been measured in fluorite and sulphides in order to obtain conclusive means of assessing the involvement of mantle and crustally derived volatiles in F-Ba deposits from Asturias (N of Spain). Fluorite mineralizations are hosted in Mesozoic (Permotriassic) and Paleozoic age rocks. Mineralization is composed of fluorite, barite, calcite, dolomite, quartz and sulphides, and shares the characteristics of most Mississippi Valley Type (MVT) deposits associated with rifting events related to the opening of the Atlantic Ocean. The 3He/4He values of the Asturias ore fluids (≤ 0,1 Ra) indicate a crustal fluid source and exclude the involvement of a mantle helium component. These values are consistent with the acceptance of the existing basinal model for MVT genesis and sedimentary brines migration, with the lack of igneous activity in the area contemporary with the mineralization, and also consistent with similar helium isotope data recorded in other fluorite deposits in Europe. (Author) 24 refs.
Original Title
Contribucion de los isotopos de He al origen de los fluidos hidrotermales: aplicacion al estudio de las mineralizaciones de fluorita de Asturias (N de Espana) (Author) 24 refs.
Primary Subject
Source
Available http://estudiosgeol.revistas.csic.es
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Journal Article
Journal
Estudios Geologicos (Madrid); CODEN EGLMA9; v. 66(1); p. 75-82
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AbstractAbstract
No abstract available
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Short note, 6 refs.
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Rojas Conopan, Felipe Ignacio
Universidad de Santiago de Chile. Facultad de Ingenieria. Departamento de Ingenieria Metalurgica (Chile)2018
Universidad de Santiago de Chile. Facultad de Ingenieria. Departamento de Ingenieria Metalurgica (Chile)2018
AbstractAbstract
[en] The great evolution of the technology development given in the last decade is undoubtedly due to the use of Rare Earth Elements (REE). They directly modify both physical and chemical properties in materials. An example of this is the progress in smart and high-resolution technologies, such as cell phones, computer hard drives, hybrid and electric vehicles, and LED monitors and lighting, as well as the attractive economic value that rare earth oxides possess in the world market. The Chilean Nuclear Energy Commission (CCHEN), together with the National Mining Company (ENAMI), began geological and metallurgical research. These studies allowed them to identify a prospect in the Atacama Region for studies that justify the technical and economic feasibility in the exploitation of a rare earth deposit as a new mining alternative. These previously conducted studies allowed to understand the fundamental parameters in the REE concentration for a Davidite ore. These studies reached a 60% recovery of REE at sulfuric concentration of 5M for temperatures between 90 to 100oC and a particle size less than 44 microns, with agitation being the only non-predominant parameter for this study. The purpose of this work is to increase the recovery of those elements that belong to the davidite ore, to obtain a leaching product with REE recoveries values greater than the previous studies, and reducing the concentration of the ions that affect negatively from post leaching processes. To validate this theory, the tests increased the leaching recovery of the impurity elements in the ore, especially iron, using two different methodologies. The first method incorporated NaCl into an H2SO4 leaching solution to increase the acid generation in the reaction, in order to enhance the dissolution of REE in leaching. This procedure showed that the increase in acid in the system over 2M and for NaCl concentration ranges between 0.5 to 1M, obtained recoveries over 60% REE. The second method included a reductive leaching in a H2SO4 leaching solution and the constant injection of sulphurous anhydride. This process dissolved the iron contained in the ore, and reduced it to its lower ionic state (ferrous ion). This addition allowed obtaining a recovery of 30% iron and fulfilling the purpose of the methodology, since the reaction potential in the system was over 600 mV, a range in which the ferrous ion is stable
Original Title
Estudio de lixiviacion acida de elementos de tierras raras a partir de un mineral de Davidita
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2018; 47 p; Available from Library of CCHEN; 13 refs., 7 figs., 1 tab; Thesis (Ingeniero de Ejecucion en Metalurgia)
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Miscellaneous
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Thesis/Dissertation
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AbstractAbstract
No abstract available
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Source
Roman, Ronald J. (comp.); p. 1-2; 1971; New Mexico State Bureau of Mines and Mineral Resources; Socorro, N. Mex; American Institute of Mechanical Engineering uranium symposium; Socorro, N. Mex; 6 May 1970
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Book
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Rajagopalan, V.; Paul, A.K., E-mail: vrajagopalan_2000@yahoo.com
Proceedings of international conference on peaceful uses of atomic energy - 2009. V. 12009
Proceedings of international conference on peaceful uses of atomic energy - 2009. V. 12009
AbstractAbstract
[en] The occurrence, dispersion and concentration of U, Th with REE in favourable litho-structural geo-domains, are constrained by the geo-genetic nature of primary U and Th minerals in the host rock. The paper includes the use of a non-destructive analytical mineralogy technique, the Electron Probe Micro-analysis (EPMA), in complete in-situ minerlo-chemical analysis based geo-genetic finger printing of discrete primary U- and Th-minerals with REE, viz. uraninite, pitchblende, coffinite, brannerite, U-thorite, thorite and monazite (LREE + Th phosphate) that occurs in diverse rocks and along the coast of India respectively. (author)
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Source
Reddy, A.V.R. (ed.) (Analytical Chemistry Div., Bhabha Atomic Research Centre, Mumbai (India)); Venugopal, V. (ed.) (Radiochemistry and Isotope Group, Bhabha Atomic Research Centre, Mumbai (India)); Sinha, R.K. (ed.) (Reactor Design and Development Group, Bhabha Atomic Research Centre, Mumbai (India)); Banerjee, S. (ed.) (Bhabha Atomic Research Centre, Mumbai (India)); Department of Atomic Energy, Mumbai (India); International Atomic Energy Agency, Vienna (International Atomic Energy Agency (IAEA)); Indian Nuclear Society, Mumbai (India); 408 p; 2009; p. 130-131; International conference on peaceful uses of atomic energy - 2009; New Delhi (India); 29 Sep - 1 Oct 2009; 2 refs., 1 tab.
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Book
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Farmer, Karilyn
International Symposium on Uranium Raw Material for the Nuclear Fuel Cycle: Exploration, Mining, Production, Supply and Demand, Economics and Environmental Issues. Presentations2014
International Symposium on Uranium Raw Material for the Nuclear Fuel Cycle: Exploration, Mining, Production, Supply and Demand, Economics and Environmental Issues. Presentations2014
AbstractAbstract
[en] The mining industry is a vital contributor to national and global economies. It is a truly international business that depends on the trust and confidence of investors and other stakeholders for its financial and operational well-being. Unlike many other industries, it is based on depleting mineral assets, the knowledge of which is imperfect prior to the commencement of extraction. It is therefore essential that the industry communicates the risks associated with investment effectively and transparently in order to earn the level of trust necessary to underpin its activities. Enforceable mineral resource and mineral (Ore) reserves codes are critical to earning this confidence.
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); OECD Nuclear Energy Agency, Boulogne Billancourt (France); World Nuclear Association, London (United Kingdom); United Nations Economic Commission for Europe, Geneva (Switzerland); vp; 2014; 33 p; URAM 2014: International Symposium on Uranium Raw Material for the Nuclear Fuel Cycle: Exploration, Mining, Production, Supply and Demand, Economics and Environmental Issues; Vienna (Austria); 23-27 Jun 2014; Also available on-line: http://www-pub.iaea.org/iaeameetings/cn216pn/Wednesday/Session6/138-Farmer.pdf
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AbstractAbstract
[en] A report has recently been made public which describes the findings of the International Uranium Resources Evaluation Project (IUREP) Mission to Madagascar. The IUREP Orientation Phase Mission to Madagascar estimates the Speculative Resources of that country to be within the wide range of 4 000 to 38 000 tonnes uranium. Such resources could lie in areas with known occurrences (uranothorianite, Ft. Dauphin up to 5 000 t U, i.e. 'pegmatoids'; uranocircite, Antsirabe up to 3 000 t U in Neogene sediments; carnotiteautonite, Karoo area up to 30 000 t U in sandstones and in areas with as yet untested environments (e.g. related to unconformities and calcretes). Modifications to existing uranium exploration programmes are suggested and policy alternatives reviewed. No specific budget is proposed. (author)
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1985; 30 p; 2 figs, 2 tabs
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