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Bio-electrochemical system used for copper sulfide ore leaching

A bioelectrochemical, copper sulfide technology, applied in the field of bioelectrochemical systems, can solve the problems of serious pollution, high cost, slow reaction speed, etc.

Inactive Publication Date: 2013-06-05
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional metallurgical techniques for extracting copper from low-grade copper ores are costly and polluting
Bioleaching technology is currently a commonly used method for leaching copper from low-grade copper ores because of its low cost, simple process, and no secondary pollution. However, it also has some limitations, such as slow reaction speed and low bacterial activity.

Method used

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  • Bio-electrochemical system used for copper sulfide ore leaching

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Embodiment approach 1

[0017] Implementation Mode 1: Device Installation

[0018] according to figure 1 The principle diagram shown in the installation device: the cation exchange membrane (2) divides the device into an anode chamber (A) and a cathode chamber (B). The transmittance of the cation exchange membrane (2) used is 96%, and the membrane thickness is 0.3mm. Bursting strength ≥ 0.5MPa. The volume of the anode chamber (A) and the cathode chamber (B) are both 25cm 3 . A carbon felt with a thickness of 0.5 cm was placed as an electrode in both the anode chamber (A) and the cathode chamber (B), with an area of ​​2.5×2.5 cm. The anode (1) and the cathode (3) are connected by titanium wire, wire and external resistance (5) of 500Ω.

Embodiment approach 2

[0019] Implementation Mode 2: Device Operation

[0020] After the installation of the device is completed, the enriched and cultured bacterial solution is centrifuged and the supernatant is discarded, the bacterial sediment is mixed with the newly prepared bacterial culture solution, and then added to the anode chamber (A), and finally copper sulfide is added; the solution of the cathode chamber (B) is 50mM potassium ferricyanide and 50mM K 2 HPO 4 . In the anode compartment (A), Fe 2+ exist Acidithiobacillus ferrooxidans (4) is oxidized to Fe under the action of 3+ , copper sulfide and Fe 3+ A chemical reaction occurs to obtain Cu 2+ , Fe 2+ and elemental S. The sealed anode chamber (A) maintains an anaerobic environment, and the elemental S cannot be further oxidized, so that the elemental sulfur can be recovered, and the generation of harmful sulfur oxidation products (such as sulfate) can also be avoided. Fe 2+ Oxidized to Fe 3+ The generated electrons are tran...

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Abstract

The invention belongs to the bioleaching field and relates to a bio-electrochemical system used for copper sulfide ore leaching. The system utilizes the electron transfer capability of microbes to improve the copper sulfide leaching efficiency, recover elemental sulfur and generate electricity. The system is composed of an anode chamber, a cathode chamber, a cation exchange membrane and an external circuit. Fe<2+> in the anode chamber is oxidized to Fe<3+> under the action of ore leaching bacteria Acidithiobacillus ferrooxidans, copper sulfide reacts with the oxidation product Fe<3+> to obtain Cu<2+> and elemental sulfur, and Fe<3+> is reduced to Fe<2+> which is reused by the ore leaching bacteria. The transfer of electrons to a cathode from an anode promotes the oxidation of Fe<2+> to Fe<3+> and indirectly promotes the leaching of Cu<2+>. The bio-electrochemical system used in the invention has the advantages of simple technology, easy operation, and low operation cost, and has practical application values.

Description

technical field [0001] The invention relates to a bioelectrochemical system for leaching copper sulfide ore. The system uses the electron transfer ability of microorganisms to improve the leaching efficiency, and can recover elemental sulfur and generate electricity. Background technique [0002] Copper deposits are abundant in nature. However, my country's copper resources have the obvious characteristics of large mines, few rich mines, and many small mines and lean mines. Therefore, it is of great significance to extract copper from low-grade copper mines. Conventional metallurgical techniques for extracting copper from low-grade copper ores are costly and polluting. Bioleaching technology is currently a common method for leaching copper from low-grade copper ores because of its low cost, simple process, and no secondary pollution. However, it also has some limitations, such as slow reaction speed and low bacterial activity. The key to increasing the leaching rate is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00C01B17/06
CPCY02P10/20
Inventor 赵峰梁方圆肖勇
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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