Advanced treatment method of concentrated sulfuric acid waste liquor

A technology of advanced treatment and concentrated sulfuric acid, applied in filtration treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of huge waste landfill fees and wastewater treatment fees, waste of sulfuric acid resources, etc., to reduce costs and process Simplicity and the effect of improving recycling efficiency

Inactive Publication Date: 2016-05-11
DONGJIANG ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking lime neutralization as an example, to treat one ton of waste sulfuric acid with a concentration of about 80%, it needs to consume about 1 ton of lime, and produce about 5.5 tons of waste residue and 6 tons of waste water, which not only wastes a lot of sulfuric acid resources, but also produces Huge landfill fees and wastewater treatment fees

Method used

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  • Advanced treatment method of concentrated sulfuric acid waste liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Provide concentrated sulfuric acid waste liquid to be treated. The sulfuric acid content in the concentrated sulfuric acid waste liquid is 80.2%, the characteristic COD content is 138g / L, and the iron ion content is 3.59g / L.

[0051]Take 10L of the above-mentioned concentrated sulfuric acid waste liquid, add 7L of diluent to the buffer tank for dilution, obtain the diluted liquid after cooling, and filter the diluted liquid with a sand core filter and a security filter in turn to obtain the first filtrate. The sulfuric acid content in the first filtrate was 50.6%, the characteristic COD content was 12.9 g / L, and the iron ion content was 1.9 g / L. The diluent is the raffinate obtained in the previous treatment, and its sulfuric acid content is 8.3%.

[0052] Adjust the flow rate of the first filtrate of the diffusion dialyzer to be 14mL / min, and the flow rate of tap water to be 15mL / min. After the first filtrate is separated and treated in the diffusion dialyzer for 3 ho...

Embodiment 2

[0056] Provide concentrated sulfuric acid waste liquid to be treated. The sulfuric acid content in the concentrated sulfuric acid waste liquid is 80.2%, the characteristic COD content is 138g / L, and the iron ion content is 3.59g / L.

[0057] Take 10L of the above-mentioned concentrated sulfuric acid waste liquid, add 7L of diluent to the buffer tank for dilution, obtain the diluted liquid after cooling, and filter the diluted liquid with a sand core filter and a security filter in turn to obtain the first filtrate. The diluent is the raffinate in Example 1.

[0058] Adjust the flow rate of the first filtrate of the diffusion dialyzer to be 14mL / min, and the flow rate of tap water to be 15mL / min. After the first filtrate is separated and treated in the diffusion dialyzer for 3 hours, the water will form a recovered liquid, and the first filtrate will form a raffinate, and the outlet The flow rate of the recovered liquid was 15.3 mL / min, and the flow rate of the raffinate was 13...

Embodiment 3

[0062] Provide concentrated sulfuric acid waste liquid to be treated. The sulfuric acid content in the concentrated sulfuric acid waste liquid is 80.2%, the characteristic COD content is 138g / L, and the iron ion content is 3.59g / L.

[0063] Take 10L of the above-mentioned concentrated sulfuric acid waste liquid, add 7L of diluent to the buffer tank for dilution, obtain the diluted liquid after cooling, and filter the diluted liquid with a sand core filter and a security filter in turn to obtain the first filtrate. The diluent is the raffinate in Example 2.

[0064] Adjust the flow rate of the first filtrate of the diffusion dialyzer to be 12mL / min, and the flow rate of tap water to be 13mL / min. After the first filtrate is separated and treated in the diffusion dialyzer for 3 hours, the water will form a recovered liquid, and the first filtrate will form a raffinate, and the outlet The flow rate of the recovered liquid was 13.2 mL / min, and the flow rate of the raffinate was 11...

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Abstract

The invention discloses an advanced treatment method of concentrated sulfuric acid waste liquor, which comprises the following steps: providing concentrated sulfuric acid waste liquor to be treated, adding a diluter for dilution until the mass percent of sulfuric acid in the concentrated sulfuric acid waste liquor is 40-60%, cooling to obtain a dilute solution, filtering the dilute solution, and maintaining a first filtrate, wherein the mass percent of sulfuric acid in the diluter is 3-15%; respectively putting water and the first filtrate on two sides which are divided by an anionic homogeneous membrane, and carrying out sufficient treatment, wherein the water forms a recovery solution, and the first filtrate forms a residual liquid; and adding an adsorbent into the recovery solution, carrying out sufficient treatment, filtering, and maintaining a second filtrate which is the sulfuric acid recovery solution. The advanced treatment method disclosed by the invention is simple in technique; and after the residual liquid is recovered three times, more than 95% of sulfuric acid in the concentrated sulfuric acid waste liquor can be recovered. Compared with the traditional treatment technique by direct neutralization, only less than 5% of the sulfuric acid residual liquid is subjected to neutralizing treatment in the technique disclosed by the invention, thereby greatly lowering the treatment cost.

Description

technical field [0001] The invention relates to an advanced treatment method for concentrated sulfuric acid waste liquid. Background technique [0002] During the painting production process of iron parts of small household appliances (such as electric fan net cover, etc.), some defective products with poor painting effect will be produced. In the industry, concentrated sulfuric acid is usually used to deal with them, that is, these defective products are put into cages and placed directly Soak it in a concentrated sulfuric acid pool with a concentration of 95% to 98% for about 10 hours to sulfonate and carbonize the coating paint on the surface of the defective product, then remove it by high-pressure water washing, and then paint it to make a finished product. After concentrated sulfuric acid is used for a certain period, with the increase of organic matter and the decrease of sulfuric acid concentration, its paint stripping effect will be greatly reduced, and it needs to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02
CPCC02F9/00C02F1/001C02F1/281C02F1/44C02F2301/08
Inventor 吴文彪张艳华徐文彬袁城
Owner DONGJIANG ENVIRONMENTAL
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