Conversion of chalcopyrite to copper oxide in hypochlorite solution for selective leaching of copper in dilute sulfuric acid solution: Tendekayi Tapera · Jake Sheean · Aleksandar N. Nikoloski · Aleksandar N. Nikoloski Development of BIONORD® technology on Olimpiada deposit refractory arsenic-gold ores treatment in conditions of Extreme North
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Selective leaching of copper and zinc from primary ores and secondary mineral residues using biogenic ammonia Adam J. Williamson a, e, *, Florian Verbruggen a, Vania S. Chavez Rico a, Jef Bergmans c, Jeroen Spooren c, Lourdes Yurramendi d, Gijs Du Laing b, Nico Boon a, *, Tom Hennebel a
There was a high 98% of selective recovery of the leached Cu (as copper sulfide) at a copper/sulfide molar ratio of 1:3, initial pH 1.0–2.0, and with 100 ppm of ferric sulfate concentration. Copper could be selectively precipitated as copper sulfide, which can be further pyro/hydrometallurgically processed to produce Cu metal.
SELECTIVE LEACHING FOR THE RECOVERY OF COPPER FROM PCB Md Fazlul Bari*, Mst. Noorzahan Begum, Shamsul Baharin Jamaludin, Kamarudin Hussin School of Materials Engineering, University Malaysia Perlis, 02600 Arau,Malaysia Abstract This paper reported on the leaching behavior of printed circuit board (PCB) using a new
...from Leaching Solution of Copper Smelting Ash. Recovery of Copper from Leaching Solution of Copper Smelting Ash_ 【】Selective leaching of chromium-containing s... Selective leaching of chromium-containing slag by HCl_。 JCetSuhUnvTcn1(081:2—2 .n.ot ieho.20) 8489.5DoI1.07s17-0-122: ...
Copper minerals are often associated with gold ores. These create processing problems since cyanide solutions are not selective for gold alone. Copper minerals are also leached by cyanide, and typically each one per cent of `reactive' copper in the ore consumes about 30 kg t 1 cyanide. Once in solution, copper cyanide species create further processing problems as they adsorb onto carbon along ...
In addition, with the addition of ascorbic acid as reducing agent, copper extraction showed decrease, opposite to Co and Li. Based on this, we propose a new method for the selective leaching of battery metals Co and Li from the industrially crushed LIBs waste at high solid/liquid ratio (S/L) that leaves impurities like Cu in the solid residue.
A selective acid leaching process was then used to recover the copper content of the residue after filtration. In the second stage, an additional 1 N of sulphuric acid was added to the suspension in the selective leaching process, and the pH value was controlled at 1.5-2.0. The reagent sodium hydroxide (2 N) was used as leachate at a pH greater ...
Selective leaching of copper minerals from copper-gold concentrates is demonstrated using alkaline glycine solutions. 98% of total copper dissolved in 48 hours at room temperature. of chalcocite, cuprite, metallic copper, and about 80% of chalcopyrite dissolved in 48 hours. The effects the no. of leach stages, pH, oxidant and glycine ...
The most challenging issue associated with recycling the sludge generated from printed circuit boards (PCBs) is the separation of copper (Cu) from iron (Fe), using multi-stage leaching, or adding oxidizing and precipitating agents. Herein we investigated simple acid leaching to effectively extract copper and limit iron dissolution. Selective copper leaching was achieved with all the acids ...
Senanayake, G. (2005) Role of copper(II), carbonate and sulphite in gold leaching and thiosulphate degradation by oxygenated alkaline non-ammoniacal solutions. Minerals Engineering, 18 (4). pp. 409-426. Senanayake, G. (2005) The role of ligands and oxidants in thiosulfate leaching of gold.
A solvent extraction application consisting of three-sequential solvent extraction steps to selectively recover the copper and cobalt from carrollite leach solution was conceived and experimentally explored. The first step allowed the simultaneous extraction of 95.5% copper, 0.87% cobalt and 4.79% iron using 20% Lix984 in sulfonated kerosene and O/A ratio of 1 at initial pH of 2.
The selective leaching of copper from a gold–copper concentrate in glycine solutions Hydrometallurgy, 150 ( 2014 ), pp. 14 - 19, 10.1016/j.hydromet.2014.09.005 Article Download PDF View Record in Scopus Google Scholar
Copper selective leaching will reduce the gold losses due to a cementation mechanism of gold in the presence of metallic copper as all of the metallic copper will dissolve in the pre-leaching stage. Nguyen et al., 1997a, Nguyen et al., 1997b found that, at ambient conditions and pH 11, all gold in a solution containing 1000 mg/L NaCN and 0.5 g ...
A selective leaching process was followed to recover the copper content of the ferrite complex. To promote the dissolution percentage of copper and repress that of iron, additional 0.5 N sulfuric acid was added at intervals to the suspension in the second step of the selective leaching …
Copper mineralization in the ultrabasic complex of Nuggihalli, Hassan district, Mysore State. 3. ... A simple and rapid selective leaching technique for the determination of uranium and Sulphide, Sulphur in the borehole samples of Gogi village, Gulbarga district, Karnataka, India. Pro.
This paper reports on the leaching behavior of printed circuit board (PCB) using a new leaching agent of ammonia-ammonium persulfate, to recover copper. The best leaching efficiency was found to be around 99% cu, 60% Zn and 9% Ni with 5M ammonia, 0.5M ammonium sulfite concentration. The leached solution was subjected for electrowining to recover Cu.
A method for selective oxygen pressure leaching of precious metal enrichment using nickeliferous material with high iron and copper contents. The method comprises: purification and impurity removal, atmospheric pressure leaching, oxygen pressure iron removal, oxygen pressure nickel immersion and oxygen pressure copper immersion. With short technological process and high direct yield, the ...
A novel application, including mechanochemical pre-treating and alkali leaching, for arsenic selective leaching from copper smelter flue dusts (CSFUs) was developed to overcome the disadvantages of hydrometallurgical methods. Compared with raw CSFU powders, the mechanical-activated ones showed higher maximum arsenic leaching efficiency (increased by ~20%), and lower apparent activation …
Mixtures of ammonia and cyanide at low concentrations leach gold selectively from copper-gold ores. The effects of various reagent compositions on three different ore types containing between 0.3 - 1.5 per cent Cu are reported. It is shown that the results and optimum compositions vary according to the ore, which is attributed in part to the mineralogy and adsorption of solution species on the ...
An alternative selective leaching process for copper minerals from copper-gold gravity concentrate (3.75% Cu, 11.6% Fe, 11.4%S and 0.213% Au) using alkaline glycine solutions was studied and ...
agents are effective for selective leaching.1–6) Majima et al. 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
The dissolution of copper sulphide ores continues to be a challenge for the copper industry. Several media and leaching alternatives have been proposed to improve the dissolution of these minerals, especially for the leaching of chalcopyrite. Among the alternatives, pretreatment prior to leaching was proposed as an option that increases the dissolution of copper from sulphide ores. In this ...
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A novel application, including mechanochemical pre-treating and alkali leaching, for arsenic selective leaching from copper smelter flue dusts (CSFUs) was developed to overcome the disadvantages of hydrometallurgical methods. Compared with raw CSFU powders, the mechanical-activated ones showed higher maximum arsenic leaching efficiency ...
copper sulfide minerals.1 With the gradual depletion of chalcopyrite-dominant copper ores, more and more chalco-cite-dominant copper ores with a high pyrite content are treated. However, in the middle and later periods of bioleaching of copper ores, iron ions in the leaching solution tend to accumulate rapidly.2 This problem increases the
low tonnage sales compared with high tonnage metals, such as iron, copper, nickel, lead, tin, zinc, or light metals, such as aluminium, magnesium, or titanium and electronic metalloid silicon. Rare processing includes biometallurgy, hydrometal-lurgy, electrometallurgy, supercritical …
), making it a more suitable reductant in the selective leaching of Li, Co, Ni, and Mn over Cu and Al (Peng et al., 2018; Wu, 2007). The selective leaching of Li, Ni, Mn and Co will leave a residue with high Cu and Al content, which can potentially be used as a …
The selective leaching of copper from the copper smelting slag by the oxygen pressure leaching process at low acidity was feasible. This leaching could transform over 99 wt% of iron in copper smelting slag into the hematite phase, with a high recovery rate of iron and no sulfur dioxide or greenhouse gases generated in the process.