Low-grade gold ore heap leaching method based on high voltage electropulse crushing

Abstract

The invention relates to a low-grade gold ore heap leaching method based on high voltage electropulse crushing. The method comprises the following steps: firstly, carrying out open circuit coarse crushing and closed circuit intermediate crushing on raw ores until appropriate particle size is reached, and then feeding the raw ores into a high voltage electropulse crushing machine to be treated; secondly, carrying out open circuit fine crushing on the raw ores by adopting the high voltage electropulse crushing machine, and carrying out combined classification on a product by adopting a wet type vibrating screen and classifying equipment; thirdly, feeding a finer overflow product into an all-slime cyanidation leaching system, mixing settled sand, coarse grain materials and appropriate amount of soda lime, then forming an ore heap, and carrying out heap leaching; and fourthly, obtaining golden liquid and tailings after leaching is finished, and adsorbing, desorbing and smelting the golden liquid, so that a gold product is obtained. Compared with the prior art, the method provided by the invention has the advantages that the high voltage electropulse crushing is adopted for treating low-grade gold ores, gold exposure rate of the product is high, fine particle content is low, heap leaching period can be obviously shortened, consumption of a leaching agent is reduced, and gold leaching rate is improved; and a fine-fraction graded product is also recycled while the heap leaching is carried out.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a low-grade gold ore heap leaching method based on high-voltage electric pulse crushing. Background technique [0002] As my country's high-grade metal mineral resources are almost exhausted, the importance of rich low-grade metal mineral resources is becoming more and more prominent. For low-grade gold ores, heap leaching technology is currently one of the most widely used extraction methods. As a liquid-solid reaction process, the efficiency of heap leaching in actual production mainly depends on the exposure rate of gold and the permeability of the leach solution in the ore heap. Heap leaching raw ore requires crushing pretreatment to increase the exposure rate of gold particles. However, the current mechanical crushing method will produce a large amount of fine-grained ore. Excessive fine-grained ore will reduce the voids inside the ore heap, resulting in channeling or ev...

AI Technical Summary

Problems solved by technology

Heap leaching raw ore requires crushing pretreatment to increase the exposure rate of gold particles. However, the current mechanical crushing method will produce a large amount of fine-grained ore. Excessive fine-grained ore will reduce the voids inside the ore heap, resulting in channeling or even blockage. Seriously reduces the permeability of the leach solution in the ore heap

Therefore, mechanical crushing cannot meet the requirements of heap leaching technology on the exposure rate of gold particles and the permeability of the solution.

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