Uranium Extraction From Turbid Liquids By Continuous Ion Exchange Processes

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Mots clés : Hydrometallurgy;Ion exchange;Uranium extraction;Resins;Leach liquors;Fluidized-bed systems;Adsorption columns
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Publication: CIM Bulletin
Auteur(s): Louis M. Perlman
Mots clés: Mineral resources, Population growth, Consumption, Economic growth, Resources, Reserves.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: Mineral development and utilization affect the health of the economy and the pattern of long-term development throughout Canada. There are many diverse opinions on the contribution of minerals to the economy, but there is a dearth of adequate quantitative information. This paper discusses some recent research and provides some new information.
Publication: CIM Bulletin
Auteur(s): D. J. McCulla
Mots clés: Mineral economics, Economy, Mineral development, Statistics, Input-output models, Ferrous industries, Manufacturing.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: In his Budget Speech on March 31, 1977, the Honourable Donald S. Macdonald expressed concern about the financing of investments through new equity issues. He mentioned the need to render more attractive participation in the equity market by investors in all income brackets. One of the measures introduced in the budget to accomplish this goal is the proposal to increase the dividend gross-up and tax credit in respect of most dividends received by an individual from Canadian companies. The...
Publication: CIM Bulletin
Auteur(s): R. D. Brown
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: There appears to a definite trend toward the hoisting of greater tonnages from greater depths. There is every indication that this trend will continue and we feel that improvements in the design, fabrication and installation of mine guides will be of significant importance in the future. The present state of the art in mine-shaft guide systems is reviewed and the parameters required for improvement are derived in this paper. Finally, a proposal is made for a new steel guide system which meets...
Publication: CIM Bulletin
Auteur(s): J. S. Redpath, W. M. Shaver
Mots clés: Hoisting, Shaft guides, Guide systems, Skips, Wood guides, Rope guides, Steel guides, Redpath Experimental Proposal.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: Because segments of the Canadian mineral-based economy are dependent totally or in part on foreign sources of certain minerals, their well-being may well be affected by inability to obtain these minerals. Where such dependency exists, it is therefore important that contingency plans be available to counteract possible price increases or lack of supplies by means of technology, developed well in advance of any pending crisis. Canada is vulnerable to possible future real or artificial shortages...
Publication: CIM Bulletin
Auteur(s): L. L. Sirois, A. Winer, W. A. Gow
Mots clés: Mineral resources, Industrial minerals, Imports, Alumina, Phosphate, Manganese, Chromium, Vanadium, Fluorspar, Tin, Kaolin, Bentonite.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: The rates of return on investment are examined for several major Canadian mining companies. Because we are dealing with a highly cyclical industry, subjected to widely fluctuating metal prices, rates of return are examined over a 20-year period. Conveniently, the first decade examined reflects the period when the industry enjoyed incentives to develop deposits; during the second decade, incentives were reduced and the industry became the most heavily taxed industry in Canada. The high rates...
Publication: CIM Bulletin
Auteur(s): H. Reimer
Mots clés: Mineral economics, Economic trends, Rates of return, Investment, Taxation, Asbestos Corporation Ltd., Bethlehem Copper Corporation, Brunswick Mining and Smelting Corporation, Cominco Ltd., Denison Mines Ltd., Hudson Bay Mining & Smelting Co., Ltd., Inco Limited, Mattagami Lake Mines Ltd., Noranda Mines Ltd., Pine Point Mines Ltd., Rio Algom Ltd., Sherritt Gordon Mines Ltd.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: Western Mines' milling circuit produces three concentrates (copper, lead and zinc), with the tailings being disposed of at the bottom of Buttle Lake. In view of the mine's location and the method of tailing disposal, a comprehensive pollution control program has been in effect since start-up.
Changes in the ore over the past few years have required the use of increasing quantities of sodium cyanide in order to effect a good copper-lead separation. This led to the use of alkaline chlorination...
Publication: CIM Bulletin
Auteur(s): A. G. Eccles
Mots clés: Environmental control, Pollution control, Western Mines Limited, Myra Falls, Tailings disposal, Chlorination, Alkaline chlorination, Effluents.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: Fair market value, in the legal sense, is the price which a prudent and knowledgeable buyer and a prudent and knowledgeable seller, acting without constraint or compulsion, will agree upon to exchange an asset. In the ordinary commercial or engineering usage, the term, may imply simply the market value or a reasonable and equitable price.
The engineer evaluator who is called upon to express an opinion about the fair market value of an asset may be able to base his estimate on the sale price...
Publication: CIM Bulletin
Auteur(s): Walter f. Atkins
Mots clés: Mineral economics, Economic trends, Mining properties, Market values, Evaluations.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: Copper electrowinning at Duisburger Kupferhuette was introduced in March 1975. The electrowinning plant has a capacity of 10,000 mT of copper cathodes a year. The cuprous oxide feed material is an intermediate product of the treatment of the leach solutions, originating from chloridizing roasting of pyrite cinders. This material is characterized not only by a wide spectrum of accompanying impurities, but also by an unusually high level of precious metals. As the priority set was the productio...
Publication: CIM Bulletin
Auteur(s): H. Kudelka, R. Dobbener, N. L. Piret
Mots clés: Hydrometallurgy, Electrowinning, Copper electrowinning, Leaching, Purification, Iron Precipitation, Chloride precipitation, Starting sheets, Cathodes, Duisburger Kupferhuette.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: The objectives of this paper are: (a) to examine and discuss the burdens we place on our extractive industry; (b) to compare the levels of taxation in Canada with those in other countries; and (c) to suggest certain broad parameters within which our taxation policies may be made more rational and stable. Among the burdens identified are taxation, the ownership and use of our resources, environmental issues and the rather emotional issue of so-called 'super profits'.
Finally, the paper will...
Publication: CIM Bulletin
Auteur(s): Peter M. Watt
Mots clés: Taxation, Resources, Extractive industries, Environmental control, Mining taxation.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: A novel process has been developed for preparing directly workable steel ingots from prereduced iron ore pellets by a two-stage process. The pellets are continuously charged into an electric arc furnace, where molten metal is separated from the gangue. The molten metal flows out of this furnace through a hollow nonconsumable graphite electrode immersed in a molten flux in an elec-troslag furnace. The molten metal solidifies on a continuously withdrawing base plate to form the ingot. A variety...
Publication: CIM Bulletin
Auteur(s): R. H. Nafziger, G. L. Hundley, R. R. Jordan
Mots clés: Steelmaking, Electric arc furnaces, Electro-slag process, Pellets, Furnaces, Ingots.
Numéro: 785
Volume: 70
Année: 1977
Texte
Sommaire: It is important to define "adequacy," and the most useful definition is a continuing availability of mineral materials under cost and other conditions which imply no significant burden on the achievement of otherwise attainable levels of consumption and well-being. For current decision making, it is sufficient to consider adequacy just to the end of the century, with some regard being given to then remaining mineral inventory.
A comparison of cumulative demand projections to the year 2000...
Publication: CIM Bulletin
Auteur(s): Leonard L. Fischman
Mots clés: Mineral supplies, Resources, Reserves, Energy resources, Consumption, Economics.
Numéro: 785
Volume: 70
Année: 1977
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