Process of recovering and utilizing pollutant waste acid liquid

A low-concentration, acid recovery technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of iron powder consumption, invention method limitations, and large waste of manpower, so as to save waste water The effect of processing fees

Active Publication Date: 2007-11-07
JIANGSU YUANZHENG CHEM
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  • Abstract
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AI Technical Summary

Problems solved by technology

1. Adopt the method of cleaning and diverting, and use lime to neutralize and adsorb the mother liquor, but it will produce a large amount of secondary pollution solid waste
2. The iron-carbon degradation and biological treatment method of mixing mother liquor and lotion is used. The disadvantage is that it consumes a lot of iron powder and high-cost chemical reagents
3. Using other methods: such as ozone method, electrolysis method and strong oxidant method, there are also problems such as large energy consumption, high cost, and large waste of manpower.
[0004] But this inventive method still has very big limitation, and the utilization of follow-up product also urgently needs further development

Method used

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  • Process of recovering and utilizing pollutant waste acid liquid
  • Process of recovering and utilizing pollutant waste acid liquid
  • Process of recovering and utilizing pollutant waste acid liquid

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Embodiment Construction

[0023] See Figure 1. After mixing all kinds of wastewater mother liquors evenly, measure the acidity. It is required to have a sulfuric acid acidity greater than 5%. The higher the better, otherwise it will lead to difficulties in recovery. 3 In a large tank, batch homogenization is carried out, and then the mixed mother liquor water is pumped into the concentration system for concentration. It is also best to carry out decolorization and filtration before concentration, so as to remove some impurities and avoid blockage of pipelines and evaporators in the concentration system. Concentrate until the acidity is about 30-75%. At this time, a large amount of impurities will be precipitated, and the precipitated impurities will be removed by filtration after cooling down slightly.

[0024] Put the concentrated and impurity-removed wastewater into the distillation pot, add the prepared sodium chloride, the molar ratio of sodium chloride to sulfuric acid is 0.70-1.50, then close the ...

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Abstract

The process of recovering and utilizing high polluted and low concentration waste acid liquid includes the following steps: multieffect concentrating and filtering waste water containing sulfuric acid; adding inorganic salt MX, where, X is Cl- or Br- and M is cation capable of forming soluble salt with sulfate radical, to react with the sulfuric acid to produce gas and mixed acid salt; and treating the mixed acid salt through neutralizing, depurating, decolorizing, refining and separating. The present invention provides one new way for treating and utilizing chemical waste water.

Description

technical field [0001] The invention relates to waste water treatment in the field of environmental protection, in particular to a comprehensive treatment and recycling method for high-pollution and low-concentration waste acid. Background technique [0002] Usually low-concentration waste sulfuric acid is treated by the following methods. 1. Adopt the method of cleaning and diverting, and use lime to neutralize and adsorb the mother liquor, but it will produce a large amount of secondary pollution solid waste. 2. The iron-carbon degradation and biological treatment method of mixing mother liquor and lotion is used. The disadvantage is that it consumes a lot of iron powder and high-cost chemical reagents. 3. Adopt other methods: such as ozone method, electrolysis method and strong oxidant method, there are also problems such as large energy consumption, high cost, and large waste of manpower. [0003] The applicant's prior Chinese invention patent application 200610049658....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/58C02F1/66
Inventor 赵国生方标唐勇阮海兴
Owner JIANGSU YUANZHENG CHEM
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