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Selective bioleaching process of high-sulphur/copper ratio secondary copper sulphide ore

A copper sulfide ore and biological leaching technology, applied in the direction of improving process efficiency, can solve problems affecting extraction, electrowinning efficiency, high S/Cu ratio of ore, low alkaline gangue content, etc., and achieve short process flow, The effect of high recovery rate and simple equipment

Active Publication Date: 2012-04-25
有研资源环境技术研究院(北京)有限公司
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Problems solved by technology

However, some copper mines in my country have relatively low copper grade, low alkaline gangue content, high ore S / Cu ratio, continuous accumulation of iron in the process of leachate circulation, and excess acid iron in the late stage of bioleaching, which affects extraction and electrowinning efficiency, resulting in subsequent treatment. cost increase

Method used

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  • Selective bioleaching process of high-sulphur/copper ratio secondary copper sulphide ore
  • Selective bioleaching process of high-sulphur/copper ratio secondary copper sulphide ore

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Embodiment 1

[0028] The new process is applied to a low-grade secondary copper sulfide ore in China. The copper metal minerals in the ore are mainly copper blue and chalcocite, and other main minerals are alunite (5.0-6.0%), pyrite (4.0-4.5%) ), followed by limonite (0.2-0.3%), and the gangue minerals are mainly quartz.

[0029] In 90ml of Leather medium, inoculate 10ml of the acidic pit water sample collected from the mine, and cultivate in a constant temperature water bath in a shaker, with the temperature controlled at 30°C. The rotation speed of the shaker was controlled at 160 rpm, and the oxidation-reduction potential, pH value and cell density in the liquid phase were regularly measured. Add 3.0mol / L H 2 SO 4 , keep the pH of the culture solution around 1.5, and the added nutrients are: (NH 4 ) 2 SO4 0.3g, KH 2 PO 4 3~4g, CaCl 2 (anhydrous) [anhydrous] 0.25g, MgSO 4 ·7H 2 O0.5g, FeSO 4 ·7H 2 O 0.001g; then add ore powder with particle size less than 0.074mm, the slurry c...

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Abstract

The invention relates to a selective bioleaching process of a high-sulphur / copper ratio secondary copper sulphide ore. In the process, microorganisms are utilized to leach the high-S / Cu ratio low-grade secondary copper sulphide ore, and the oxidation-reduction potential in the leaching process is controlled through the measures of regulating the pH, the dripping intensity, the fallow system, the air permeability, the breeding of dominant species, and the like so as to realize the selective leaching of the secondary copper sulphide ore. The process has short flow, simple equipment, low investment, low cost, no pollution, high recovery rate and adjustable production scale, can treat low-grade copper ore resources which cannot be treated by using the traditional selecting and smelting process, the resource utilization range is enlarged, and the comprehensive recovery level of copper metal is improved.

Description

technical field [0001] The invention relates to a selective bioleaching process for low-grade secondary copper sulfide ores with high sulfur / copper (S / Cu) ratio, especially in the case of high sulfur content and high iron, in the bioleaching system, the copper ore can be kept At the same time, it can effectively inhibit the leaching of sulfur and iron, and reduce the cost of subsequent iron removal. Background technique [0002] In recent years, with the rapid economic development, my country has become the world's largest copper consumer, copper processing and manufacturing base, and copper basic product exporter. However, my country is a country short of copper resources, and the self-sufficiency rate of raw materials for refined copper is only 40%. Biometallurgy technology is a new high-efficiency and low-consumption industrial technology for the development and utilization of non-ferrous metal resources that has developed rapidly in the past two decades. It is a short-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 武彪温建康阮仁满刘学刘美华周桂英
Owner 有研资源环境技术研究院(北京)有限公司
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