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: 2010-08-18
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] This new process is applied to a domestic low-grade secondary copper sulfide ore. The copper metal minerals in the ore are mainly copper blue and chalcocite. Other major minerals are alunite (5.0-6.0%) and pyrite (4.0-4.5%). ), followed by limonite (0.2-0.3%), and gangue minerals are mainly quartz.

[0029] In 90ml Leathen medium, inoculate 10ml of the acidic mine water sample from the mine, cultivate in a constant temperature water bath on a shaker, and control the temperature at 30°C. The rotation speed of the shaker is controlled to 160 rpm, and the redox potential, pH value and cell density in the liquid phase are measured regularly. Add 3.0 mol / L H dropwise to Thiobacillus ferrooxidans in the late logarithmic growth stage 2 SO 4 , Keep the pH of the culture medium around 1.5, and the nutrients added 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 mineral powder with a particle size of less...

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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 biological leaching process for secondary copper sulfide ore with high sulfur / copper (S / Cu) ratio and low grade, especially in the case of high sulfur and iron content, maintaining copper ore in a biological leaching system With high leaching rate, it effectively inhibits the leaching of sulfur and iron and reduces 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 with a shortage of copper resources, and the self-sufficiency rate of raw materials for refined copper is only 40%. Biometallurgy is an efficient and low-consumption new industrialization technology for the development and utilization of non-ferrous metal resources that has developed rapidly in the past two decades. It is a ...

Claims

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Application Information

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Patent Type & Authority Applications(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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