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Technique for processing low concentration heavy metal sulfate liquor with microorganism method

A technology of low-concentration heavy metals and microbial methods, which is applied in the field of wastewater treatment and low-concentration valuable metals, and can solve the problems that do not involve the separation and recovery of heavy metals and the concentration of heavy metal ions is not too high

Active Publication Date: 2008-06-11
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

There are many patents on the treatment of wastewater by sulfate biological reduction, but the target of treatment is basically mine wastewater with a low concentration of heavy metal ions. The main target of treatment is only to remove heavy metal ions in wastewater, and does not involve the separation and recovery of heavy metals. Problems (KR2001055997, ZA9904586, US6203700), there is no patented technology directly applied to the treatment of low-grade complex mineral bioleachate at home and abroad

Method used

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  • Technique for processing low concentration heavy metal sulfate liquor with microorganism method
  • Technique for processing low concentration heavy metal sulfate liquor with microorganism method
  • Technique for processing low concentration heavy metal sulfate liquor with microorganism method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The concentrations of metal ions in the biometallurgical leaching solution (pentlandite leaching solution) to be treated are respectively:

[0025] Fe 3+ : 5g / L, Ni 2+ : 2g / L, Cu 2+ : 0.5g / L, Mg 2+ : 20g / L

[0026] When the two units of acidogenic fermentation and sulfate-reducing bacteria-producing hydrogen sulfide are successfully started and run stably, and the total sulfide production is continuously stable above about 300mg / L, the outlet liquid in the reactor is poured into the precipitation reactor . The sulfate-reducing bacteria-producing hydrogen sulfide reactor is filled with ceramic rings as immobilized carriers. Cu 2+ The sulfide precipitate is formed first, and it is almost completely precipitated when the pH value is 1-3. The Cu finally detected in the treated leachate 2+ The content is less than 5mg; adjust the pH value, Fe 3+ and Ni 2+ When the pH value is 2-8, it gradually transforms into sulfide precipitation, and the final detected Fe in the s...

Embodiment 2

[0028] The concentrations of metal ions in the biometallurgical leaching solution (pentlandite leaching solution) to be treated are respectively:

[0029] Fe 3+ : 5g / L, Ni 2+ : 2g / L, Cu 2+ : 0.5g / L, Mg 2+ : 20g / L

[0030] After the two units of acidogenic fermentation and sulfate-reducing bacteria producing hydrogen sulfide are successfully started and run stably, and the total sulfide production is continuously stable above about 300 mg / L, the outlet liquid in the reactor is poured into the precipitation reactor . The sulfate-reducing bacteria-producing hydrogen sulfide reactor is filled with sponge as an immobilized carrier. Cu 2+ The sulfide precipitate is formed first, and it is almost completely precipitated when the pH value is 1-3. The Cu finally detected in the treated leachate 2+ The content is less than 2mg; adjust the pH value, Fe 3+ and Ni 2+ When the pH value is 2-8, it gradually transforms into sulfide precipitation, and the final detected Fe in the solu...

Embodiment 3

[0032] The concentrations of metal ions in the biometallurgical leaching solution (copper sulfide ore leaching tailing liquid) to be treated are respectively:

[0033] Fe 3+ : 5g / L, Cu 2+ : 10g / L

[0034] The specific implementation method is the same as embodiment 1, Cu 2+ First, sulfide precipitates are formed, which are almost completely precipitated when the pH value is 1-3, and the Cu finally detected in the treated leachate 2+ The content is less than 50mg; adjust the pH value, Fe 3+ When the pH value is 2-9, it gradually transforms into sulfide precipitation, and the final detected Fe in the leachate after precipitation 3+ The content is less than 12mg, and the recovery rate of valuable metals is high, copper is 99%, and iron is 95%.

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Abstract

The invention relates to a process that sulfureted hydrogen is generated by performing the sulfate reduction to low concentration heavy metal sulphate solution in biological metallurgy through microorganism sulfatereducing bacteria, the selective precipitation of the valuable metallic sulfide is realized through the method of adjusting pH value, the traditional process of separating, concentrating and reutilizing is adopted to extract metal. The process is composed of three separate units: anaerobic acidogenic fermentation, sulfureted hydrogen generated through sulfatereducing bacteria and selective precipitation of the metallic sulfide. The process not only can exert the advantages that the process of the bacteria leaching is simple, the operation is easy, the cost is low and the pollution is low, but also has high recovery ratio of valuable metal, and the post treatment process can be economically and effectively built, in addition, the process also provides novel methods for recycling other low concentration waste water including sulphate.

Description

technical field [0001] The invention relates to a process for treating low-concentration heavy metal sulfate solution using a microbial method of sulfate-reducing bacteria (SRB, sulfate reducing bacteria), which is particularly suitable for effectively recovering low-concentration valuable metals in biometallurgical leaching solutions, and can also be applied to acidic Mine wastewater, electroplating wastewater, tanning and other wastewater treatment processes in the chemical and environmental fields. Background technique [0002] In recent years, great progress has been made in the basic and applied research of biometallurgy at home and abroad. The current biometallurgy research is mainly on how to realize the bacterial leaching of valuable metal minerals and how to increase the mineral leaching rate, but less attention has been paid to how to deal with the leaching solution containing low concentration of valuable metals obtained by leaching. For the bacterial leachate of...

Claims

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Application Information

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IPC IPC(8): C22B3/18C02F3/28C02F1/62
CPCY02P10/20
Inventor 张广积曹俊雅杨超禹耕之韩宝玲毛在砂方兆珩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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