Stage-by-stage dump leaching technology for low-grade mixed copper ore

A mixed copper ore, low-grade technology, applied in the direction of improving process efficiency, can solve the problems of poor flotation effect of copper oxide minerals, high operating costs, low copper recovery rate, etc., and is conducive to effective recovery and heap leaching. Short cycle time and the effect of improving leaching rate

Active Publication Date: 2012-08-22
CHINA NERIN ENG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This type of method has complicated process, large investment, large transportation volume, high operating cost, waste gas generated by pyrometallurgy an

Method used

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  • Stage-by-stage dump leaching technology for low-grade mixed copper ore
  • Stage-by-stage dump leaching technology for low-grade mixed copper ore

Examples

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Embodiment 1

[0036] In a copper mine, the above-mentioned steps are used for step-by-step heap leaching. The copper metal in the copper oxide minerals with a fast leaching speed is recovered in the heap leaching stage of the reusable stockyard, and the copper metal in the copper sulfide minerals with a slow leaching speed is recovered. Copper metal is recycled in permanent storage yards, and the copper leaching rate is 10-15% higher than that of conventional heap leaching methods.

[0037] The copper mine is a porphyry-type copper deposit, which is a low-grade mixed copper ore, and its content ratio of copper oxide ore and copper sulfide ore is about 3:1. Copper oxide ores are mainly malachite, azurite and chrysocolla; copper sulfide ores are mainly chalcocite and bornite; gangue minerals are mainly feldspar, quartz and biotite.

[0038] The low-grade mixed copper ore contains 0.42% copper, and the daily raw ore processing scale of the mine is 7000t. The processing technology of this mixe...

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Abstract

The invention discloses a stage-by-stage dump leaching technology for low-grade mixed copper ore, which is used for treating the low-grade mixed copper ore of oxidized ore and sulphide ore. The technology comprises the following steps of: (1) crushing raw ore: carrying out three-section closed-circuit crushing on the raw ore; (2) curing with sulfuric acid; (3) carrying out first-stage dump leaching: carrying out dump leaching by a repeated stock dump; (4) carrying out second-stage dump leaching: carrying out dump leaching by a permanent stock dump; and (5) recovering copper metal: extracting,back extracting and electrically depositing. By using the stage-by-stage dump leaching technology for the low-grade mixed copper ore, the copper metal in the copper oxide mineral can be recovered at a quick leaching speed according to the leaching period difference between the copper oxide ore and the copper sulphide ore and in accordance with the principle 'the earlier the better', and simultaneously the sufficient recovery of the copper metal in the copper sulphide metal can also be considered. According to the stage-by-stage two-step dump leaching, the leaching efficiency of the copper metal in the low-grade mixed copper ore can be improved, the low-grade copper ore can be effectively recovered, and the resource utilization rate can be enlarged.

Description

technical field [0001] The invention belongs to a hydrometallurgical heap leaching process, and relates to a method for extracting metallic copper from low-grade mixed copper ores by heap leaching in stages, in particular to a method for extracting metallic copper from low-grade mixed copper ores. Background technique [0002] At present, the method of extracting copper from mixed copper ore containing copper sulfide minerals and copper oxide minerals is mainly: flotation process + pyrometallurgy process, that is, after the mixed copper ore is crushed, the sulfide ore is first selected and then oxidized. The flotation process of ore is used to obtain copper sulfide concentrate and copper oxide concentrate, and then the copper concentrate is purified by pyrometallurgy and electrolysis to obtain electrolytic copper. This type of method has complex process, large investment, large transportation volume, high operating cost, waste gas generated by pyrometallurgy and acid product...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B3/18C22B3/26
CPCY02P10/20
Inventor 王福元袁国才
Owner CHINA NERIN ENG
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