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

Abstract

The invention relates to a method for efficiently recovering copper from low-grade secondary copper sulfide ore. The method comprises the following sequential process steps and conditions that (1) classification is performed, specifically, the low-grade secondary copper sulfide ore is classified into copper ore and copper-containing waste stone according to industrial boundary grades; (2) coarse grinding, semi-autogenous grinding and screening are performed, specifically, conventional coarse grinding, semi-autogenous grinding and screening are performed on the copper core in sequence, and high-grade copper ore under a sieve and hard stone on the sieve are separated; (3) ball-milling and floatation are performed, specifically, conventional ball-milling and floatation are performed on the high-grade copper ore in sequence, and the product copper concentrate is obtained; (4) heap bioleaching is performed, specifically, the hard stone serves as a heaping-up framework for the screened-out copper-containing waste stone, and conventional heap bioleaching is performed after the copper-containing waste stone and the hard stone are mixed uniformly, and lixivium is separated; and (5) extraction and electrodeposition are performed, specifically, conventional extraction and electrodeposition are performed on the lixivium, and the product cathode copper is obtained. By means of the method provided by the invention, valuable metal such as copper can be comprehensively recovered from the ore without any industrial mining value, the production cost can also be lowered, the advantages of thegreat economic, ecological and social benefits are manifested, and the method is applicable to mining application.

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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