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Oct 01, 2017· The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%.
A hydrometallurgical process was developed for recovery of copper from copper-lead matte formed as an intermediate product at the BHAS lead smelter at Port Pirie. A plant utilizing this process was commissioned in 1984. The leach step involves oxidation of the copper-lead matte in an oxygenated acidic chloride-sulphate leachant. The results of laboratory scale testwork...
Recovery Of Silver From Lead Zinc Flotation Tailings By Thiosulfate Some Solutions. Waste water and resource recovery view section section 3 removal of cadmium copper nickel and zinc from aqueous solution by adsorption effect of lead ion and minerals on thiosulfategold leaching high pressure leaching of pgm flotation tailings in chloride and nltric acid media view section 100
A series of laboratory tests undertaken by Thomas et al. (2013), using up to 60% copper tailings as part of sand, showed that the performance of concrete mixes designed at water/cement ratios of 0.40, 0.45 and 0.50 improved with the use of copper tailings up to 30% for compressive strength, flexural strength, pull-off strength, drying shrinkage ...
A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90°C and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ...
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. The addition of 12M sulfuric acid reverses ...
Leaching of copper from tailings using ammonia/ammonium chloride solution and its dynamics 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
increased selectivity of gold leaching over copper. The rate of gold leaching in this system is, however, apparently slower than that with free cyanide and the use of ammonia has its own occupational health and environmental concerns; within Australia, ammonia is also .
Guo-dong, L. Qing, Leaching of copper from tailings using. ammonia–ammonium chloride solution and its dynamics. Inter-national conference on chemistry and chemical engineering
The experiments of agitation leaching were carried out in aqueous ammoniaammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper
Leaching of copper, zinc or molybdenum oxides, is of this type. Oxidative method: In this method, leaching requires the use of an oxidizer to oxidize solids such as metals or sulfide minerals.
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 of ammonia, solid/liquid ratio and temperature were investigated.
Calcium chloride (CaCl2) roasting and nitric acid (HNO3) leaching were combined to remove uranium and radioactivity from uranium tailings. The results show that the uranium and gross α and β radioactivity removal efficiencies improve with increasing CaCl2 addition and HNO3 leaching time and reach maximum values of 81.5%, 87.9% and 86.5%, respectively, after roasting with 50% CaCl2 for 120 ...
Oct 25, 2018· With decreasing ore grades, the tailings of mining operations are becoming of increasing interest as metal-containing secondary raw materials. The objective of the current work was to investigate chloride leaching of gold, copper, cobalt, nickel, and zinc present in the flotation tailings. In the current study, the effect of cupric ion as an oxidant (0–50 g/L) and NaCl (150–250 g/L) on ...
applied for chemical chloride leaching to extract gold and copper into the solution. In chloride leaching, the highest extractions of copper and gold were 98% and 63%, respectively. In addition, residual nickel, cobalt, and zinc were dissolved into the solution with the extraction of 99%, 80%, and 90%, respectively. In all chloride
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, ammonium sulfate and sodium persulfate, temperature, particle size and stirring speed on the leaching rate of low-grade copper ore in ammonia- ammonium sulfate solution are interpreted. 2 Experimental 2.1 Materials The oxidized copper ore from Yunnan province in China was ground into different particle sizes of 0.037,
In the present study, the effects of concentrations of ammonia, ammonium sulfate and sodium persulfate, temperature, particle size and stirring speed on the leaching rate of low-grade copper ore in ammonia- ammonium sulfate solution are interpreted. 2 Experimental 2.1 Materials The oxidized copper ore from Yunnan province in China was ground ...
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 .
Moreover, in chloride leaching, the formation of chloride complexes with different valuable metals makes it easier to achieve a comprehensive recovery of metals in tailings. Many experimental investigations have been carried out on silver recovery from silver-bearing wastes through chloride leaching ( Yazici and Deveci, 2015, Zhang et al., 2012 ).
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 ...
The leaching behaviour of BHAS copper matte in oxygenated acidic sulphate chloride solutions at 85°C has been studied using samples containing 34% copper, 41% lead and 12% sulphur. Copper sulphide in the matte, essentially Cu2S was found to leach in two distinct stages. Similar to the behaviour of pure chalcocite, copper dissolution in the first...
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.
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper .
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