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In-situ leaching (ISL), also called in-situ recovery (ISR) or solution mining, is a mining process used to recover minerals such as copper and uranium through boreholes drilled into a deposit, in situ.In situ leach works by artificially dissolving minerals occurring naturally in a solid state. For recovery of material occurring naturally in solution, see: Brine mining.
The leaching of oxide copper ore containing malachite, which is the unique copper mineral in the ore, by aqueous ammonia solution has been studied. The effect of leaching time, ammonium hydroxide, and ammonium carbonate concentration, pH, [NH 3 ]/[NH 4 + ] ratio, stirring speed, solid/liquid ratio, particle size, and temperature were investigated.
The results of experiments on the pressure leaching of the initial copper concentrate in an ammonium/ammonium-carbonate solution with oxygen as an oxidizing agent are .
Comparison of various extractants for recovery of Copper from Sarcheshmeh Chalcopyrite concentrate Ammonia/Ammonium Carbonate Leaching M. Ghanbari1, H. Naderi1* and M. Torabi2 1. Mining and Metallurgical Engineering Department, Yazd University, Yazd, 2. Research & Development Division, Sarcheshmeh Copper Complex, Kerman,
malachite in ammonia ammonium carbonate l– eaching" Hydrometallurgy, vol. 76, issue 1-2, 2005,pp. 55-62 [8] Chang chinJung- and J.C. Liu, "Feasibility of copper leaching from an
Ammonium sulfate byproduct is marketed as fertilizer. Other workers12 precipitated copper by adding ammonium bisulfite to CuSO4 solution. In another process13 14 it was suggested to add sodium bisulfite (or magnesium bisulfite) instead of ammonium sulfite, to the copper sulfate leach solution and heat to 80ºC to precipitate Chevreul's salt ...
Sep 22, 2006· Less well known is the fact that ammonium carbonate extraction was used for the commercial recovery of zinc decades before its application to either copper or nickel. This article reviews the published data on the Schnabel Process (the hydrometallurgical extraction of zinc by ammonium carbonate) covering the period of 1880–2005.
leaching, cementation, precipitation, and roasting. Flue dust was leached at room temperature with an alkaline solution of (NH4)2C03 and NHpH to solubilize ZnO and Zn metal. Some copper, lead, tin, and most of the zinc were dissolved in the leach step. Copper, lead, and tin were recovered in the cement product. The Zn in the flltrate was
Dec 10, 2013· Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals. New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching have resulted in a new approach in the world to this method.
At optimum leaching conditions (ammonia/ammonium carbonate concentration ratio: 5M NH 4 OH + 0.3M (NH 4) 2 CO 3, solid/liquid ratio: 1/10 g/m1, leaching times: 180 minutes, stirring speed: 350 ...
ammonia/nitric acid leaching of copper cobalt semantic scholar. leached in ammonia/nitric acid solution at room temperature. the effects of time ammonia acid was considered as catalytic element to enhance copper leaching kinetic. ammonium carbonate solution at room temperature and reached an.
Keywords: Ammonium carbonate, Hydrogen peroxide, Leaching, Chemical reaction, Extraction rate, Activation energy and uranium residue Introduction The uranium residue consists of insoluble precipitate that forms when target plates of uranium and aluminum alloy are dissolved during the production of molybdenum-99 for use in technetium generators.
The leaching kinetic data for cobalt from monometallic cobalt sulfide, showed that the process follows the surface reaction model similar to copper, with a steady activation energy of 6.5 kJ/mol. In contrast to nickel, the leaching of cobalt from cobalt sulfide had a higher order with respect to ammonium carbonate of 1.8 than with respect to ...
LEACHING OF METALS AFTER TREATMENT OF SLUDGE TO REMOVE COPPER AND NICKEL Residues from the two-stage, ammonium-carbonate leaching Experiments 35A and 35B, and for dried sludge, were analyzed as follows: Residue Residue Dried, Unleached 35B 36B Sludge Copper, percent 1.6 1.3 5.9 Nickel, percent 0.59 0..70 1.3 Chromium, percent 13.2 13.0 12.3 32
Probably, ammonium carbonate fulfils most if not all of the above requirements. The results derived from leaching experiments, using ammonium carbonate solutions and various experimental variables, on the copper flue dust are summarized in Table 2. From this series of experiments it can be deduced that under the various experimental
Additional Physical Format: Online version: Staker, W.L. (W. Lyman). Improved cupric ammonium carbonate leaching of copper scrap. [Washington, D.C.] : U.S. Dept. of ...
Leaching kinetics of copper flotation tailings in aqueous . The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution to recover copper from the flotation tailings of waste copper oxide residue The main copper minerals contained in the flotation tailings are chrysocolla malachite [Chat Online]
The hydrometallurgical copper extraction processes of the present teachings generally including two steps: a conditioning or activating step using low concentrations of ammonia and ammonium in an aqueous solution; and an acid leaching step. The processes of the present teachings can be performed at low temperature, for example, at ambient temperature, and at atmospheric pressure.
In this work, the leaching kinetics of malachite in ammonium sulfate solutions was investigated, and metallic copper was recovered by the cementation method from the resulting actual leach solution. Copper (II) oxide was prepared by an isothermal oxidation method from the cement copper. In the leaching experiments, the effects of reaction tem-
leaching of copper oxides containing malachite in ammonia/ammonium carbonate are the interface transfer and diffusion across the product layer with an activation energy of 15 kJ/mol. Copper dissolution from a malachite ore in ammonium nitrate solutions was reported by Ekmekyapar et al. (2012)tobea mixed kinetic model, including both surface ...
Keywords: hydrometallurgy, hydroxyoximes, LIX, copper ore, copper concentrate Introduction Ammonia leaching is frequently used in hydrometallurgy for processing of oxide and sulfide ores, concentrates or by-products, particularly those containing significant amounts of carbonate rocks, which during the acidic leaching contribute to increased
Thus, precipitation of copper does not occur during leaching. Because ammonium sulfate solutions have mildly acidic character, ferric ions (Fe 3+) passing into the solution during the leaching process precipitate in the form of Fe(OH) 3.Thus, a high purity solution can be obtained.
The leaching solution is a mixture of ammonium carbonate and ammonium hydroxide and it is preferably carried out in the presence of an oxidizing gas, for example air or oxygen to oxidize cuprous ions into cupric ions. Further, depending on the potential pH diagram of Cu-NH 3-H2O system, metallic copper can be easily oxidized in an ammonical ...
Experiments on ammonium carbonate leachng of native copper ores crushed to 1-inch size showed that in 30 days 55 percent of the copper was extracted from 0.7 percent copper conglomerate-type ore, and 85 percent was extracted from 2.1 percent copper amygdaloid-type ore.
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