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Method for resource recovery of iron sulfide tailings

A technology for recycling iron tailings, which is applied in the field of tailings recycling, can solve problems such as environmental pollution, low utilization rate, and high energy consumption, and achieve the effects of improving metal recovery rate, leaching recovery rate, and high leaching rate

Active Publication Date: 2017-12-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional metallurgical technology is mainly suitable for high-grade mineral resources, and has low utilization rate, high energy consumption, and serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for recycling iron sulfide tailings, comprising the steps of:

[0025] 1) Put the iron sulfide-containing tailings into the MFC anode chamber, inoculate the acclimated electrogenic microorganism liquid, and add the culture solution to adjust its pH, and the anode chamber is in an anaerobic state; the MFC cathode chamber is installed with an aeration device so that Oxygen was passed during operation, and 50 mM phosphate buffer was added to the cathode chamber at the same time to construct a dual-chamber MFC device. Among them, a proton exchange membrane is used between the anode chamber and the cathode chamber of the MFC. Both the anode electrode and the cathode electrode use graphite felt electrodes.

[0026] 2) When the device is started, a half reaction occurs at the anode: FeS 2 +8H 2 O → Fe 3+ +16H + +2SO 4 2– +15e – , a half-reaction occurs at the cathode: 3.75O 2 +15H + +15e – →7.5H 2 O.

[0027] During the reaction, along with the oxidation ...

Embodiment 2

[0034] A method for recycling iron sulfide-containing tailings, the difference from Example 1 is that the concentration of iron sulfide-containing tailings in the anode chamber is 12.5g / L, after the operation of the MFC device, compared with traditional microbial leaching, The leaching recovery of iron ions was increased by 13.26%, and the highest voltage generated was 137.9mV.

Embodiment 3

[0036] A method for recycling iron sulfide-containing tailings, the difference from Example 1 is that the concentration of iron sulfide-containing tailings in the anode chamber is 25g / L, after the operation of the MFC device, compared with traditional microbial leaching, iron The leaching recovery of ions was increased by 17.98%, and the highest voltage generated was 287.6mV.

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Abstract

The invention relates to a method for recycling ferric sulphide-containing tailings. According to the method, oxidizing half-reaction FeS2+8H2O -> Fe<3+>+16H<+>+2SO4<2->+15e<-> and reducing half-reaction 3.75O2+15H<+>+15e<-> -> 7.5H2O (3) are respectively put into an anode chamber and a cathode chamber of a microbial fuel cell (MFC) for microbial leaching, so as to obtain ferric sulphide-containing tailings; and when metal is recovered, electrons released by oxidizing half-reaction can also be recovered by an outer circuit of the MFC in a form of electric energy, so that the operation cost is reduced. In addition, protons generated by oxidizing half-reaction are transmitted to a cathode to participate into reduction reaction to generate water, and are continuously consumed, so that the leaching rate can be significantly improved to improve the metal recovery rate; meanwhile, the generated water is environment-friendly and free of secondary pollution; and corrosion to equipment caused by acid production can also be retarded.

Description

technical field [0001] The invention relates to a method for recycling waste materials, in particular to a method for recycling tailings. Background technique [0002] With the massive mining of mineral resources, the high-grade and easy-to-select mineral resources are decreasing day by day, and people have to start to consider the development and utilization of low-grade mineral resources and the recycling of valuable metals in tailings. Traditional metallurgical technology is mainly suitable for high-grade mineral resources, and has low utilization rate, high energy consumption and serious environmental pollution. The rapid development of microbial metallurgy technology in recent years has shown broad application prospects in the field of mineral processing due to its characteristics of low production cost, low investment, simple process, high recovery rate and environmental friendliness. [0003] According to the action principle of microorganisms in the metallurgical pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/16
CPCH01M8/16Y02E60/50Y02P70/50
Inventor 李秀芬聂鹏飞任月萍王新华
Owner JIANGNAN UNIV
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