Contact Us

C o n t a c t U s

Leaching of copper from tailings using

The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and

Leaching of copper from tailings using

The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated.

Leaching Of Copper From Tailings Using Ammonia

Leaching Of Copper From Tailings Using Ammonia . Leaching of copper from tailings using ammonia/ammonium. Aug 03, 2010 Abstract: The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied The tailings belong to a low-grade and high-alkaline copper ore The effect of leaching time, the concentration

(PDF) Ammonia Leaching: A New Approach of Copper

Leaching of copper from tailings using. malachite ore in ammonium chloride solutions has been investigated with respect to the effects of ammonium chloride concentration, particle

Ammonia Leaching: A New Approach of Copper Industry

2013-12-10  Z. Guo-dong, L. Qing, Leaching of copper from tailings using ammonia–ammonium chloride solution and its dynamics. International conference on chemistry and chemical engineering (ICCCE) (2010) 12. V. Radmehr, Determination of suitable parameters of ammoniacal column leaching for meskani mine copper

AMMONIA LEACHING IN THE COPPER INDUSTRY: A

ammonia/ (ammonium chloride leaching time, the concentration of ammonia, solid/liquid ratio and temperature 75 Guo-dong and Qing, 2010) Dissolution kinetics of low grade complex copper ore in

Use of Ammonia Salts in Selective Copper Extraction from

2020-6-3  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 22.5% NH4OH and 100 g/L (NH4)2S2O8, 91.47% of the copper was transferred into the solution, while

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

L eaching of copper from tailings us ing ammonia/ammonium chloride solution and its dynamics, International Conference on Chem istry and Chemical Engineering (ICCCE

COPPER(II) EXTRACTION FROM AMMONIA LEACH

2013-9-7  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

Leaching Kinetics of Willemite in Ammonia-Ammonium

2011-2-23  The leaching kinetics of willemite in ammonia-ammonium chloride solution was investigated. The effects of the ammonia-ammonium ratio, particle size, temperature, and total ammonia concentration on the leaching rate of willemite were determined. The results show that the optimum ammonia-ammonium ratio is 1:2 over the studied range. The zinc extraction increases with the reduction of particle

Ammonia Leaching: A New Approach of Copper Industry

Leaching of copper from tailings using ammonia–ammonium chloride solution and its dynamics Ammonia– ammonium chloride Leaching time, the concentration of ammonia, solid/ liquid ratio and

Recovery of Copper from Ammoniacal Leachates by Ion

2021-4-27  Leaching with ammonia and ammonium salts, also known as ammoniacal leaching, is a hydrometallurgical process to extract copper and zinc very selectively from Cu–Zn–Pb sulfidic tailings, with respect to iron and lead . Ammonia and ammonium salt

Chalcopyrite leaching in ammonium chloride solutions

2021-8-15  As shown in Fig. 1(a), the initial addition of Cu(II) significantly increased copper leaching rate from chalcopyrite in 2 mol/L ammonium chloride solutions under constant pH of 8.5 and naturally aerated conditions. Without Cu(II) addition, copper dissolution displayed a lag trend during the initial dissolution period. Less than 5% of copper was released from chalcopyrite within the first 5 days.

Selective leaching of copper and zinc from primary ores

2021-2-5  Abiotic factors (ammonia speciation and pH) were assessed by using different synthetic ammonia species on copper leaching from the ASR using 1 mol L −1 total ammonia. NH 4 Cl and NH 4 OH were added as pure solutions, whilst for pH modifications, NH 4 HCO 3

Leaching of Trace Amounts of Metals from Flotation

2019-3-20  Leaching of Trace Amounts of Metals from Flotation Tailings in Cupric Chloride Solutions The objective of the current work was to investigate chloride leaching of gold, copper, cobalt, nickel, and zinc but also other valuable metals from flotation tailings by cupric chloride leaching. Experiments were conducted to

An investigation of aggressive leaching of Uitkomst

2015-3-4  leaching process using sulphuric acid, hydrochloric acid and ammonium hydroxide, independently. Leaching process The two materials which were run– -of-mine ore (ROM), sulphide-nickel ore, and its tailings were examined. What is interesting is, most of operations utilize sulphuric acid leaching

Dissolution Potential of a Nigerian Complex Covellite Ore

2020-7-9  Leaching studies Effect of ammonia/ammonium chloride (NH 3/NH 4Cl) concentration The effects of ammonia/ammonium chloride concentration (0.05 0.6 mol/L) on the extent of covellite ore dissolution at 55°C at various leaching times with moderate agitation were examined. The fraction of the ore reacted at various leaching times plotted for

Extraction of Zinc from Smithsonite by Ammonia Leaching

2020-1-8  by ammonia leaching on cerussite flotation tailings. Initial lead and zinc grades of the ore were 13.31% and 27.86%, respectively. As a result of a series of cerussite flotation tests, a lead concentrate containing 63.25% Pb was produced with 82.76% recovery. After that, tailing of flotation was treated with ammonia (NH 3) to extract zinc.

Leaching Solution an overview ScienceDirect Topics

The CENIM-LNETI process [42, 43] is based on oxidation leaching in concentrated solutions of ammonium chloride, using oxygen. The process includes leaching of metals (Cu, Zn, Pb and Ag) together with the production of ammonia and sulphate which are returned to the solution, elemental sulphur, which remain in the leaching

Comparison of various extractants for recovery of Copper

2021-9-7  Solvent extraction of copper from ammonia solutions proceeds similar to that from acidic solutions. Ammonia ligands are pushed out, and a new chelate complex with hydroxyoxime is formed in the organic phase. Copper extraction from ammonia solution with acidic extractant HA can be described as [20]: 2HA (org) + Cu (NH 3) 2+ 4(aq)

Ammonia Leaching: A New Approach of Copper Industry

2013-12-10  Z. Guo-dong, L. Qing, Leaching of copper from tailings using carbonate compound, commercially adopted in Nicaro in ammonia–ammonium chloride solution and its dynamics. Inter- Cuba, Marinduque in the Philippines and Queensland in national conference on chemistry and chemical engineering Australia [38].

Copper Recovery From Ammonia Solutions Through

2021-1-28  Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( Cu (NH 3) 4 2 +) being the most stable.In order to suppress the unit operation of solvent extraction (SX) and move

Extraction of Zinc from Smithsonite by Ammonia Leaching

2020-1-8  by ammonia leaching on cerussite flotation tailings. Initial lead and zinc grades of the ore were 13.31% and 27.86%, respectively. As a result of a series of cerussite flotation tests, a lead concentrate containing 63.25% Pb was produced with 82.76% recovery. After that, tailing of flotation was treated with ammonia (NH 3) to extract zinc.

Copper-Ammonia Complex Chemdemos

2021-9-16  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.

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. In this research, we tried to investigate the effect of different parameters on ammonia leaching of copper from copper smelting slag by identifying different copper-bearing phases and following them during

Dissolution Potential of a Nigerian Complex Covellite Ore

2020-7-9  Leaching studies Effect of ammonia/ammonium chloride (NH 3/NH 4Cl) concentration The effects of ammonia/ammonium chloride concentration (0.05 0.6 mol/L) on the extent of covellite ore dissolution at 55°C at various leaching times with moderate agitation were examined. The fraction of the ore reacted at various leaching times plotted for

An investigation of aggressive leaching of Uitkomst

2015-3-4  leaching process using sulphuric acid, hydrochloric acid and ammonium hydroxide, independently. Leaching process The two materials which were run– -of-mine ore (ROM), sulphide-nickel ore, and its tailings were examined. What is interesting is, most of operations utilize sulphuric acid leaching

Ammoniacal leaching and recovery of copper from

2019-5-10  Bari et al. [9] also investigated various ammonium salts for copper recovery directly from PCBs and reported the highest leaching efficiency for ammonia–ammonium per-sulfate solution. At optimum conditions, 90 % Cu, 60 % Zn and 9 % Ni were dissolved from the waste in 10 h. Copper

DEVELOPMENT AND IMPLEMENTATION OF SOLVENT

2019-8-7  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 solvent extraction and electrowinning.

Comparison of various extractants for recovery of Copper

2021-9-7  Solvent extraction of copper from ammonia solutions proceeds similar to that from acidic solutions. Ammonia ligands are pushed out, and a new chelate complex with hydroxyoxime is formed in the organic phase. Copper extraction from ammonia solution with acidic extractant HA can be described as [20]: 2HA (org) + Cu (NH 3) 2+ 4(aq)