Leaching-ore bacteria and high temperature heap bioleaching process for chalcopyrite ore by using the same

Abstract

The invention relates to mineral leaching bacteria and a biological high-temperature heap leaching technique of native copper sulfide ore that uses the leaching bacteria. The leaching bacteria are preserved in China Center for Type Culture Collection in Wuhan University, and the preservation numbers are respectively CCTCC NO of M207062, M207063, M207064 and M206029. The heap leaching technique roughly smashes the native copper sulfide ore, finely smashes the native copper sulfide ore, and preprocesses the native copper sulfide ore by spraying a bacteria-containing solution, thus obtaining ore particles that are suitable for biological leaching. The ore particles are processed by working procedures of stacking, heap leaching and spraying, leaching liquid recycling, copper-rich liquid extracting, back extracting and electrodeposition and the like, thus obtaining marketable cathode copper. The heap leaching process adopts a method that includes room temperature bacteria, medium thermophiles and extreme thermophiles and realizes the bacteria-containing spraying operation in phases, thus gradually raising the internal stack temperature. Finally the stock dump temperature is preserved between 10 DEG C and 80 DEG C, pH value is preserved between 1.2 and 1.8, and proper Fe concentration is beneficial to preserve the activity of the mineral leaching bacteria. The biological high-temperature heap leaching technique can completely utilize the low-grade native copper sulfide ore resources in old mines, raises the synthetic mine utilization level, saves cost and increases profits. The biological high-temperature heap leaching technique of native copper sulfide ore that uses the leaching bacteria is applicable to existing domestic low-grade native copper sulfide ore of old mines and the copper ore resource exploit in remote areas of western highlands that mainly aims at exploiting native copper sulfide ore.

Description

technical field [0001] The invention relates to ore leaching bacteria and its high-temperature biological heap leaching process for primary copper sulfide ore. It mainly uses the ore leaching microbial community with iron oxidation performance and sulfur oxidation performance, and adjusts the microbial oxidation performance in the leaching heap through heap leaching technology operation to achieve Efficiently dissolve primary copper sulfide ore and fully recover metallic copper in the ore. This process is an energy-saving, environmentally friendly and efficient extraction technology for copper resources in primary copper sulfide ores. Background technique [0002] my country is an important copper consumer, a copper processing and manufacturing base and an exporter of copper basic products in the world. However, my country is a country with a relative shortage of copper resources, and the self-sufficiency rate of raw materials for refined copper is seriously insufficient. ...

AI Technical Summary

Problems solved by technology

Among the proven primary copper sulfide ore resources in China, most of them are remote and low-grade primary copper sulfide ores. In addition, there are also a large number of waste ores below the cut-off grade of traditional separation technology in old mining areas. The above-mentioned copper resources adopt the existing The traditional dressing and smelting technology or process development has no economic benefit or very poor economic benefit

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