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

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1:

[0024] The concentrations of metal ions in the biometallurgical leaching solution to be processed (nickel pyrite leaching solution) are:

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

[0026] When the two units of acid-producing fermentation and hydrogen sulfide production by sulfate-reducing bacteria are successfully started and operating stably, and the total sulfide output continues to stabilize above about 300 mg / L, the outlet liquid in the reactor is pumped into the precipitation reactor . Among them, the hydrogen sulfide production reactor of sulfate-reducing bacteria is filled with a porcelain ring as an immobilization carrier. Cu 2+ The sulfide precipitate is formed first, and almost completely precipitates when the pH value is 1 to 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 will gradually transform into sulfide precipitation, and ...

Example Embodiment

[0027] Example 2:

[0028] The concentrations of metal ions in the biometallurgical leaching solution to be processed (nickel pyrite leaching solution) are:

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

[0030] When the two units of acid-producing fermentation and hydrogen sulfide production by sulfate-reducing bacteria are successfully started and operating stably, and the total sulfide output continues to stabilize above about 300 mg / L, the outlet liquid in the reactor is injected into the precipitation reactor . The hydrogen sulfide production reactor of sulfate-reducing bacteria is filled with sponge as an immobilized carrier. Cu 2+ The sulfide precipitate is formed first, and almost completely precipitates when the pH value is 1 to 3. The Cu finally detected in the treated leachate 2+ Content is less than 2mg; adjust pH value, Fe 3+ And Ni 2+ When the pH value is 2~8, it will gradually transform into sulfide precipitation, and the final Fe detected in the solu...

Example Embodiment

[0031] Example 3:

[0032] The concentrations of metal ions in the biometallurgical leaching solution (copper sulfide ore leaching tailings) to be processed are:

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

[0034] The specific implementation method is the same as in Example 1, Cu 2+ First, sulfide precipitates are formed, and they are almost completely precipitated when the pH is 1 to 3. The Cu finally detected in the leaching solution after treatment 2+ The content is less than 50mg; adjust the pH value, Fe 3+ When the pH value is 2~9, it will gradually transform into sulfide precipitation, and the final Fe detected in the leachate after precipitation 3+ The content is less than 12mg, and the valuable metals have a higher recovery rate, 99% for copper and 95% for iron.

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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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