Method of preparing high purity copper by bacteria leaching primary sulfide ore

Abstract

The invention relates to a method of preparing high pure copper from the leachate of primary sulfide ore bacteria, including: it leaches the primary sulfide ores and its mixture by using the mixture of middle and mesophilic bacterias. It filters and extracts the bacterial leaching solution, and conducts thin-layer wash-condensate, coalescence phase, and back-extraction electrowinning for the organic phase load. The invention uses hybrid strains of bacteria and sub-culture techniques to enhance the synergy of the bacterial leaching role and the minerals leaching rate, uses gelatin and other additives without sulfur element to reduce the sulfur impurities.

Description

technical field [0001] The invention relates to a method for preparing high-purity copper with a percentage of more than 99.999%, which is suitable for bacterial leaching of primary sulfide ore, and belongs to the technical field of biometallurgy. Background technique [0002] The preparation of high-purity cathode copper is divided into two technical routes: pyrometallurgy and hydrometallurgy. [0003] When preparing high-purity copper by pyrometallurgical process technology, it is generally necessary to grind ore and beneficiate to obtain concentrate, and then undergo pyrometallurgical smelting to make anode copper (crude copper), and the anode copper is further electrolyzed to make 4N (99.99%) cathode Copper, 4N cathode copper is made into higher purity copper through various methods. At present, the main production technologies for purifying 4N (99.99%) cathode copper to 5N-8N cathode copper include area smelting and solution technology. Among them, the solution purifi...

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Problems solved by technology

However, the concentration of copper ions in the bacterial leach solution is generally 0.3-1.5g / L, and the peptized impurities are difficult to be naturally clarified in the effusion reservoir, and the shear force generated by the extraction and stirring will form "water-in-oil" microbeads, which make the extraction exist to a certain extent. Instability and extraction entrained impurities

These impurities enter the stripping process, and finally the impurities are recycled and accumulated, which affects the further improvement of the cathode copper quality, increases the treatment capacity of the electrowinning liquid and the loss of high-value cobalt; the thiourea additive in the electrolytic liquid is the sulfur impurity in the cathode copper product One of the main sources of thiourea additives limits the reduction of impurity sulfur in cathode copper

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