In new research work Radmehr 2012 suitable parameters of ammoniacal column leaching for Meskani Mine copper ore in Iran were determined Taguchi method was
Abstract malachite ore is one of the most important of oxidized copper ores copper production can be performed by using this ore in this work the leaching kinetics of malachite in ammonium sulfate solutions was investigated and metallic copper was recovered by a cementation method from the resulting actual leach solution
C muzawazi j petersen heap and tank leaching of copper and nickel from a platreef flotation concentrate using ammoniacal solutions canadian metallurgical quarterly 1011791879139515y0000000017 54 3 297304 2015
Ammoniacal percolation leaching of copper the general feasibility of ammoniacal percolation leaching of copper sulphide ores has been demonstrated the rates are comparable to those of conventional ferric sulphatesulphuric acid systems but without the attendant problems of carbonate or iron dissolution for the ore column heights studied
Copper ores present in the southern democratic republic of congo are usually associated with cobalt and nickel ore sulfur ores as well as oxidized ores of copper and cobalt are present in the region ammonianitric acid leaching of copper cobalt oxidized ore kalanga gracias tshilombo af mulababafubiandi l
Jun 03 2020 the highest copper extraction efficiency was obtained in the leaching process that was conducted with the solutions obtained by mixing ammonia salts in the best conditions accordingly as a result of 6 h of leaching at 30 c in the presence of 225 nh4oh and 100 gl nh42s2o8 9147 of the copper was transferred into the solution while
Ammoniacal cyanide 1112 leaching of copper prior to cyanidation 268 cyanide recovery from effluents eg sart process 5 preaeration prior to cyanidation 61314 and addition of lead nitrate 1415 have been tested for the treatment of copperrich gold ores table 1 solubility of copper minerals in 01 nacn solution 12
Percolation leaching of a chalcopyrite bearing ore at ambient and elevated temperatures with bacteria by b w madsen 1 and r d groves 2 abstract the bureau of mines conducted a largescale 64 t longterm 2165 days test to gain a better understanding of the leaching characteris
Also there are no publications on the leaching kinetics of any copper minerals in the alkaline glycine system low grade coppergold ores have not been leached in the proposed lixiviant system in order to establish the influence of process variables on copper and gold leaching and the deportment of impurity metals furthermore no data has
Gold ore uneconomic if the ore contains too much copper as a result methods of economically processing goldcopper ores are becoming of increasing importance one of the more promising methods of treating these ores is by selective leaching of the gold by an ammoniacal cyanide solution a method first described by hunt in 1901 this method is
The leaching of copper using thiosulfate reagent as alternative reagent to cyanide has been investigated since it is almost presented in gold thiosulfate leaching in general copper is found in the gold leaching of complex ores 12 the present of copper reduces the
In this study copperassisted ammoniacal thiosulphate leaching of a copperrich gold ore was studied a cyanide leaching test was also carried out for comparison the experiments were designed using a taguchi l9 3 3 design for the evaluation of the effects of initial concentrations of thiosulphate ammonia and copper on gold extraction
Abstract hydrometallurgical processing of copperbearing materials ores concentrates byproducts is usually done with the use of acidic or ammonia leaching in the case where a leaching feed material contains significant amounts of carbonate rocks and iron minerals the second method is preferential due to a higher process selectivity
Method for selective recovery of copper from lowgrade electric and electronic wastes 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 vephase system it was
Dissolution and stability of copper and iron ions on the contrary chalcopyrite leaching in aqueous ammonia leads to the formation of so4 2instead of s0 due to high ph of ammoniacal media in general the major advantage of ammonia leaching process lies in its selectivity towards copper since ammonia forms soluble
Ammoniacal thiosulphate in the leaching of gold is considerably much more economical than cyanidation because less reagent is typically needed aylmore 2001 copper is generally found in the gold leaching of complex ores bhappu 1990 marsden and house 1992 the presence of copper decreases the gold leaching efficiency and it consumes an
Hori and okabe10 11 modified this process by roasting the sulfide ore to sulfate then leaching with ammoniacal ammonium sulfite the leach solution was then heated to 170 c under pressure to precipitate metallic copper according to cuso4 nh42so3 2 nh3 h2o cu 2nh42so4 ammonium sulfate byproduct is marketed as fertilizer
In all ammoniacal thiosulfate leaching processes the solution was prepared and then stabilized at ph of 105 by adding aqueous ammonia sodium thiosulfate of 95 of purity was used and 20 of aqueous ammonia as well cupric ions were introduced in form of copper sulfate pentahydrate the ore was added in the liquor in
Abstract thiosulfate offers a nontoxic alternative to cyanide for processing gold ores the mechanism of leaching gold using ammoniacal thiosulfate solution is driven by the cuiicui redox couple and is complicated by competing ligands such as nh 3 and s 2 o 3 2it is shown that an understanding of the copper speciation and sulfur speciation is required to optimize this system
A method of leaching copper values from copper dross obtained from pyrometallurgical lead bullion by contacting finelydivided particles of the copper dross with an aqueous ammoniacal solution preferably a solution of ammonium carbonate and ammonium hydroxide to dissolve copper from the dross the leaching will usually be carried out in a gas containing free oxygen and the leaching solution
The leaching of metal sulfides in ammoniacal solutions is of industrial importance for the production of copper nickel and cobalt in some processes such as the sherritt gordon process they are introduced as feed while in others such as the caron process they form insitu as intermediate products
Oxide copper leach modeling a simplified version of the model has been examined for percolation leaching of copper oxide ore essentially the model involves quasi steady state diffusion of the lixiviant through the previously reacted portion of the ore particles followed by chemical reaction at the surface of the unreacted core
In an ammoniacal leaching process for the recovery of nickel and cobalt from reduced nickeliferous ores copper contamination of the product liquor may be minimized or substantially avoided by controlling oxidation of ore constituents during aeration of a slurry of reduced ore and leach liquor
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
The leaching process of copper from calcareous bornite ore using ammonium persulfate as an oxidant in ammoniacal solution was investigated the effects of stirring speed temperature initial concentration of ammonia and ammonium persulfate and liquidtosolid ls ratio on the extraction percentage of copper from bornite ore were studied
1 introduction the study of copper adsorption on anion exchange resins has to do with the recovery of gold as present in the solutions produced by leaching gold ores in an ammoniathiosulfate media where copper is the main impurity in the system the ammoniathiosulfate system with copper offers high gold leaching rates compared to the cyanide system because the reaction is catalyzed by
Copper in a form practically inert to cyanidc today 364 heap leaching is used to process lowgrade ore and cip to treat high grade ore as the pit progresses in depth approaching the transition orebody thc copper content in the ore will increasc these high concentrations of cu moslly
Jul 27 1976 i claim 1 a method of leaching copper values from copper dross obtained from pyrometallurgical lead bullion comprising contacting finelydivided particles of the copper dross in the form of a metallic lead matrix containing copper and copper compound inclusions with an aqueous ammoniacal solution to dissolve copper from the dross wherein the leaching solution further contains both
It is generally known in metallurgical leaching practice that there is a minimum degree of fineness to which ore particles may be crushed for subsequent percolation leaching the reason for this is because the leaching column becomes clogged by the fine material thus preventing the desired rate of solution percolation
Introduction anodic dissolution anodic dissolution of copper sulfides such as copper concentrates or matte is not a new idea in 1882 m rchese 1 tried to apply this method to concentrates with low copper content but problems with the cells high tension contamination of the solution with iron during electrolysis and the bad quality of the cathodic deposit made him give up
Introduction dump leaching refers to percolation leaching of copper from runofmine lowgrade ores that have been piled on native ground these dumps typically cover hundreds of acres and contain millions of tons of lowgrade ore the leaching cycle covers a span of many years
