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Troncoso Cortez, Ulises Ivan
Universidad de Chile. Facultad de Ciencias Fisicas y Matematicas. Departamento de Ingenieria de Minas (Chile)2014
Universidad de Chile. Facultad de Ciencias Fisicas y Matematicas. Departamento de Ingenieria de Minas (Chile)2014
AbstractAbstract
[en] Starting in 2012 an in crease in the annual throughput from 1.4 to 1.8 millions tons has been projected by the Society of Mine Miraso. This increase is the result of the equipments upgrade works, which have been carried out in 2011 at the crushing plant as well as the heap stacking system. The main changes were associated to the belt conveyors and to the transfer chutes improvements of these two areas. However, the equipments and facilities associated to the agglomeration, leaching and solvent extraction operations were not modified. The objective of this work is to evaluate this new industrial scenario by identifying possible bottlenecks that may slow down the global production process. A study of the treatment capabilities of each main unit is conducted to accomplish this purpose. The evaluation was done in two stages. First of all, an update of the design criteria and the mass balance were performed to establish the Base Case. After that, two alternatives were included to evaluate the impact of the ore treatment increase, in one and two leaching cycles. Aside of the ore throughput increase, the most important changes with impact in the equipments capacities are the utilization reduction of the stacking system (from 80 to 71 %), the increase of the acid application into the agglomerator drum (from 16 to 30 kg/t) and the irrigation rate reduction at the leaching area (from 4.5 to 3.0 1/h/m2). At the agglomeration, the final conclusion is the equipments have the capacity to receive the production increase. However, there are some deviations that need to be corrected, such as the capacity and design of the water and acid injection pipes inside the drum. At the heap leaching area, the irrigation pump system is near the limit of the required capacity (280 m3 /h), so the leaching in two stages could be a solution. Nevertheless, this alternative is recommended as a punctual operational response, in case of an eventual increase in the suspended solids and consequent organic entrainments. Finally, it is recommended to increase the amine concentration at the solvent extraction plant, from 8 to 10%, and thus keep the plant efficiency transfer without to increase the organic flow rate
Original Title
Evaluacion de la capacidad de tratamiento de las unidades de aglomeracion, lixiviacion y extraccion con solventes por expansion de la produccion de una planta hidrometalurgica de uranio
Primary Subject
Source
2014; 1124 p; Available from Library of CCHEN; 25 refs., 20 figs., 30 tabs; Thesis (Ingeniero Civil en Minas)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
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Skolokin, L.I.; Leif, V.E.; Sednev, J.M.
Institut khimii i teknologii redkikh elementov i mineralnogo syrya kolskogo filiala akademii nauk SSR, Apatity (USSR)1989
Institut khimii i teknologii redkikh elementov i mineralnogo syrya kolskogo filiala akademii nauk SSR, Apatity (USSR)1989
AbstractAbstract
[en] A mixing-settling apparatus for liquid-liquid extraction comprises a casing. A first partition is mounted along its longitudinal axis and above an overflow device. The mixing device is connected to a means of feeding at least one of the phases and is shaped as at least one hollow element mounted essentially perpendicularly to the longitudinal axis of the casing. The walls of the hollow element are provided with openings, the outlet cross-sections of which are directed to the first partition. The first partition is provided with a means for regulating the height of the layer of the mixed phases M in the mixing zone, said means being located in the partition at the point most distant from the means for feeding phases L, S in the longitudinal direction. A second transporting device is mounted in the settling zone. It is fixed on to the casing and is located after the overflow device in the direction of movement of the light phase l. (author) 10 figs
Original Title
Smesitel'no-otstoynyj apparat dlya zhidkostno-zhidkostnoy ekstraktsii
Primary Subject
Source
29 Jun 1989; 20 p; WO PATENT DOCUMENT 89/05684/A1/
Record Type
Patent
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Mollataheri, R.; Afsari, S.; Piruzan, D., E-mail: reza.mollataheri@gmail.com
Proceedings of the international seminar on mineral processing technology: innovations in mineral processing2016
Proceedings of the international seminar on mineral processing technology: innovations in mineral processing2016
AbstractAbstract
[en] Gazestan deposit is located at 78 km from eastern of Bafgh (Central Iran) within carbonate rocks, shale, tuff, sandstone and volcanic rocks. Mineralization is the mixture of iron minerals and apatite together with minor quartz and calcite which occurs as various forms mainly in green rocks and rarely in rhyolite. Apatite is fluorapatite and content of Cl is very low. Monazite is the main mineral of gazestan that has been concentrated in apatitie and quarts. Based on assessments and simulation by mining software, the deposit tonnage of ore bodies is about 60 Mt. The grades of Fe, P and TREEs are 26%, 2%, 0.1 %, respectively. The beneficiation studies on a representative sample have been carried out in the lab scale. By operating magnetic separation flow-sheet, it is possible to produce a proper magnetic product containing about 67% Fe. Then Non-magnetic fraction was led to hydrometallurgical study. Finally, the experimental results show that it is possible to produce total rare earth elements product with recovery of about 80% by magnetic separation and hydrometallurgical methods. (author)
Primary Subject
Source
Indian Institute of Mineral Engineers, Mumbai-Pune Chapter, Mumbai (India); Tata Consultancy Services, Mumbai (India); Indian Institute of Technology Bombay, Mumbai (India); 617 p; 2016; p. 49-55; MPT-2016: international seminar on mineral processing technology: innovations in mineral processing; Pune (India); 5-7 Jan 2016; 9 refs., 4 figs., 3 tabs.
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Book
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Conference
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AbstractAbstract
[en] The hydrometalation of a carbon-carbon multiple bond is one of the most fundamental and straightforward methodologies for the preparation of new organometallics. Although hydroboration proceeds without any activators, most hydrometalations are promoted by transition metal catalysts. The hydroalumination of olefins catalyzed by titanium or zirconium compounds has been developed as a convenient route to a variety of alkylaluminum compounds, but most of these reactions require long reaction time or elevated temperature. We have demonstrated that monosubstituted olefins can be hydroaluminated with LiAlH4 in the presence of catalytic amounts of the [C5(CH3)5]2ZrCl2 under mild conditions. This reaction is rapid, and gives higher regioselectivity in excellent yields, and involves anti-Markovnikov addition. Further investigations of more useful applications are in progress
Primary Subject
Source
9 refs, 2 tabs
Record Type
Journal Article
Journal
Journal of the Korean Chemical Society; ISSN 1017-2548;
; v. 47(3); p. 297-300

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AbstractAbstract
[en] Worldwide developments of solvent extraction as applied to hydrometallurgy are described. Uranium and zirconium have been processed in this manner in Canada. (E.C.B.)
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Journal Article
Journal
Canadian Chemical Processing; v. 61(10); p. 27-28
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Raginskij, L.S.; Savenko, V.P.; Malysheva, T.A.
The first Russian conference on radiochemistry. Abstracts collection1994
The first Russian conference on radiochemistry. Abstracts collection1994
AbstractAbstract
No abstract available
Original Title
Razrabotka i opyt ehksplouatatsii pul'satsionnykh klapannykh nasosov-dozator ov dlya radiokhimicheskikh i gidrometallurgicheskikh proizvodstv
Primary Subject
Secondary Subject
Source
Rossijskaya Akademiya Nauk, Moskva (Russian Federation); Ministerstvo Rossijskoj Federatsii po Atomnoj Ehnergii, Moskva (Russian Federation); 288 p; 1994; p. 215; 1. Russian conference on radiochemistry; Pervaya Rossijskaya konferentsiya po radiokhimii; Dubna (Russian Federation); 17-19 May 1994
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Miscellaneous
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Conference
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AbstractAbstract
[en] The organization of the center of metallurgical studies and the functions carried out by each of its departments are outlined. The handling of data for designing mining metallurgy projects and personnel training is also included. (author)
Original Title
Centro de estudios metalurgicos
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Record Type
Journal Article
Journal
Energia del Fuego al Atomo; v. 2(19-20); p. 44-49
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AbstractAbstract
[en] This paper characterized the microstructure and physical properties of the scale from a uranium mine in Xinjiang by SEM, XRD and FT-IR. Based on the orthogonal experiment design, the formula of HClO4: EDTA: (NaF + HNO3) = 4:1:5 is selected. The results show that the scale remover has the functions of dissolution, lattice damage and dispersion. The selected collaborative scale removal method can effectively remove the scale in the uranium mining process and has certain application value. (author)
Primary Subject
Source
20 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 328(3); p. 991-1000

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Renaud, J.; Boutonnet, G.
International Atomic Energy Agency, Vienna (Austria)1977
International Atomic Energy Agency, Vienna (Austria)1977
AbstractAbstract
[en] The new technologies on hydrometallurgy which are described concern operating conditions of acid leaching, solid liquid separation after leaching, and solvents recuperation of uranium. The acid leaching of the pulp obtained from a humid crushing uses sulfuric acid in variable but always in fairly high quantities. This is being due to the loss of free residual acid at the end of the leaching. Indeed, experience shows that a good yield of uranium solubilisation can generally be obtained if the percentage of free acid remains over a determined level. All experiences done in the world to recover this acid by the means of a methodic leaching at counter-current have failed because of filtration problems. This question can be partly solved, if after dry crushing and preheating of the ore, a leaching by S.A. is done at a suitable concentration in order to obtain a thick middle. This technique has been successfully applied at the Arlit plant, operated since 1971 by SOMAIR in the Niger Republic. This technique will also be applied, with minor differences in the Akouta Plant, also in Niger, which is now under studies for the account of COMINAK. The solid-liquid separation and the washing of the pulp by counter-current methodic circulation in a set of decanters shows several disadvantages. They need large quantities of water. They accordingly give very diluted uranium solutions. But the down stream installations for the uranium recuperation, and mainly solvents installation are larger and consequently as costly to build and to operate as uranium content of solution is low. They take a long time and a lot of difficulties to stop and to restart, they cannot be stopped regularly such as at the end of the week. They give a very liquid cake, which needs, for its storage, a failing disposal with high level of security against any accidental losses of liquid to surrounding waters. These troubles can be avoided by a washing and a separation on filters. This technique, which was very difficult and costly year ago when using rotating filters has been largely improved by the use of horizontal bands filters. In most cases, their use improves greatly the concentration operations. This is an already old process. But in this field, many technologies have been developed for improving efficiency. These improvements, as well as the increase of uranium in influents allow to reduce within a great proportion the cost of investments and of exploitation of such solvents installation. At last, very pure concentrates, especially of ammoniac diuranate, can be obtained by judicious arrangement between means of extraction and reextraction. Consequently, it is possible to consider for UF4 and UF6 plants a ''short way'' more rapid and less expensive than the ordinary way now used
[fr]
Les nouvelles technologies developpees dans le domaine de l'hydrometallurgie portent, principalement, sur les conditions operatoires de la lixiviation acide, la separation solide-liquide apres lixiviation, et la recuperation de l'uranium par solvants. L'attaque acide de la pulpe issue d'un broyage humide est generatrice d'une consommation d'A.S. variable, mais toujours elevee, du fait de la perte d'acide residuaire libre en fin d'attaque. Un rendement satisfaisant de solubilisation de l'uranium n'est generalement obtenu qu'a condition que ce taux d'acide libre reste au-dessus d'un certain seuil. Or, les nombreuses tentatives pour recuperer cet acide ont pratiquement echoue en raison des difficultes de filtration. On peut proceder, apres broyage a sec et prechauffe du minerai, a une attaque par de l'A.S. a concentration convenable pour l'obtention d'un milieu epais, appliquee avec succes a l'usine d'ARLIT, exploitee depuis 1971 par la SOMAIR en Republique du Niger. Elle sera appliquee differente, a l'usine d'AKOUTA, egalement au Niger, et actuellement a l'etude pour le compte de la COMINAK. La separation solide-liquide et le lavage de la pulpe par circulation methodique a contrecourant sur un ensemble de decanteurs requierent une grande quantite d'eau de lavage; delivrent, en consequence, des solutions uraniferes tres diluees. Or, les installations de recuperation d'U situees en aval, notamment celles, les plus repandues, utilisant les solvants, sont d'autant plus grandes, et par suite, d'autant plus onereuses de construction et d'exploitation que le taux de l'uranium dans ces solutions est plus bas; ils sont plus longs et difficiles a arreter et a remettre en marche; ils ne se pretent donc pas a des arrets reguliers; et enfin, ils delivrent un gateau tres liquide, obligeant a disposer, pour son stockage, d'un champ d'epandage possedant toute surete contre les departs accidentels de boue vers les rivieres environnantes. Ces inconvenients sont evites en procedant au lavage et a la separation sur filtres, surtout a bandes horizontales. De nombreuses technologies ameliorent l'efficacite d'une recuperation par solvants. Conjointement avec l'augmentation du taux des influents (voir B), elles permettent de reduire notablement les frais d'investissement et d'exploitation des installations de solvants. Des combinaisons d'extraction et de reextraction permettent d'aboutir a des concentres, et notamment a un diuranate d'ammoniaque, tres pursOriginal Title
Nouvelles technologies pour le traitement des minerais d'uranium
Primary Subject
Source
1977; 10 p; International conference on nuclear power and its fuel cycles; Salzburg, Austria; 2 - 13 May 1977; 2.2.-.T.1./01.
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Report
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Conference
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AbstractAbstract
[en] The selectivity and suitable beneficiation methods for various kinds of uranium ores in China are discussed. Different processing flows for diffeent ores beneficiation and combined ore beneficiation-hydrometallurgy can increase ore feed in hydrometallurgy and the recovery of accompanying elements and reduce the costs of hydrometallurgy. Finally, the author brings out conclusion and suggestion on how to increase economic efficiency of ore deposits
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