Ammonia Leaching Of Copper

(PDF) Conference Proceeding: TREATMENT OF A COPPER

This study has shown ammonia pretreatment and ammonia assisted cyanide leaching of a copper-rich gold ore. Ammonia pretreatment prior to cyanide leaching, was found to be effective, with a significant improvement in the extraction of gold from 12.3% to 98.2%, apparently due to the removal of easily soluble copper present in the ore.

Aqueous ammonia as a leaching abundant source of sulfide copper in the earth’s crust; agent is fairly non-corrosive and leaching reactions occur and 2) it is one of the most refractory sulfide copper in relatively mild conditions [9]. The best known minerals [1].

However, the use of ammonia as the additive and high reagent consumption have severely limited the development and commercial application of the traditional copper-ammonia-thiosulfate leaching

Leaching of Gold with Copper-citrate-thiosulfate Solutions

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. Besides, ammonia forms stable complexes with copper ions, and this can lead to an increase

Oct 21, 2019 The leaching order of copper in different minerals at different temperatures was as follows: malachite, chrysocolla and pseudo-malachite copper-bearing chlorite copper

Keywords: Ammonia concentration, copper, leaching temperature, leaching time, nickel, pH 1. Introduction The recovery of base metals from matte (a mixture of metal sulfides and precious metals) has been an important pro-cess in the refining of precious metals. Nickel–copper

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 processing -

have reviewed the applications of ammonia leaching in copper industry, and reported the advantages and disadvantages of this method [6]. Ammoniacal leaching of the Sarcheshmeh chalcopyrite concentrate has been studied by Nabizadeh et al. [7]. According to their results, about 70% of copper was effectively extracted at

Comparison of various extractants for recovery of

Kinetics of copper dissolution

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, ammonium carbonate, and copper

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% of copper

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

Optimal leaching was achieved and further refined for the ASR in a two-step indirect leaching system with biogenic ammonia. Copper leaching was the result of local corrosion and differences in leaching against the synthetic (NH 4) 2 CO 3 control could be accounted for by pH shifts from microbial metabolism, subsequently altering free NH 3

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.

Ammonia Leaching: A New Approach of Copper Industry in

AMMONIA LEACHING Abstract-of the Disclosure An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach

Keywords: Ammonia concentration, copper, leaching temperature, leaching time, nickel, pH 1. Introduction The recovery of base metals from matte (a mixture of metal sulfides and precious metals) has been an important pro-cess in the refining of precious metals. Nickel–copper

However, the use of ammonia as the additive and high reagent consumption have severely limited the development and commercial application of the traditional copper-ammonia-thiosulfate leaching

(PDF) Industrial Application of Ammonia Assisted Cyanide

When ammonia was introduced into the industrial agitation leach plant, there was no improvement in the extraction of gold, in contrast to the bottle roll tests, but the extraction of copper was halved, thus leading to significant reductions in the amount of cyanide consumed in the full-scale leaching system.

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 processing -

DEVELOPMENT AND IMPLEMENTATION OF SOLVENT

Feb 01, 2015 Trans. Nonferrous Met. Soc. China 25(2015) 597 ˆ’607 Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching A. D. BAS, E. KOC, E. Y. YAZICI, H. DEVECI Hydromet-B&PM Group, Division of Mineral & Coal Processing, Department of Mining Engineering, Karadeniz Technical University, Trabzon 61080, Turkey Received

Susumu Morioka, Kazuyoshi Shimakage, Studies on the Ammonia Pressure Leaching of Metallic Nickel and Copper Powders, Transactions of the Japan Institute of Metals, 10.2320/matertrans1960.12.197, 12, 3, (197-205), (1971).

Treatment of copper rich gold ore by cyanide leaching. 01/02/2015 The treatment of a copper sulphide bearing gold ore by direct cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching was investigated. Dissolution behaviour of gold and copper in these leaching systems

From the above results, the optimum conditions for thiosulfate leaching of gold with copper-ammonia catalysis were obtained as follows: Cu 2+ 0.025 mol/L, NH 3 1.5 mol/L, S 2 O 3 2− 0.2 mol/L and time 8 h. Under the conditions, 88.3% of gold leaching percentage was obtained, which was close to that (i.e. 90.3%) of cyanide leaching.

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, ammonium carbonate, and copper

Kinetics of copper dissolution

Jun 24, 2004 In this study, the leaching kinetics of malachite [CuCO3 Cu(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

Ammonia leaching - Phelps Dodge Corporation

An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach liquor is treated with a strongly alkaline

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% of copper

Optimal leaching was achieved and further refined for the ASR in a two-step indirect leaching system with biogenic ammonia. Copper leaching was the result of local corrosion and differences in leaching against the synthetic (NH 4) 2 CO 3 control could be accounted for by pH shifts from microbial metabolism, subsequently altering free NH 3

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

COPPER(II) EXTRACTION FROM AMMONIA LEACH

The ammonia–cyanide leach system was first patented over 100 years ago and stands out as a unique method of selectively leaching up to 90% Au and 1% Cu from oxidised copper–gold ores using

Mar 26, 2008 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.