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Acid Separation and Concentration Method in Sewage Acid

An acid concentration and fouling acid technology, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. The effect of facilitating the recycling environment, improving the recycling rate, and efficient recycling

Active Publication Date: 2015-09-09
CHANGSHA SCI ENVIRONMENTAL TECH +1
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  • Abstract
  • Description
  • Claims
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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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  • Acid Separation and Concentration Method in Sewage Acid
  • Acid Separation and Concentration Method in Sewage 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 dirty acid solution rose to 3.2, the zinc ion concentration in the dirty acid solution was 137.5mg / L, the lead ion concentration was 33.75mg / L, and the arsenic concentration was 112.5mg / L; the mass fraction of the acid concentration in the separated concentrated solution was 8.3 %, zinc ion concentration is 0.38mg / L, lead ion concentration is 0.15mg / L, arsenic concentration is 0.45mg / L. The low-acid heavy metal liquid after acid separation passes through the sulfidation reactor. The recovery rate of zinc is 97.5%, and the recovery rate of lead is 95.4%.

[0055] The electricity consumption per cubic meter of dirty acid is about 10 degrees, the vulcanization process consumes 0.8kg of sulfide, and the treatment ...

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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 environmental protection field of metallurgy and chemical industry, and relates to a method for separating and concentrating acid in dirty acid, that is, using electrodialysis technology and adopting a reasonable ion selective membrane to realize the separation of acid and heavy metal ions in dirty acid, and the concentrated acid can be Recycling is achieved, and low acidity wastewater containing heavy metals is convenient for subsequent recycling and treatment. Background technique [0002] The smelting flue gas of domestic sulphuric acid production mainly comes from the smelting process of copper, nickel, lead, zinc, gold and other metals. The smelting flue gas uses a wet purification process in the process of producing sulfuric acid. In the empty tower and filler of wet dust removal A large amount of acidic wastewater is generated during the tower, power wave, and electric mist removal process, that is, dirty acid. Waste aci...

Claims

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Application Information

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Patent Type & Authority Patents(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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