Method for preparing industrial salt through separation, evaporation and crystallization of coal chemical strong brine

A technology of evaporative crystallization and concentrated brine, which is applied in the direction of purification of alkali metal chlorides and alkali metal halides, can solve the problems of secondary pollution of resources and failure to be recycled, and achieve zero discharge, resource utilization, and saving The effect of energy consumption

Active Publication Date: 2014-10-01
中煤西安设计工程有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem of secondary pollution and resource failure in the existing coal chemical concentrated brine treatment

Method used

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  • Method for preparing industrial salt through separation, evaporation and crystallization of coal chemical strong brine
  • Method for preparing industrial salt through separation, evaporation and crystallization of coal chemical strong brine

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specific Embodiment approach 1

[0018] Specific embodiment one: In this embodiment, a method for preparing industrial salt by separating, evaporating and crystallizing concentrated brine in coal chemical industry is carried out according to the following steps:

[0019] 1. Add lime milk, coagulant and magnesium agent to the concentrated brine of the coal chemical industry, pass it into the clarification tank or coagulation sedimentation tank for chemical precipitation treatment, and obtain the concentrated brine after chemical precipitation;

[0020] 2. Put the concentrated brine after the chemical precipitation obtained in step 1 into the adjustment tank, and then adjust the pH to neutral to obtain neutral concentrated brine; there are two ways to adjust the pH: when the chemical precipitation obtained in step 1 CO in concentrated brine 3 - When the concentration is less than 500mg / L, use HCl to adjust the pH to neutral to obtain neutral concentrated brine; 3 - If the concentration is greater than 500mg / ...

specific Embodiment approach 2

[0036] Embodiment 2: This embodiment differs from Embodiment 1 in that the concentration of milk of lime in the concentrated brine of the coal chemical industry in step 1 is 3% to 10%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037]Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the coagulant in step 1 is polyferric chloride, and its dosage is 20 mg / L-100 mg / L. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing industrial salt with coal chemical strong brine, particularly to a method for preparing the industrial salt through separation, evaporation and crystallization of the coal chemical strong brine, and aims to solve the problems that secondary pollution exists and resources are not recycled in existing coal chemical strong brine treatment processes. The method comprises the steps as follows: 1, adding lime milk, a coagulant and a magnesium agent into the coal chemical strong brine, and feeding the coal chemical strong brine into a clarifying tank or a coagulative precipitation tank for chemical precipitation treatment; 2, adjusting the pH; 3, performing ultra-filtration treatment; 4, performing nano-filtration treatment; 5, performing single-effect evaporating crystallization or quadruple-effect evaporating crystallization to obtain the industrial salt. The method is used for treating the coal chemical strong brine and preparing the industrial salt from the coal chemical strong brine.

Description

technical field [0001] The invention relates to a method for preparing industrial salt from coal chemical concentrated brine. Background technique [0002] At present, the concentrated brine of the coal chemical industry comes from the concentrated water of the secondary reverse osmosis of the reclaimed water reuse device, the sewage of circulating water, and the recycled water of chemical water. The salt content of high salt water is as high as 10000~100000mg / L, mainly containing Na + 、K + , Ca 2+ , Mg 2+ 、Al 3+ , Mn 2+ , SO 4 2- , Cl - , NO 3- , NO 2- Plasma, where Na + The concentration reaches 10000mg / L~60000mg / L, Cl - The concentration can reach 10000mg / L~50000mg / L, SO 4 2- The concentration is 10000mg / L~50000mg / L. Another characteristic of the concentrated brine of the coal chemical industry is the high COD content, which is about 500mg / L-5000mg / L. [0003] The high salt content of the concentrated brine in the coal chemical industry makes it impossible...

Claims

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Application Information

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IPC IPC(8): C01D3/08C01D3/14
Inventor 韩洪军郑诗怡徐春艳
Owner 中煤西安设计工程有限责任公司
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