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A method for preparing high-purity industrial-grade crystalline salt by utilizing coal chemical concentrated brine

A technology of concentrated brine and coal chemical industry, applied in chemical instruments and methods, special compound water treatment, oxidized water/sewage treatment, etc., can solve the problems of low purity of industrial salt, membrane pollution, etc. The effect of purity and excellent influent water quality

Active Publication Date: 2017-08-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the purity of the industrial salt prepared in the existing method for preparing industrial grade sodium chloride from the concentrated brine of the coal chemical industry is not high, and there is membrane pollution when the industrial salt of the concentrated brine of the coal chemical industry is separated, and to provide a method for using Method for preparing high-purity industrial-grade crystalline salt from concentrated brine in coal chemical industry

Method used

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  • A method for preparing high-purity industrial-grade crystalline salt by utilizing coal chemical concentrated brine

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specific Embodiment approach 1

[0025] Specific implementation mode one: a kind of method of utilizing the concentrated brine of coal chemical industry to prepare high-purity industrial-grade crystalline salt according to the present embodiment is carried out according to the following steps:

[0026] 1. Adjusting the pH value of the adjustment tank: the raw water of the concentrated brine of the coal chemical industry is passed into the adjustment tank, and NaOH is added to the adjustment tank to make the pH value of the outlet water of the adjustment tank be 9-10, and the pH value adjustment is completed, and the coal with a pH value of 9-10 is obtained Chemical brine;

[0027] 2. Purification process: add calcium oxide, magnesium, sodium carbonate, coagulant and coagulant to the coal chemical brine obtained in step 1 with a pH value of 9 to 10 to remove heavy metals and silicon in the coal chemical brine Until the hardness of the effluent is less than 50mg / L, the silicon concentration of the effluent is l...

specific Embodiment approach 2

[0049] Embodiment 2: This embodiment differs from Embodiment 1 in that the coagulant described in step 2 is polyferric chloride. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0050] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the coagulation aid described in step 2 is polyacrylamide. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

A production method of high purity industrial grade crystalline salt by using strong brine in coal chemical industry is provided. The present invention relates to the fields of wastewater treatment and resource utilization, and particularly to a production method of high purity industrial grade crystalline salt by using strong brine in coal chemical industry. The invention aims to solve the problems of low purity of prepared industrial grade salt and membrane pollution in separation of strong brine in coal chemical industry and industrial grade salt in the production method of industrial grade common salt by using strong brine in coal chemical industry in the prior art. The method is as below: 1, adjustment of the pH value of an adjusting tank; 2, purification process; 3, the multi-media filter; 4, ion resin softening; 5, stripping process; 6, nanofiltration separation process; 7, advanced oxidation process; 8, anion resin process; and 9, evaporative crystallization process. The method employs special membrane process for effective isolation of salt; the main strong brine ingredient is monovalent salt; and the production of high purity industrial grade crystalline salt by using strong brine in coal chemical industry and resource utilization are realized.

Description

technical field [0001] The invention relates to the field of wastewater treatment and resource utilization, in particular to a method for preparing high-purity industrial-grade crystalline salt by using concentrated brine from coal chemical industry. Background technique [0002] In recent years, China's coal chemical industry has developed rapidly. Since coal chemical industry is a high water consumption and high pollution industry, the Ministry of Environmental Protection has put forward strict zero discharge requirements for coal chemical wastewater treatment. The new environmental protection law and a number of water resources policies introduced by the state since 2015 indicate that the treatment of coal chemical wastewater will face stricter requirements. Under the contradiction between the strict requirements of the Ministry of Environmental Protection, the strict management of national water resources and the development of the industry, the treatment of concentrated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/06
CPCC01D3/06C02F1/001C02F1/08C02F1/42C02F1/442C02F1/5236C02F1/56C02F1/66C02F1/725C02F1/78C02F9/00C02F2001/422C02F2301/08C02F2305/10
Inventor 韩洪军李琨方芳贾胜勇王德欣
Owner HARBIN INST OF TECH
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