Method for separating and concentrating acid in contaminated acid

A technology of acid concentration and dirty acid, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low acid recovery rate, difficult separation of acid and heavy metal ions, difficult recycling, etc., and achieve high efficiency Recycling, the simple convenience of the recycling environment, and the effect of improving the recycling rate

Active Publication Date: 2014-02-05
CHANGSHA SCI ENVIRONMENTAL TECH +1
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Problems solved by technology

[0028] Moreover, at present, some enterprises in the sewage acid treatment industry have adopted the method of diffusion dialysis to separate the acid in the sewage acid. However, since the diffusion dialysis relies on the concentration gradient of the solution to separate the acid, the recovery rate of the acid is low, and the recovered acid Low concentration is difficult to achieve recycling, and it is difficult to separate acid and heavy metal ions while recovering acid

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  • Method for separating and concentrating acid in contaminated acid
  • Method for separating and concentrating acid in contaminated acid

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Embodiment 1

[0054] Example 1: Sewage acid from a lead-zinc smelter, acid mass fraction (calculated as sulfuric acid) 4.2%, zinc ion concentration 138mg / L, lead ion 34mg / L, arsenic concentration 113.3mg / L, separated by electrodialysis device for 20 minutes , the pH value of the original sewage acid solution rose to 3.2, the zinc ion concentration in the sewage acid solution was 137.5mg / L, the lead ion concentration was 33.75mg / L, and the arsenic concentration was 112.5mg / L; the acid concentration mass fraction in the separated concentrated solution was 8.3 %, the zinc ion concentration is 0.38mg / L, the lead ion concentration is 0.15mg / L, and the arsenic concentration is 0.45mg / L. The low-acid heavy metal liquid after acid separation passes through the vulcanization reactor, the recovery rate of zinc is 97.5%, and the recovery rate of lead is 95.4%.

[0055] The power consumption for treating each cubic meter of dirty acid is about 10 degrees, the vulcanization process consumes 0.8kg of sul...

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Abstract

The invention discloses a method for separating and concentrating acid in contaminated acid. According to the invention, acid in contaminated acid can be separated and further concentrated by selecting proper anionic and cationic ionic membranes and utilizing the electrodialysis integration technology; the separated and concentrated acid is above 8% in concentration and can be recycled; the acidity of the contaminated acid solution in which acid is separated is reduced till the pH is above 3.0; heavy metal ion cannot pass through a selective membrane and is reserved in the contaminated acid solution in which acid is separated; further subsequent treatment is conveniently carried out.

Description

technical field [0001] The invention belongs to the field of metallurgy, chemical industry and environmental protection, and relates to a method for separating and concentrating acid in polluted acid, that is, by using electrodialysis technology and adopting a reasonable ion-selective membrane, the separation of acid and heavy metal ions in polluted acid can be realized, and the concentrated acid can be Recycling is achieved, and the low-acidity heavy metal-containing wastewater is convenient for subsequent recycling and treatment. Background technique [0002] Domestic acid smelting flue gas mainly comes from the smelting process of copper, nickel, lead, zinc, gold and other metals. The smelting flue gas uses wet purification process in the process of sulfuric acid production. A large amount of acidic wastewater, namely dirty acid, will be produced in the process of tower, power wave and electrostatic demisting. Sewage acid wastewater is strongly acidic, the concentration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44
Inventor 王庆伟柴立元蒋国民李青竹杨志辉高伟荣
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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