An electrochemical method and device for controlling bioleaching process

A bioleaching and electrochemical technology, applied in the direction of improving process efficiency, can solve problems such as excess acid and iron, low recovery rate of copper resources, and increased pressure on environmental protection, so as to reduce the production of acid iron and achieve selective leaching , reduce the effect of solution purification

Active Publication Date: 2019-09-03
有研资源环境技术研究院(北京)有限公司
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  • Application Information

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Problems solved by technology

Taking copper ore as an example, most of the proven copper grades are lower than 0.5%, and the content of pyrite is relatively high, which cannot be economically recovered by traditional dressing and smelting technology
[0003] In recent years, the biometallurgical technology developed can solve the technical problem of low recovery rate of copper resources, but in the middle and later stages of leaching, there is excess acid and iron, the cost of subsequent solution purification and copper ion extraction increases, and the pressure on environmental protection increases
In addition, during the long-term stockpiling of the waste rock stripped by mining, a large amount of acidic wastewater is produced under the action of bacteria, water and oxygen, which is a huge hidden danger for mine environmental protection

Method used

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  • An electrochemical method and device for controlling bioleaching process
  • An electrochemical method and device for controlling bioleaching process
  • An electrochemical method and device for controlling bioleaching process

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Experimental program
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Embodiment 1

[0045] The ore used comes from a low-grade copper sulfide mine in Fujian. The copper in the ore mainly exists in the form of chalcocite and copper blue, the content of pyrite is relatively high, and the gangue minerals mainly exist in the form of silicate, and the acid consumption is low. The analysis results of the main elements of the ore are shown in Table 1.

[0046] Table 1 Chemical analysis results of main elements

[0047] Cu Fe S SiO 2

Content / wt% 0.35 3.52 3.81 79.28

[0048] First add tap water to the electrochemical cell, use 20v / v% sulfuric acid to prepare acidic water with a pH value of 1.50 as the electrochemical reaction solution, add it to the anode area and the cathode reaction area, and then insert the cultured mixed bacteria into the cathode area, the inoculation amount 20% (v / v), then add -74 micron ore powder with a proportion of more than 80%, prepare the pulp concentration to 5% (w / w), and ventilate the air, the ventila...

Embodiment 2

[0053] The ore used comes from a low-grade copper sulfide mine in Xinjiang. The copper in the ore mainly exists in the form of chalcocite and chalcopyrite, the content of pyrite is relatively high, the gangue minerals mainly exist in the form of silicate, and the acid consumption is low. . The analysis results of the main elements of the ore are shown in Table 3.

[0054] Table 3 Chemical analysis results of main elements

[0055] Cu Fe S SiO 2

Content / wt% 0.45 3.61 3.71 80.12

[0056] First add tap water to the electrochemical cell, use 20v / v% sulfuric acid to prepare acidic water with a pH value of 1.50 as the electrochemical reaction solution, add it to the anode area and the cathode reaction area, and then insert the cultured mixed bacteria into the cathode area, the inoculation amount 20% (v / v), then add -74 micron ore powder with a proportion of more than 80%, prepare a pulp concentration of 5% (w / w), and ventilate, the ventilation rat...

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Abstract

The invention provides an electrochemical method and equipment which can control a bioleaching process. In the bioleaching process, oxidation-reduction potential of a leaching system is controlled electrochemically, pH value is maintained to be basically constant, and rapid oxidation of pyrite can be effectively controlled without influencing dissolution of a copper sulfide ore. The electrochemical method provided by the invention has the advantages that the oxidation-reduction potential in the leaching system can be accurately controlled and conditions are created for realizing selective leaching of the copper sulfide ore.

Description

technical field [0001] The invention belongs to the field of biometallurgy and relates to an electrochemical method for controlling the bioleaching process. This method is applied to the biological leaching process of low-grade copper sulfide ore with high pyrite content and the source treatment of acidic wastewater in mines. Background technique [0002] With the continuous mining of mineral resources, the grade of valuable metals is decreasing and the difficulty of recycling is increasing. Taking copper ore as an example, most of the proven copper grades are lower than 0.5%, and the content of pyrite is relatively high, which cannot be economically recovered by traditional dressing and smelting techniques. [0003] In recent years, the biometallurgical technology developed can solve the technical problem of low recovery rate of copper resources, but in the middle and later stages of leaching, there is excess acid and iron, the cost of subsequent solution purification and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B3/02C22B15/00
CPCC22B3/02C22B3/18C22B15/0071Y02P10/20
Inventor 武彪尚鹤陈勃伟温建康
Owner 有研资源环境技术研究院(北京)有限公司
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