Method for purification of salt-making brine by recycling sodium carbonate solution

A technology of brine purification and heat recovery, which is applied in the fields of alkali metal halide purification, alkali metal chloride, application, etc., can solve the problems of soda ash consumption and benefit loss, and achieve the effects of reducing environmental pollution, reducing use, and reducing production costs

Inactive Publication Date: 2018-05-18
HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This purification method needs to consume soda ash, resulting in loss of benefits

Method used

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  • Method for purification of salt-making brine by recycling sodium carbonate solution
  • Method for purification of salt-making brine by recycling sodium carbonate solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation steps:

[0029] A) The original halogen is introduced into the primary reactor, and the caustic soda solution is added to fully stir the reaction. The content of NaOH in the caustic soda solution is 10mol / L, the volume ratio of the caustic soda solution to the original halogen is 1:100, and the reaction time is 30 minutes. primary slurry;

[0030] B) Settling the primary slurry obtained in step A), adding a flocculant, the addition amount is 1ppm, and the settling time is 60 minutes to obtain the primary supernatant and the primary lower layer mud;

[0031] C) the first-level supernatant liquid obtained in step B) is introduced into the secondary reactor, and the first-level lower layer mud is discharged to the mud collection device, and the hot lye discharged by the hot lye tower is introduced into the secondary reactor simultaneously, The temperature of the introduced hot lye is 70°C, Na in the hot lye 2 CO 3 The content of lye is 10mol / L, the volume ra...

Embodiment 2

[0035] Preparation steps:

[0036] A) The original halogen is introduced into the primary reactor, and the caustic soda solution is added to fully stir the reaction. The content of NaOH in the caustic soda solution is 19mol / L, the volume ratio of the caustic soda solution to the original halogen is 3:100, and the reaction time is 100 minutes. primary slurry;

[0037] B) Settling the primary slurry obtained in step A), adding a flocculant, the addition amount is 5ppm, and the settling time is 150 minutes to obtain the primary supernatant and the primary mud;

[0038] C) the first-level supernatant liquid obtained in step B) is introduced into the secondary reactor, and the first-level lower layer mud is discharged to the mud collection device, and the hot lye discharged by the hot lye tower is introduced into the secondary reactor simultaneously, The temperature of the introduced hot lye is 80°C, Na in the hot lye 2 CO 3 The content of lye is 2.5mol / L, the volume ratio of th...

Embodiment 3

[0042] Preparation steps:

[0043] A) The original halogen is introduced into the primary reactor, and the caustic soda solution is added to fully stir the reaction. The content of NaOH in the caustic soda solution is 15mol / L, the volume ratio of the caustic soda solution to the original halogen is 2:100, and the reaction time is 60 minutes. primary slurry;

[0044] B) Settling the primary slurry obtained in step A), adding a flocculant, the addition amount is 2ppm, and the settling time is 100 minutes to obtain the primary supernatant and the primary mud;

[0045] C) the first-level supernatant liquid obtained in step B) is introduced into the secondary reactor, and the first-level lower layer mud is discharged to the mud collection device, and the hot lye discharged by the hot lye tower is introduced into the secondary reactor simultaneously, The temperature of the introduced hot lye is 75°C, Na in the hot lye 2 CO 3The content of lye is 1.5mol / L, the volume ratio of the ...

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Abstract

The invention relates to the field of brine purification, and discloses a method for purification of salt-making brine by recycling a sodium carbonate solution. The method comprises the following steps: introducing raw brine into a first-stage reactor, adding a caustic soda solution, and carrying out a reaction under full stirring so as to obtain a first-grade slurry; settling the first-grade slurry so as to obtain a first-grade supernatant liquid and a first-grade subnatant sludge; introducing the first-grade supernatant liquid into a second-stage reactor, introducing a sodium carbonate solution discharged from a sodium carbonate solution tower into the second-stage reactor at the same time, and carrying out a reaction under full stirring so as to obtain a second-grade slurry; settling the second-grade slurry so as to obtain a second-grade supernatant liquid and a second-grade subnatant sludge; and introducing the second-grade supernatant liquid into a salt making device, and carryingout evaporation and crystallization so as to produce a salt product. The method for purification of the salt-making brine by recycling the sodium carbonate solution provided by the invention solves the problem of utilization of the sodium carbonate solution, reduces the use of solid sodium carbonate at the same time, greatly reduces the production cost of enterprises, and has high purification and removal rate.

Description

technical field [0001] The invention relates to the field of brine purification, in particular to a method for recovering hot lye for purifying salt-making brine. Background technique [0002] The gas produced by the calcination and decomposition of heavy alkali contains a certain amount of fine alkali powder. After spraying and washing with clean water, the fine alkali powder dissolves in clean water to form a 2 CO 3 solution, commonly known as hot lye. Hot lye continuously dissolves alkali dust during the cycle washing process, and the alkali concentration continues to rise, its ability to dissolve alkali dust continues to decline, and the washing effect becomes worse. Therefore, it is necessary to continuously replenish furnace gas condensate (or clean water) and remove some Hot lye to maintain the dynamic balance of the amount of hot lye. [0003] In the prior art, combined alkali-ammonia alkali joint production enterprises generally can only be sent to the ammonia-al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D3/16C05D11/00
CPCC01D3/06C01D3/16C05D3/02C05D5/00
Inventor 李元海彭善俊黄登兵张立武王洪林李亮
Owner HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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