Treatment method of high-concentration salt-containing waste sulfuric acid

A high-concentration salt-containing, treatment method technology, applied in the field of high-concentration salt-containing waste sulfuric acid, can solve the problems that landfills do not want to accept salt mud for landfill, salt mud cannot be disposed of, and are piled in warehouses, etc., to achieve Achieve resource utilization, save evaporation energy consumption, and reduce the effect of wastewater salinity

Active Publication Date: 2019-12-31
中广核宏达环境科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex composition and many impurities, the salt mud produced cannot be effectively utilized
Considering that salt leaching leads to excessive salinity in leachate, which affects the normal operation of the leachate treatment system, landfills are unwilling to accept salt mud for landfill
Therefore, the use of evaporation and crystallization after neutralization to deal with salt-containing waste acid leads to the problem that the salt mud cannot be disposed of and piled up in the warehouse

Method used

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  • Treatment method of high-concentration salt-containing waste sulfuric acid
  • Treatment method of high-concentration salt-containing waste sulfuric acid

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Effect test

Embodiment 1

[0034] The processing method of high-concentration saline waste sulfuric acid in the present embodiment comprises:

[0035] (1) take quicklime as neutralizing agent, quicklime and water are configured into the slurry of 200g / L concentration;

[0036] (2) Add 2m into the reaction tank 3 The high-concentration salt-containing waste sulfuric acid, the measured pH value of the high-concentration salt-containing waste sulfuric acid is 1.6, the sulfate ion concentration is 51.9g / L, and the chloride ion concentration is 12.8g / L. Add 7kg of induced agent, stir evenly;

[0037] (3) Gradually add the slurry to the reaction tank, keep stirring during the reaction, the stirring speed is 100r / min, measure the pH value of the material liquid in real time, when the pH value is 4, stop adding the slurry, and continue stirring to 1 Hour;

[0038] (4) Add the calcium chloride powder of 4.4kg in the reaction tank, stir evenly, the stirring speed is 100r / min, and the stirring time is 1 hour; ...

Embodiment 2

[0041] The processing method of high-concentration saline waste sulfuric acid in the present embodiment comprises:

[0042] (1) take quicklime as neutralizing agent, quicklime and water are configured into the slurry of 200g / L concentration;

[0043] (2) Add 2m into the reaction tank 3 The high-concentration salt-containing waste sulfuric acid, the measured pH value of the high-concentration salt-containing waste sulfuric acid is 1.1, the sulfate ion concentration is 58.5g / L, and the chloride ion concentration is 18.3g / L. Add 15kg of induced agent, stir evenly;

[0044] (3) Gradually add the slurry to the reaction tank, keep stirring during the reaction, the stirring speed is 100r / min, measure the pH value of the material liquid in real time, when the pH value is 3, stop adding the slurry, and continue stirring to 1 Hour;

[0045] (4) Add the calcium chloride powder of 2.0kg in the reaction tank, stir evenly, the stirring speed is 100r / min, and the stirring time is 1 hour; ...

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Abstract

The invention provides a treatment method of high-concentration salt-containing waste sulfuric acid. The treatment method comprises: (1) preparing a material slurry with a certain concentration from quicklime or limestone and water; (2) adding a proper amount of an inducer into a reaction tank containing high-concentration salt-containing waste sulfuric acid; (3) adding the material slurry into the reaction tank, stirring, measuring the pH value, stopping the adding of the material slurry when the pH value is increased to 3-5, and continuously stirring for a certain time; (4) adding a proper amount of calcium chloride into the reaction tank, and stirring for a certain time; and (5) filtering the solution in the reaction tank, carrying out evaporative crystallization on the filtrate, and drying the filter residue to obtain calcium sulfate dihydrate. With the treatment method of the invention, the salt content of the wastewater entering the evaporator can be greatly reduced, the evaporation energy consumption can be reduced, the yield of salty mud can be greatly reduced, the calcium sulfate dihydrate can be obtained, and the resource utilization of the high-concentration salt-containing waste sulfuric acid can be achieved.

Description

technical field [0001] The invention relates to the technical field of waste sulfuric acid treatment, in particular to a treatment method for high-concentration salt-containing waste sulfuric acid. Background technique [0002] Salt-containing waste sulfuric acid mainly comes from the production process of industrial enterprises engaged in metal surface treatment and electronic component manufacturing. For example, in the manufacturing process of electronic components, it is necessary to use acid for electrolytic degreasing, acid etching, sensitization before activation, catalysis, and brightening. Or in the production process of integrated circuit boards, it is necessary to use an acid etchant for oxide etching, and a large amount of high-salt waste acid solution will also be produced. For example, in metal surface treatment and other industries, it is necessary to use acid for surface cleaning, use sulfuric acid for acid etching, electrolytic degreasing, surface sensitiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/46C02F11/13C02F101/10
CPCC02F9/00C01F11/46C02F11/12C02F1/001C02F1/66C02F1/04C02F2101/101
Inventor 杨小兵李锦胡肖怡刘洪李旭东崔雨晴
Owner 中广核宏达环境科技有限责任公司
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