Method for efficiently recovering copper from low-grade secondary copper sulfide ore

Abstract

The present invention relates to a method for efficiently recovering copper from low-grade secondary copper sulfide ores, which includes the following sequential process steps and conditions: (1) classification: classify low-grade secondary copper sulfide ores into copper ores according to the industrial cut-off grade and copper-containing waste rock; (2) Coarse crushing, semi-autogenous grinding and screening: the copper ore is subjected to conventional coarse crushing, semi-autogenous grinding, and screening in order to separate the high-grade copper ore under the sieve and the stubborn stone on the sieve (3) Ball milling and flotation: the high-grade copper ore is subjected to conventional ball milling and flotation in turn to obtain the product copper concentrate; (4) Biological heap leaching: use stubborn stones as the skeleton of the copper-containing waste rock pile, Mix the copper-containing waste rock and cobblestone and perform conventional bioheap leaching to separate the leachate; (5) Extraction-electrodeposition: The leachate is subjected to conventional extraction-electrodeposition to obtain the product cathode copper. It has the advantages of comprehensively recovering valuable metals such as copper from ores without industrial mining value, reducing production costs, and demonstrating great economic, ecological and social benefits, and is suitable for mining applications.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a method for efficiently recovering copper from low-grade secondary copper sulfide ore, which is suitable for mining applications. Background technique [0002] Copper sulfide ore is mostly recovered by the "crushing-grinding-flotation" process. With the development of large-scale mineral processing equipment, the application of semi-autogenous mills is becoming more and more extensive. The semi-autogenous mill has a large processing capacity and a good working environment, and can better replace the medium and fine crushing processes of the traditional mineral processing industry. During the production process of semi-autogenous grinding, a certain amount of hard-to-break and low-grade ore will be produced, commonly known as "stubborn stone". At present, ore concentrators usually directly return or crush the boulders to the semi-autogenous mill. Although it can redu...

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Problems solved by technology

Bioheap leaching technology has the advantages of low production cost and good economic benefits, but its copper recovery rate is lower than that of flotation process, and it cannot comprehensively recover associated metals such as gold in copper ore

[0004] Therefore, the efficient and economical recovery of copper in low-grade secondary copper sulfide ores cannot be achieved by a single flotation or bioheap leaching process.

For example, a scholar proposed to adopt the process of "high-grade copper ore flotation-low-grade copper ore bioheap leaching", but there are problems such as limited ore processing capacity, high cost of crushing and grinding, and low recovery rate of valuable metals such as copper. , Another example is the Chinese patent CN108514950 A. Wu Zhi and others disclosed "a method for improving the copper recovery rate of copper sulfide ore", which proposed that after semi-autogenous grinding of copper sulfide ore, the stubborn stone of +70mm was crushed by high-pressure roller mill , the part of +0.3mm is bioheap leaching. This process tries to use some stubborn stones to open the way, but the amount of +70mm stubborn stones is very small, and the amount of open way is small, which has little effect on reducing the cost of grinding. Disadvantages such as higher cost, smaller particle size after crushing, and greater difficulty in building piles

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