Ammonia leaching of sulfide copper concentrates generate buffer type liquors (pH ranges from 9 to 10), because of the excess of ammonia and significant amount of ammonia sulfate as a leaching agent. Metals such as Cu, Ni, Co and Zn occur in ammonia systems as a cationic amminacomplexes. Alkalinity of the solution and free
Ammonia leaching was first used for recovery of non-ferrous metals such as copper from oxide ores or ores containing pure copper, but gradually the use of this technology was developed from more ...
It is desirable to obtain high copper dissolution rate for relnoval of copper from ferrous scrap by ammonia leaching. In this study, a new ammonia leaching process using a injection. rnethod in a closed circuit system is proposed to improve copper dissolution rate and to prevent ammonia from vaporization loss.
of copper in their investigation on the oxidative ammonia/ammonium sulphate leaching of a complex synthetic matte (Cu-Ni-Fe-Co). Chang and Liu studies on the feasibility of copper leaching from industrial sludge using ammonia solutions managed to recover 94%
On a commercial scale the leaching of native copper ores by a solution of ammonia and ammonium carbonate is possible as in the case of Calumet and Hecla Mining Co. (3). Universal Mineral and Metals, Inc. leaches scrap copper by a solution of ammonia,
copper-leaching-solvent-extraction-and-electrowinning-technology 3/13 Downloaded from speedtest.jpplus.com on October 9, 2021 by guest 1981 Extractive Metallurgy of Copper-Anil Kumar Biswas 1976 Copper Recovery from Conglomerate-type Native Copper Ore by Ammonia Leaching, Solvent Extraction, and Electrowinning-Thomas H. Jeffers 1979
One of the difficulties for effective metal recovery is the separation of different metals from the solution after leaching. In this research, a full hydrometallurgical process is developed to selectively recover valuable metals (Ni, Co and Li) from cathode scrap of spent lithium ion batteries.
copper from ferrous scrap by ammonia leaching. Fig. 7. Relationship between leaching speed of copper per unit surface area and NH 3 concentration in 1 kmol m-3 NH 4Cl containing 0.5 kmol m-3 Cu(II) at 313 K. Fig. 8. Relationship between leaching speed of copper per unit surface area and NH Cl concentration in 4 kmol m-3 NH
compatible with the copper leaching process because it did not extract copper below pH36. Technically this problem could be solved by neutralizing the acid leach liquor or by leaching oxide copper with ammonia, but neither solution was economical. a molecule that extracted copper well from typical dump leach liquors (pH 1.8) had to be built. The
Arizona). Unlike copper sulphide leaching, ammoniacal leaching of copper metal does not give rise IO an ammonium sulphate by-product and, in theory, all the ammonia can be recycled in the process between the leaching step and the solvent extraction step. However, the hydroxy oximes extract
Part I Leaching of ores/secondary materials and recovery of electrolytic/chemical manganese dioxide. By Chu Cheng. Aqueous metal recovery techniques from e-scrap Hydrometallurgy in recycling. By Haci Deveci. B.Tech Project report IIT BHU. By JAKKU SRI HARSHA.
Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals, such as iron and manganese, along with the copper or cobalt, as sulphuric acid does. Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching 16. The ammonia leaching process is more environment friendly than
the best leaching efficiency for copper, in their feasibility of copper leaching from an industrial sludge using ammonia solution. This present work will develop the effect of nitric acid/ammonia ratio on the leaching of rich - cobalt copper oxidised ore. It will also evaluate the effect of key parameters (time, ammonia concentration, and pH ...
The leaching speed of copper in an ammonia solution containing ammonium chloride was higher than that in an ammonia solution containing ammonium sulfate. Key words Copper Dissolution, Ammonia Solution, Waste, Leaching, Hydrometallurgical Process 1. Introduction The metals recovery from waste materials is important for
reported the selective leaching of copper from motor scraps using cupric ammine solutions.1,2) Zhou et al. studied the removal of copper from ferrous scrap by an ammonia leaching method.3,4) In these studies, Cu(I) ions were obtained under an air or oxygen atmosphere as the reaction product, and then metallic copper would be electrowon from
Copper Ore by Ammonia Leaching, Solvent Extraction, and Electrowinning-Rees D. Groves 1979 COPPER Hydrometallurgy-1995 Review on Copper Hydrometallurgy-Roger Rumbu Extractive Metallurgy of Copper-Anil Kumar Biswas 1976 Copper Recovery from Conglomerate-type Native Copper Ore by Ammonia Leaching, Solvent Extraction, and Electrowinning-Thomas H ...
Eh-pH diagrams of various metal-ammonia-water systems are presented. Also presented is a comprehensive literature survey on the leaching behavior of metals in ammoniacal solutions. The metals considered in this paper are copper, cobalt, nickel, zinc, cadmium, silver, gold and palladium.
Abstract In this research cyanide-free leaching of pure gold and pressure oxidized refractory gold concentrate by thiosulfate-copper-ammonia solutions were examined. A quartz crystal microbalance (QCM) was used to study gold leaching as a factorial series where the best gold leaching rate (2.987
In ammonia leaching of oxidized copper ores, as the dissolution reactions happen at mildly acidic or basic conditions, some metal impurities, which pass into the solution during the dissolution of ore, precipitate because of the high pH of the solution.
that the extraction of copper was halved by the use of ammonia, thus leading to significant reductions in the amount of cyanide consumed in the full-scale leaching system. KEYWORDS Gold-copper ore treatment. Gedabek mine, Azerbaijan. Resin-in-pulp process for gold extraction. Ammonia assisted cyanide leaching. Plant-scale results. 1.
FIELD chemistry.SUBSTANCE invention relates to a technology for producing a copper ammonium carbonate solution (CACS), which can be used in the chemical industry in obtaining raw materials and intermediates in the production of catalysts, as well as in agriculture, animal husbandry, construction as a fungicide and antiseptic. Method for the preparation of a copper ammonium carbonate solution ...
Copper sulfate pentahydrate production from ammoniacal leach liquor Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Copper sulfate pentahydrate production from ammoniacal leach liquor, quarry, aggregate, and different kinds of minerals.
The leaching operation can be carried out in a leach tank by flowing the cupric ammonium carbonate complex leach solution through the copper-bearing material placed therein. The solution can be circulated repeatedly through the tank by means of connecting pipes and a pump to increase the cuprous ammonium carbonate complex content of the ...
Regarding the influence of the addition of copper on the leaching rates, it was observed that, unlike literature data (Jeffrey, 2001 Jeffrey, M. I. Kinetic aspects of gold and silver leaching in ammonia-thiosulfate solutions. Hydrometallurgy, 60(1), 7-16 (2001).
It is desirable to obtain high copper dissolution rate for relnoval of copper from ferrous scrap by ammonia leaching. In this study, a new ammonia leaching process using a injection. rnethod in a closed circuit system is proposed to improve copper dissolution rate and to prevent ammonia from vaporization loss. The copper dissolution. rate have been measured under injection of oxygen.
copper recovery directly from PCBs and reported the highest leaching efciency for ammoniaammonium per-sulfate solution. At optimum conditions, 90 % Cu, 60 % Zn and 9 % Ni were dissolved from the waste in 10 h. Copper with a purity of 99.97 % was obtained in the subsequent electrowinning step. The aim of this work was to investigate the dissolu-
Jan 25, 1995 Copper removal experiment of real scrap was carried out using 200 l reaction tank, and effectiveness of ammonia leaching method using oxygen circulation method was clarified. Schredder scrap as a representative scrap from automobile repairment factory, motor scrap with high copper content and dynamo scrap were taken as test materials.
Nov 26, 2014 The following consecutive stages were proposed smelting of the scraps to produce CuZnAg alloy, leaching of the alloy in ammoniacal solution, and selective copper electrowinning. CuZnAg alloy was a polymetallic and five-phase system. It was leached in chloride, carbonate, sulfate and thiosulfate solutions.
Aug 25, 2020 Ammonia leaching of slag from direct-to-blister copper smelting technology. Smelting of copper concentrates in a flash furnace directly into a copper blister results in the production of slag with high copper and lead content.
Abstract The dissolution of copper in aqueous solutions of ammonia is a corrosion process in which the cathodic reaction is the reduction of oxygen at the surface of the metal according to docume...
leaching agent of ammonia-ammonium persulfate, to recover copper. Cu and Zn leaching were found to be fast and reached equilibrium in 6h whereas for Ni, prolonged leaching time was needed. The best leaching efficiency was found to be around 99% Cu, 60% Zn and 9% Ni with 5M ammonia, 0.5M ammonium persulfate concentration, which suggested a ...
improved to 90%. Similarly, the pretreatment of the ore by ammonia leaching was shownto lead to high gold extractions (98%), in subsequent cyanide leaching with significant reductions in the consumption of cyanide. This appeared to be linked with the ready dissolution/removal of copper
which form soluble complexes with metal ions at higher pH(5)(6). Leaching of copper can be accomplished with ammonia solution in which metal such as copper is selectively extracted while restricting the dissolution of iron or manganese. Both metals can pose a real problem in the subsequent stages of hydrometallurgical
Leaching process for copper ore includes acid leaching and ammonia leaching. Leaching process is mainly for oxide copper that is very difficult to be extracted by flotation. Also for some copper ore it is combined by both oxide copper ore and sulfide copper ore, after processing test combined processing technologies can also be adopted to ...
Jun 24, 2004 In this study, the leaching kinetics of malachite CuCO3Cu(OH)2, an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the leaching rate of malachite