The article presents the research results for the effectiveness of copper extraction from ores of the Satpayev deposit with complex, mixed composition bacterial leaching. The experiments with pre-acidification of copper samples were performed using biological oxidation by A. Ferrooxidans bacterial culture, adapted strain. Biochemical open-ing moes of mineral raw materials using A. Ferrooxidans bacteria of a particular strain adapted to the copper waste composition and capable of oxidizing sulfide and iron-bearing minerals were worked out. The optimal growth conditions for microorganisms in copper mineral pulp medium were established (temperature, pH, S: L.) The highest leaching efficiency, up to 88.65%, was observed in the experiments with preliminary bio-oxidation of samples by A. Ferrooxidans bacterial culture.

/pdf/copper-extraction-from-complex-waste-dumps-by-biochemical-15cmap38.pdf

Copper Extraction from Complex Waste Dumps by Biochemical Leaching Method

The article presents the results of experiments intended to leach copper from ore heaps of complex mineral composition biochemically. The processing of such heaps is complicated due to the presence of oxidized copper minerals among significant fragments of sulfide minerals and iron-calcium silicates. This factor does not allow to perform standard sulfuric acid leaching effectively without the use of additional oxidation catalysts, or to apply beneficiation methods for that kind of raw materials. Use of A. Ferrooxidans bacteria adapted to the composition of the copper dump, as a bio-catalytic agent, significantly accelerates the leaching process and increases the copper recovery degree into the productive solution.

Intensification of copper leaching from heaps using biological oxidation

This paper provides an overview of hydrometallurgical copper extraction studies in which liquid extraction technology has been used with four copper deposits of different compositions. The sulfuric acid consumption rate and copper extraction efficiency, which are dependent on the initial content and forms of calcium compounds and other impurities in ore samples, were calculated, and the results are presented herein. It was established that during the leaching process, silicate compounds of alkaline earth metals, in addition to calcium and magnesium carbonate compounds, would affect the levels of sulfuric acid consumption, thereby actively lowering the acidity of the environment. Moreover, these compounds could partially sorb copper ions from sulfuric acid leaching solutions. Thus, the analysis of waste ore samples showed that residual copper is mainly contained in the form of complex silicate complexes. The presence of divalent iron compounds in the composition from one of the deposits also allowed us to perform a biochemical leaching experiment with preliminary oxidation using an Acidithiobacillus ferrooxidans bacterial culture adapted to the ore composition. The use of this biochemical method in the copper leaching process resulted in a significant reduction in sulfuric acid consumption, by 40%, and a copper recovery rate of 87.2%.

/pdf/study-of-factors-affecting-the-copper-ore-leaching-process-2amry6m3.pdf

Study of Factors Affecting the Copper Ore Leaching Process

Study on Iron Extraction from High Iron Bauxite Residue by Pyrite Reduction

The invention discloses a photoelectric energy method for promoting the biological metallurgical leaching rate of microorganisms Ar4. The invention provides an application of photoelectron catalysis or external constant potential electrons in improving a leaching rate of target metal or target metal ions leached from sulfide metal ore by using Metallospharomyces acidophilus sp. Ar4CGMCC NO.3402 ora culture thereof or a fermentation product thereof or a suspension thereof. According to the photoelectric energy method for promoting the biological metallurgical leaching rate of the microorganisms Ar-4, under the catalytic action of simulated photoelectrons, the leaching rate of the M.cuprina Ar4 to copper ions and iron ions in the chalcopyrite is increased, and the good biological metallurgical capacity is achieved.

Photoelectric energy method for promoting biological metallurgical leaching rate of microorganisms Ar-4

Catalytic Effects of Red Mud and Acidithiobacillus ferrooxidans on Biodissolution of Pyrite

The invention discloses a method for enhancing photocatalytic semiconductor sulfide mineral bioleaching by jarosite and belongs to the technical field of bio-metallurgy. Under the conditions of adding0.1-6g/L biosynthetic jarosite and visible light with the light intensity of 4000Lux-12000Lux, semiconductor sulfide minerals are leached by acidophilic iron sulfur oxidizing bacteria. The bioleaching efficiency of the semiconductor sulfide minerals is improved obviously. Under the combined action of the visible light and the jarosite, the leaching rate of the semiconductor sulfide minerals is 33.5-35.7% higher than that of a control group without jarosite under dark conditions. The method can obviously improve the leaching rate of the semiconductor sulfide minerals, so that bioleaching technology has great significance when applied to the field of resource processing.

Method for enhancing photocatalytic semiconductor sulfide mineral bioleaching by jarosite

The invention discloses a method for promoting bioleaching of semiconductor sulfide ore by synergism of cadmium ions and visible light, and belongs to the technical field of biological metallurgy. Thebioleaching efficiency of chalcopyrite can be remarkably improved by leaching semiconductor sulfide ore, such as chalcopyrite, through acidophilic thiobacillus ferrooxidans in the presence of cadmiumions not more than 100mg/L and visible light. Under the combined action of visible light and cadmium ions not more than 100mg/L, the leaching rate of chalcopyrite is increased by 7.0-14.7% compared with that of the control group without adding cadmium ions in the dark condition. The method can obviously improve the leaching rate of the semiconductor sulfide ore, so that the application of the biological leaching technology in the field of resource processing has great significance.

Method for promoting bioleaching of semiconductor sulfide ore by synergism of cadmium ions and visible light

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Catalytic Effects of Red Mud and Acidithiobacillus ferrooxidans on Biodissolution of Pyrite

Method for enhancing photocatalytic semiconductor sulfide mineral bioleaching by jarosite

Method for promoting bioleaching of semiconductor sulfide ore by synergism of cadmium ions and visible light