Method and device for treating polluted acid containing thallium and arsenic

A technology of arsenic polluted acid and polluted acid, which is applied in the direction of filtration treatment, special treatment targets, multi-stage water treatment, etc. It can solve problems such as difficult discharge or quick return, harsh working environment, and poor quality of supernatant water, etc., to achieve equipment The corrosion is small, the effluent is stable and up to standard, and the effect of easy maintenance

Pending Publication Date: 2020-09-08
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is difficult to carry out environmental protection treatment of heavily polluted sewage and polluted acid. Although there are various treatment methods, there are still many shortcomings, such as high operating costs, large floor area, and harsh working environment. The water quality of the supernatant is poor, and it is difficult to pass the discharge or quickly return it as industrial water for recycling, resulting in environmental pollution and waste of water resources

Method used

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  • Method and device for treating polluted acid containing thallium and arsenic
  • Method and device for treating polluted acid containing thallium and arsenic
  • Method and device for treating polluted acid containing thallium and arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The sewage acid of a smelter contained 956mg / L of arsenic, 10.3mg / L of thallium, 29g / L of sulfuric acid, and the total amount of sewage was 400t / d.

[0054] S1 sewage acid neutralization section

[0055] Such as figure 1 As shown, the thallium- and arsenic-containing polluted acid is sent to the polluted acid neutralization reaction tank 1, and a limestone solution with a mass concentration of 25% is added to the polluted acid neutralization reaction tank 1 to carry out neutralization reaction and control the pH of the effluent clear liquid 2.5, the bottom mud is sent to the filter press for filtration, and the obtained sludge is sent to the smelting furnace for batching, which can effectively use the sludge and reduce the discharge of sludge.

[0056] S2, an oxidation stage

[0057] Send the effluent obtained in S1 into the first reaction tank 2 of the first-stage oxidation section, add ferrous sulfate to the first reaction tank 2 of the first-stage oxidation section...

Embodiment 2

[0064] Such as figure 2 and 3As shown, the liquid after sewage acid treatment obtained in Example 1 is sent into the membrane treatment device 9, the liquid after sewage acid treatment is pressurized to the regulating tank 910 by a pump, and the waste water in the regulating pool 910 is lifted to the first reaction tank 911 by a pump In the first reaction tank 911, calcium hydroxide is added to remove the temporary hardness in the water, and the effluent enters the second reaction tank 912, and sodium carbonate is added to the second reaction tank 912 to remove the permanent hardness in the water, and the effluent enters the coagulation sedimentation pool 913, add coagulant to the coagulation sedimentation tank 913 to further remove various impurities in the water, and pressurize the underflow to the filter press with a sludge pump. The supernatant flows into the pressurized water pool 914, and is sent to the filter 915 by a pressurized pump, and the effluent enters the ultr...

Embodiment 3-4

[0069] The method is the same as in Example 1, except that the content of thallium and arsenic in the polluted acid is different and the pH value control in steps S3 and S4 is different.

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PUM

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Abstract

The invention discloses a method for treating polluted acid containing thallium and arsenic. The method comprises the following steps: S1, adding the polluted acid into limestone for neutralization, and controlling the pH value of the filtered effluent to be 2-4; S2, sending the effluent obtained in step S1 into a first reaction tank of a first-stage oxidation section, adding ferrous sulfate intothe first reaction tank, sending the effluent into a second reaction tank of the first-stage oxidation section, and adding hydrogen peroxide into the second reaction tank; S3, sending the effluent ofthe first-stage oxidation section and the second reaction tank into a first-stage neutralizing tank, adding lime milk, and controlling the pH value of the filtered effluent to 8.5-9.5; and S4, sendingthe first-stage neutralization section outlet liquid in step S3 into a first reaction tank in a second-stage oxidation section, adding lime milk and ferrous sulfate, sending the outlet liquid into asecond reaction tank in the second-stage oxidation section, introducing compressed air, controlling the pH value to be 8.5-9.5, reacting, and filtering to obtain a treated waste acid liquid. Accordingto the method, thallium and arsenic in the acid can be effectively removed, and the removal rate can reach 99.9% or above.

Description

technical field [0001] The invention belongs to the technical field of polluted acid treatment, and in particular relates to a method for treating polluted acid containing thallium and arsenic. In particular, the invention also relates to a device for treating polluted acid containing thallium and arsenic. Background technique [0002] During the metal smelting process, a large amount of polluted acid will be produced, generally containing high concentrations of harmful components, such as acid, thallium, arsenic, etc., which will cause great damage to human body and organisms, and it is necessary to carry out environmental protection treatment. The most commonly used method for sewage and acid treatment is the chemical deposition method, which generally uses alkaline substances such as hydroxides and sulfides, as well as coagulants such as iron salts and alum (aluminum sulfate), and undergoes multi-stage neutralization, aeration, Sedimentation, filtration, solid-liquid sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10C02F101/20C02F101/10
CPCC02F1/001C02F1/048C02F1/441C02F1/444C02F1/5281C02F1/66C02F1/722C02F1/74C02F9/00C02F2101/103C02F2101/20C02F2209/06C02F2301/08C02F2303/06C02F2303/14C02F2305/026
Inventor 李秒孙文亮
Owner CHINA ENFI ENGINEERING CORPORATION
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