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Treatment method of sulfuric acid high arsenic and thallium acid wastewater

A technology of acidic wastewater and treatment method, which is applied in the treatment of thallium acidic wastewater and the field of high arsenic in sulfuric acid, which can solve the problems of unstable treatment effect and high treatment cost of sulfuric acid acidic wastewater, making it easy for employees to master, strong operability, simple and clear operation Effect

Pending Publication Date: 2021-08-17
SHUI KOU SHAN NONFERROUS METALS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a treatment method for acidic wastewater with high arsenic and thallium in sulfuric acid. Aiming at the problem that the treatment effect of sulfuric acid acidic wastewater in lead smelters is unstable and the treatment cost is high, a four-stage The process treatment method achieves the purpose of good sulfuric acid acid wastewater treatment effect and cost reduction

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  • Treatment method of sulfuric acid high arsenic and thallium acid wastewater

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Effect test

Embodiment 1

[0027] Refer to attached figure 1 , the treatment method of sulfuric acid high arsenic, thallium acidic waste water, comprises the following steps:

[0028] Add limestone to the sewage for neutralization, the control condition is that the pH end point is 2, enter the first-stage thickener, and press the bottom flow to obtain a first-stage neutralization slag, add permeate water into the clear liquid to enter the second-stage oxidation reaction, add hydrogen peroxide 2kg / m 3 and iron salt 1kg / m 3 , and then go through the second-stage and second-stage neutralization, the first-stage neutralization and the second-stage neutralization are respectively added with milk of lime and aerated for 30 minutes. After neutralization, the pH of the liquid is 11.5, and it enters the second-stage thickener. Press filtration to obtain the second-stage neutralization slag, and the clear liquid enters the three-stage pH adjustment tank successively. In the three-stage pH adjustment tank, there ...

Embodiment 2

[0030] Refer to attached figure 1 , the treatment method of sulfuric acid high arsenic, thallium acidic waste water, comprises the following steps:

[0031] Add limestone to the sewage for neutralization, the control condition is that the pH end point is 2, enter the first-stage thickener, and press the bottom flow to obtain a first-stage neutralization slag, add permeate water into the clear liquid to enter the second-stage oxidation reaction, add hydrogen peroxide 2kg / m 3 and iron salt 1kg / m 3 , and then go through the second-stage and second-stage neutralization, the first-stage neutralization and the second-stage neutralization are respectively added with milk of lime and aerated for 40 minutes. After neutralization, the pH of the liquid is 12, and it enters the second-stage thickener. Press filtration to obtain the second-stage neutralization slag, and the clear liquid enters the three-stage pH adjustment tank successively. In the three-stage pH adjustment tank, there is...

Embodiment 3

[0033] Refer to attached figure 1 , the treatment method of sulfuric acid high arsenic, thallium acidic waste water, comprises the following steps:

[0034] Add limestone to the sewage for neutralization, the control condition is that the pH end point is 2, enter the first-stage thickener, and press the bottom flow to obtain a first-stage neutralization slag, add permeate water into the clear liquid to enter the second-stage oxidation reaction, add hydrogen peroxide 2kg / m 3 and iron salt 1kg / m 3 , and then after two stages of secondary neutralization, lime milk is added to the primary neutralization and secondary neutralization and aerated for 30-40 minutes respectively. After neutralization, the pH of the liquid is 11.7, and it enters the second stage thickener , underflow pressure filtration, to obtain the second-stage neutralization slag, and the clear liquid enters the three-stage pH adjustment tank successively. In the three-stage pH adjustment tank, there is a sulfuric ...

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Abstract

The invention provides a treatment method of sulfuric acid high arsenic and thallium acid wastewater, the treatment method comprises the following steps: adding limestone into sewage for neutralization, entering a first-stage thickener, carrying out underflow filter pressing to obtain first-stage neutralized slag, adding permeate water into clear liquid, carrying out second-stage oxidation reaction, then carrying out second-stage secondary neutralization, entering a second-stage thickener, carrying out underflow filter pressing, obtaining second-stage neutralized slag, enabling the clear liquid to sequentially enter a third-section pH adjusting tank, a third-section first-stage neutralizing tank, a third-section oxidation tank and a third-section second-stage neutralizing tank to enter a third-section thickener, peforming underflow filter pressing to obtain third-stage neutralized slag, enabling the clear liquid to sequentially enter a fourth-section vulcanization tank 1 and a fourth-section vulcanization tank 2 to enter a fourth-section thickener, performing underflow filter pressing to obtain fourth-stage slag, enabling the clear liquid to enter a pressurized water tank, and recycling. The method has the advantages of strong application operability, strong process flow continuity, segmented treatment and simple operation, and is suitable for treating polluted acid (waste water) with high arsenic and thallium content.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for sulfuric acid high arsenic and thallium acidic wastewater. Background technique [0002] The existing sulfuric acid high arsenic and thallium acid wastewater treatment method pretreatment process adopts the lime neutralization method to increase the pH value to above 12 at one time, accelerate the reaction through the pressurized air in the thickener, pump it to the filter press for pressure filtration, and the filtrate passes through After the three-stage neutralization tank overflows to the electrochemical process for advanced treatment, the effect of this method is unstable after the pretreatment process, especially the arsenic and thallium sometimes exceed the water intake requirements of the electrochemical process, resulting in further increase in treatment costs. In addition, sulfuric acid acid wastewater also adopts the method of secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/20
CPCC02F9/00C02F1/66C02F1/722C02F2305/026C02F1/58C02F1/62C02F1/52C02F1/001C02F2301/08C02F2101/103C02F2101/20C02F2209/06
Inventor 唐剑
Owner SHUI KOU SHAN NONFERROUS METALS LTD
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