XRD and Synchrotron-Based XRD Study of Chalcopyrite ...

2020-2-12 · Silver ion can effectively improve the bioleaching efficiency of chalcopyrite, and the mechanism of the process is still in controversy. In this study, leaching experiments, X-ray diffraction (XRD), and synchrotron radiation X-ray diffraction (SR-XRD) were conducted to investigate the intermediate of chalcopyrite in chemical leaching and ...

Chalcopyrite Nitrogen Roast & Leaching Electrowinning

2021-1-5 · Gold, Silver, and Molybdenum. Gold, silver, and molybdenum are concentrated in the residue from the spent electrolyte leach. Following extraction of the elemental sulfur from the residue, the weights of the gangue materials plus molybdenite correspond to 3.5, 10, and 13 percent of the AC-3, PC-3, and RC-1 concentrate weights, respectively.

2002-The effect of silver-bearing catalysts on bioleaching …

2015-4-2 · AbstractThe effect of silver ion, silver sulfide and silver-bearing concentrate (Ag–C) on the bioleaching of chalcopyrite has been investigated. It has been found that the addition of silver-bearing catalyst greatly enhanced copper dissolution from ...

Influences of silver sulfide on the bioleaching of ...

For example, for the leaching of the chalcopyrite ore tested in the present study a silver addition of 0.02 g/L resulted in 25% copper extraction in 10 days, whereas 0.05 g/L Ag resulted in over ...

Catalytic effect of silver-bearing solid waste on …

2020-6-10 · Silver ion can be useful in improving chalcopyrite bioleaching efficiency. In this work, leaching kinetics of this process was investigated using silver-bearing solid waste under different chalcopyrite/solid waste ratios. Bioleaching behavior indicates that silver-bearing solid waste can enhance the bioleaching process, and the redox potential is much higher than the proposed …

Common Silver Extraction Methods

2019-6-18 · The common extraction process is to enrich silver into lead, zinc, and copper concentrates, and then extract silver by smelting. However, in the smelting process, the silver in the lead concentrate enters the crude lead with the main metal, the silver in the copper concentrate enters the matte.

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

2018-8-11 · A 98% gold extraction and 95.7% silver extraction was realized as compared to 92.5% and 7.1% gold and silver extraction, respectively, under the best pressure leach conditions without a lime boil. X-ray diffraction analysis of the pressure leach residues …

RESPONSE SURFACE METHODOLOGY (RSM) FOR …

2017-10-5 · chalcopyrite, copper extraction, silver-coated pyrite, optimization, response surface methodology Introduction Chalcopyrite is the most important copper bearing mineral accounting for about 70% of the world copper reserve (Wang, 2005). Presently chalcopyrite ores are

Steps Of Extraction Of Copper From Chalcopyrite

Steps Of Extraction Of Copper From Chalcopyrite. We have copper is extracted from the ore chalcopyrite,extraction of copper from sudic ores, either by pyrometallurgy or hydrometallurgy, has various limitations this study, a solvometallurgical process for the extraction of copper from suldic ore minerals chalcopyrite, bornite, chalcocite and digenite was developed by using an organic ...

Biohydrometallurgy of Chalcopyrite

2021-7-29 · Biohydrometallurgy of Chalcopyrite summarizes and discusses the reported research findings. In addition, this book publishes the related results found by the authors'' research. Then, the dissolution mechanism of chalcopyrite in bioleaching is interpreted. Finally, the process intensification techniques of chalcopyrite bioleaching are provided ...

Optimization of selective copper extraction from ...

2019-7-27 · The dissolution of copper and iron from chalcopyrite concentrate in the presence of ammonium persulfate (APS) and ammonium hydroxide was investigated under atmospheric leaching conditions. Experiments were designed by central composite design (CCD). Under the optimum leaching conditions ((NH4)2S2O8 concentration = 328 g/L; NH4OH addition = 16vol%; leaching temperature = …

The Effect of Silver Ion Catalysis on Bioleaching of ...

The bioleaching effect of different concentrations of silver ion catalysis on chalcopyrite tailings has been investigated in shaking flasks. In this paper, A.t ferrooxidans were selected for conducting the bioleaching process. Experiments were carried out under the condition of pulp density 150 g/L, inoculation amount 106~7 cells/mL, pH around 2.0, culture temperature 30°C, rotation speed 150 ...

Silver catalyzed bioleaching of low-grade copper ores ...

2008-9-26 · extraction from chalcopyrite around 1×10−3 M. On the contrary, higher silver amounts significantly slow down the rate of reaction by the formation of a thick Ag 2S film that completely seals the chalcopyrite surface. The suppression of chalcopyrite dissolution at high silver concentrations has also been interpreted as due

Co-Bioleaching of Chalcopyrite and Silver-Bearing Bornite ...

Chalcopyrite and bornite are two important copper minerals, and they often coexist. In this study, the co-bioleaching of chalcopyrite and silver-bearing bornite by mixed moderately thermophilic culture at 50 °C was investigated. The bioleaching results show that the …

Selective Separation of Metallic Phases from Chalcopyrite ...

2016-5-16 · Silver is an important by-product of copper extraction therefore it was necessary to study its path during the reduction of chalcopyrite. This was achieved by additions of

(PDF) Catalytic effect of silver-bearing solid waste on ...

Silver ion can be useful in improving chalcopyrite bioleaching efficiency. In this work, leaching kinetics of this process was investigated using silver-bearing solid waste under different ...

(PDF) Combined effect of silver ion and pyrite on AMD ...

Chalcopyrite is a crucial contributor causing acid mine drainage (AMD). Silver and pyrite are commonly co-existed with chalcopyrite, and can significantly affect the copper release from ...

Recovery of Silver, Gold, and Lead From a Complex …

gold-silver ores. A procedure to extract silver from sulfide ores with FeC13 was patented by Hey in 1922 (6). Considera­ ble work was completed by-Wong (7) to re­ cover lead from a galena concentrate with a combined FeC13-NaCl leach solution. Because both lead …

A conceptual process for copper extraction from ...

2017-7-1 · The extraction of copper from "as-received" chalcopyrite flotation concentrate, at a particle size of −45 μm, in solutions containing 0.4 M glycine at …

Copper leaching from chalcopyrite concentrates

The bioleaching results show that the extraction percentage of Cu for co-bioleaching of chalcopyrite (Ccp) and silver-bearing bornite (Bn) (Ccp/Bn = 3:1) was 94.6%.

(PDF) Co-Bioleaching of Chalcopyrite and Silver-Bearing ...

2017-12-26 · The bioleaching results show that the extraction percentage of Cu for co-bioleaching of chalcopyrite (Ccp) and silver-bearing bornite (Bn) (Ccp/Bn = 3:1) was 94.6%.

A new reaction model for the catalytic effect of silver ...

2002-3-1 · Copper extraction from chalcopyrite was enhanced at redox potentials of solutions below a critical value and the critical potential rose with increasing amounts of silver ions added. This result can be interpreted by a reaction model which assumes the formation of intermediate Cu 2 S due to chalcopyrite reduction at low potentials and the ...

A comprehensive utilization of silver-bearing solid wastes ...

2017-5-1 · Silver extraction of bioleached ZLR was significantly higher than that of untreated ZLR when thiourea concentration was low (less than 0.3 mol/L) and a final silver recovery of about 90% can be achieved from the bioleached ZLR. It can be more obvious to be found that silver extraction of bioleached waste firebrick was remarkably higher than ...

Cooperative extraction of metals from chalcopyrite by bio ...

Abstract Chalcopyrite bio-dissolution plays an important role in the processing of copper sulfide ores. However, due to the slow dissolution rates of CuFeS2, bio-dissolution processes have not yet found widespread application. In order to enhance the dissolution of chalcopyrite, a novel method for enhancing the dissolution using ozone was proposed and verified.

Extraction Of Copper | Mining, Concentration, Smelting ...

The major steps in the extraction of copper are. Copper in Chalcopyrite is reduced to copper sulphide. Just like in Blast Furnaces, calcium carbonate is added as a flux to create the slag. Iron in Chalcopyrite is removed as iron silicate slag. Most of the …

David Dreisinger

"The mechanism of chalcopyrite leaching in the presence of silver-enhanced pyrite in the Galvanox™ process". Hydrometallurgy (2012) 113-114, 122-130. Nazari, G., Dixon, D.G., Dreisinger, D., "The role of galena associated with silver-enhanced pyrite in the …

The development of an effective technology for heap ...

2018-3-16 · Experiments at varied silver concentrations showed that there is a minimum concentration of silver needed to achieve a significant enhancement in the rate and extent of the extraction of copper. For example, for the leaching of the chalcopyrite ore tested in the present study a silver addition of 0.02 g/L resulted in 25% copper extraction in 10

Silvermine, Extraction of Silver, Silver Recovery, Silver ...

Silver flotation process of Xinhai includes three kinds of methods: flotation, flotation &gravity separation, flotation &cyaniding, while the flotation & cyaniding method is the most important process among the whole, silver concentrate can be get in the process …

New approaches for extracting and recovering metals from ...

2017-5-15 · Silver has long been recognised to enhance the bioleaching of chalcopyrite, and has in the past been added to facilitate this process (e.g. Romero et al., 2003). Copper concentrates sometimes contain sufficient silver to catalyse the oxidative dissolution of chalcopyrite, even at relatively low temperatures ( Johnson et al., 2008 ).

A Review on Novel Techniques for Chalcopyrite Ore …

2012-1-1 · In the chemical stage, chalcopyrite concentrate are leached with ferric sulfate at 12 g/L and pH 1.25 in the agitated reactors using silver as a catalyst. Higher copper extraction (>95 % wt) is obtained by activating concentrates with 2 mg Ag/g of concentrate at 70 o C and 10 hours leaching (Dresher, 2004). 2.2.2.2.5. The Biocop (TM) Process