Method of reclaiming and using high-pollution low-concentration waste acid

A low-concentration, acid recovery technology, applied in chemical instruments and methods, heating water/sewage treatment, alkali metal sulfite/sulfite, etc., can solve the problem of iron powder consumption, large manpower waste, large secondary pollution solid Waste and other problems, to achieve the effect of saving wastewater treatment costs

Inactive Publication Date: 2007-10-24
ZHEJIANG RUNTU
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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

Method used

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  • Method of reclaiming and using high-pollution low-concentration waste acid
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  • Method of reclaiming and using high-pollution low-concentration waste acid

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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 invention discloses a high-pollution low-density recycling and utilizing method of waste acid, which is characterized by the following: adding the waste water with sulphuric acid into inorganic salt MX to react with sulphuric acid after multi-effective concentration and filtering to remove impurity; generating with gas and acid composite salt; utilizing the acid composite salt or refining and separating through neutralizing, removing impurity and decoloring. The X in the halogenated salt is Cl-or Br-and M is cation to form soluble sulfate with sulfuric radical. The invention modifies and improves the disposing method to recycle and utilize low-density waste acid, which saves waste water disposing cost to provide a new resource integrated concept.

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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IPC IPC(8): C01B7/01C01D3/04C01D5/00C01F5/26C02F1/04
Inventor 赵国生方标唐勇阮海兴
Owner ZHEJIANG RUNTU
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