• (PDF) Ammonia Leaching: A New Approach of Copper Industry

    The dissolution of copper in ammonia solution as a function of time at various concentrations of ammonia (Stirring speed of 600 rpm and oxygen pressure of 304 kPa) Effect of oxygen pressure on the.

  • Ammonia Leaching: A New Approach of Copper Industry in

    Dec 10, 2013· 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 traditional elements of copper, nickel and cobalt to the extractive metallurgy of zinc, cadmium, silver and gold [ 1 ].

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  • (PDF) Ammonia leaching in the copper industry: a review

    Ammonia leaching was first used f or recovery of non-ferrous metals such as copper from oxide ores or ores containing pure cop per, but gradually the us e of this technolog y was de veloped from m.

  • Leaching of copper from tailings using ammonia/ammonium

    Aug 03, 2010· The main important parameters in ammonia leaching of copper tailings have been prioritized as solid/liquid ratio, leaching time, temperature and the concentration of ammonia. The optimum leaching conditions are found to be: 4/1 liquid/solid ratio, 4h leaching time, 40°C, 3 mol/L NH4 +. More than 75% of copper was effectively recovered.

  • Optimal Conditions for Ammonia Leaching of Copper

    Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt [11]. The reported difficulty encountered with the ammonia leaching approach, however,

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  • COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

    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-Ammonia Complex Chemdemos

    Copper-Ammonia Complex When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper (II) chloride, a powdery, light blue precipitate of copper (II) hydroxide forms. Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex.

  • Use of Ammonia Salts in Selective Copper Extraction from

    Jun 03, 2020· Generally, copper is soluble as amine complexes during the ammonia leaching, while iron is hydrolyzed to an insoluble hydrated iron oxide remaining in the leach residue [ 8 ]. The iron ammonia complex formed was quickly converted to FeOOH and then to Fe 2 O 3.nH 2 O in such an oxidative basic environment [ 9 ].

  • Author: M. Deniz Turan, Ramazan Orhan, Mücevher Turan, Hasan Nizamoğlu
  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    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

  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    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, am-

  • COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

    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

  • Optimal Conditions for Ammonia Leaching of Copper

    Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt [11]. The reported difficulty encountered with the ammonia leaching approach, however,

  • Characterization and kinetic study on ammonia leaching of

    be a crucial step since ammonia is known to be an active contributor to the Cu leaching reaction. Besides copper sulphide, NH3/NH4 + leaching was used for other copper minerals such malachite, low-grade mixed Cu ore, tenorite [17−19]. The reported studies on chalcopyrite leaching in ammonia solutions were based on either high-grade

  • Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized Ore

    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

  • Ammonia Leaching: A New Approach of Copper Industry in

    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.

  • Investigation of Copper Ammonia Leaching from Smelter

    Although ammonia leaching of copper from slags has been reported generally as a part of copper slag utilization methods, but no detailed studies have been reported in the literature.

  • Copper-Ammonia Complex Chemdemos

    Copper-Ammonia Complex When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper (II) chloride, a powdery, light blue precipitate of copper (II) hydroxide forms. Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex.

  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    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.

  • Copper Leaching Behavior from Waste Printed Circuit Board

    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

  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    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, am-

  • Leaching of Malachite Ore in NH3-Saturated Water

    Jun 24, 2004· Abstract In this study, the leaching kinetics of malachite [CuCO 3 ·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.

  • The Principles and Applications of Ammonia Leaching of

    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.

  • Ammonia leaching of slag from direct-to-blister copper

    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.

  • Treatment of copper-rich gold ore by cyanide leaching

    leaching, ammonia leaching has the merits of high selectivity over gang minerals, low corrosivity and application in alkaline conditions [8]. MUIR et al [8] demonstrated the removal of copper (up to 95%) from an oxidised tailings via ammonia leaching, which resulted in a substantially reduced reagent consumption (from 30

  • Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized Ore

    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

  • Characterization and kinetic study on ammonia leaching of

    be a crucial step since ammonia is known to be an active contributor to the Cu leaching reaction. Besides copper sulphide, NH3/NH4 + leaching was used for other copper minerals such malachite, low-grade mixed Cu ore, tenorite [17−19]. The reported studies on chalcopyrite leaching in ammonia solutions were based on either high-grade

  • US4165264A Ammonia leaching Google Patents

    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

  • Technical Overview August 2019 Metaleach

    Typical Capital and Operating Costs for Copper Heap Leaching An analysis of the economics of the AmmLeach® process compared with conventional acid leaching for high acid consuming copper ores is dependent upon a multitude of parameters specific to the mineralogy of the deposit and its location. gangue minerals during leaching, ammonia is

  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    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.

  • Ammonia Leaching as a Pre-Treatment for the Processing of

    Ammonia leaching as a pre-treatment for the processing of oxidised PGM ores . By Research Candidate: Kabwe Musonda . Supervisors: Professor Jochen Petersen . Figure 17: Eh-pH diagram for the copper-ammonia-water system at 25°C and 101.3 kPa (Takeno, 2005)

  • Copper-Ammonia Complex Chemdemos

    Copper-Ammonia Complex When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper (II) chloride, a powdery, light blue precipitate of copper (II) hydroxide forms. Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex.

  • Copper Leaching Behavior from Waste Printed Circuit Board

    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

  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    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, am-

  • The selective leaching of copper from a gold–copper

    gold leaching either using the same process at elevated temperature (40–60 °C), as patented by the authors, or using a cyanidation process. Copper selective leaching will reduce the gold losses due to a cementa-tion mechanism of gold in the presence of metallic copper as all of the metallic copper will dissolve in the pre-leaching stage.

  • Removal of copper from automobile scrap. 2nd Report

    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.

  • CA1153984A Ammonia leaching Google Patents

    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

  • The Effect of Leaching Time and Ammonia Concentration on

    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

  • [PDF] Gold leaching by copper(II) in ammoniacal

    Gold leaching in thiosulphate media has attracted renewed interest of many researchers over the last three decades due to fast kinetics in the presence of some oxidants/ligands and its adaptability to gold ores which are unsuitable for direct cyanidation. The acidity (pH) and the concentrations of copper(II), ammonia, thiosulphate and polythionates produced by the reaction between copper(II