Method for inhibiting oxidation of pyrite in biological metallurgy process

A biometallurgy and pyrite technology is applied in the field of inhibiting pyrite oxidation, which can solve the problems of increased copper production cost, large consumption of extractant, and high environmental protection pressure, so as to reduce living space, inhibit excessive oxidation, and enhance the use effect. Effect

Active Publication Date: 2018-05-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The excess of acid iron will bring adverse effects to the subsequent extraction and electrowinning process. There are many three-phases in the extraction process, and the consumption of extraction agent is large; moreover, the production process needs to neutralize acid iron, which will cause great pressure on environmental protection and increase the cost of copper production.

Method used

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  • Method for inhibiting oxidation of pyrite in biological metallurgy process
  • Method for inhibiting oxidation of pyrite in biological metallurgy process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the low-grade copper ore bioheap leaching test, the ore composition was Cu 0.35%, Fe 5.19%, and reduced S6.18%. The main copper minerals in the ore are chalcocite, copper blue and sulphur arsenic, among which chalcocite accounts for more than 90%, and the content of pyrite is 9.2%. The main gangue minerals are feldspar, quartz and sericite. The ore is crushed to a particle size of less than 50mm, and the inhibitor powder is evenly mixed into the inhibitor powder. The inhibitor is composed of: polyacrylamide, with a dosage of 200mg / kg ore; sodium benzoate, with a dosage of 500mg / kg ore; sodium metabisulfite, with a dosage 200mg / kg ore; acetic acid, the use dose is 1000mg / kg ore. After 150 days of leaching, the copper leaching rate was 86.6%, and the pyrite oxidation rate was 2.0%.

Embodiment 2

[0040] The only difference from Example 1 is that the inhibitor does not contain acetic acid. After 150 days of leaching, the copper leaching rate was 85.0%, and the pyrite oxidation rate was 3.4%.

Embodiment 3

[0042] The only difference from Example 1 is that the inhibitor does not contain sodium metabisulfite. After 150 days of leaching, the copper leaching rate was 85.5% and the pyrite oxidation rate was 3.4%.

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Abstract

The invention relates to a method for inhibiting pyrite oxidation in a biological metallurgy process. According to the method, an inhibitor is added into ores in the biological leaching process, so that the activity of a ferrous oxidation microorganism is inhibited, and therefore excessive oxidation of the pyrite in the ore biological leaching process is inhibited; and the inhibitor comprises an anionic surfactant and an auxiliary agent, wherein the auxiliary agent comprises one or the combination of at least two of the following agents of an enzyme activity inhibitor, a deoxidizing agent anda heterotrophic microbial accelerator; the method has the advantages that excessive dissolution of the pyrite is inhibited, and excessive accumulation of acid iron is controlled from the source; and the leaching rate and the final leaching rate of target metal can be improved, and cost is reduced.

Description

Technical field [0001] The invention relates to the field of biometallurgy, in particular to a method for inhibiting the oxidation of pyrite in a biometallurgical process. Background technique [0002] In the biological heap leaching process of some low-grade ore, the pyrite content in the ore is high, the sulfur copper is relatively high, the acid consumption is less, and the dissolution of a large amount of pyrite will cause the system to excess acid iron. Excessive iron acid has an adverse effect on the subsequent extraction electrowinning process. There are three phases in the extraction process, and the extractant consumption is large; and the production process needs to neutralize acid iron, which puts great pressure on environmental protection and increases the cost of copper production. [0003] The dissolution characteristics of sulfide minerals depend on the characteristics of the valence band. The valence band of pyrite is composed of metal atomic orbitals. The loss of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18
CPCC22B3/18Y02P10/20
Inventor 阮仁满贾炎谭巧义孙和云
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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