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Refined salt preparation process from salt production waste liquid

A preparation process and technology for refining salt, applied in the field of salt production, can solve problems such as reducing salt crystallization, and achieve the effects of improving utilization rate, speeding up and reducing environmental pollution

Active Publication Date: 2018-09-28
新疆盐湖制盐有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents do not use the existing semi-permeable membrane technology to reduce the labor intensity, and at the same time, the precipitation of salt crystals is reduced due to the increase of water temperature after the mother liquor is thickened.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] a. Measure 500L of waste liquid from salt production, divide it into 5 parts on average, each part is 100L, and each part will be filtered through a semi-permeable membrane for 15 minutes to obtain a concentration of 60L primary liquid with a concentration of 28°Be'.

[0014] b. Heating 60L of primary liquid obtained in step a to 100°C, evaporating for 50 minutes, and concentrating to obtain 20L of secondary liquid with a concentration of 32°Be'.

[0015] c. Cool down the temperature of the secondary liquid obtained in step b to 10° C. and maintain it for 200 minutes to obtain crystalline salt slurry and secondary waste liquid.

[0016] d. Collect 5 parts of 100 L crystallization salt slurry obtained in step c together with the secondary waste liquid, and separate the crystallization salt slurry and secondary waste liquid by filtration to obtain 40 L crystallization salt slurry.

[0017] e. Pour the 40L crystalline salt slurry collected in step d into a salt washer and ...

Embodiment 2

[0020] a. Measure 490L of waste liquid from salt production, divide it into 7 parts on average, each part is 70L, and each part will be filtered through a semi-permeable membrane for 30 minutes to obtain a concentration of 45L primary liquid of 29°Be'.

[0021] b. Heating 45L of primary liquid obtained in step a to 120°C, evaporating for 30 minutes, and concentrating to obtain 15L of secondary liquid with a concentration of 33°Be'.

[0022] c. Cool down the secondary liquid obtained in step b to 20° C. and maintain it for 100 minutes to obtain crystalline salt slurry and secondary waste liquid.

[0023] d. Collect 7 parts of crystalline salt slurry and secondary waste liquid obtained in total 105 L through step c, and separate the crystalline salt slurry and secondary waste liquid by filtration to obtain 42 L of crystalline salt slurry.

[0024] e. Pour the 42L crystalline salt slurry collected in step d into a salt washer and wash it with saturated brine. After washing, the c...

Embodiment 3

[0027] a. Measure 640L of salt-making waste liquid, divide it into 8 parts on average, each part is 80L, and each part will be filtered through a semipermeable membrane for 60 minutes to obtain a concentration of 51L primary liquid of 31°Be'.

[0028] b. Heat 51L of primary liquid obtained in step a to 90°C, evaporate for 30 minutes, and concentrate to obtain 17L of secondary liquid with a concentration of 32°Be'.

[0029] c. Cool the secondary liquid obtained in step b to 30° C. and maintain it for 300 minutes to obtain crystallized salt slurry and secondary waste liquid.

[0030] d. Collect 5 parts of the crystalline salt slurry and secondary waste liquid obtained in total 136 L through step c, and separate the crystalline salt slurry and secondary waste liquid by filtration to obtain 50 L of crystalline salt slurry.

[0031] e. Pour the 50L crystalline salt slurry collected in step d into a salt washer and wash it with saturated brine. After washing, the crystalline salt sl...

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PUM

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Abstract

The invention discloses a refined salt preparation process from salt production waste liquid. The refined salt preparation process includes the steps of (a) semi-permeable filtering, (b) evaporative thickening, (c) separating crystallization by cooling temperature, (d) collecting crystals, (e) washing and dewatering, and (f) drying and packaging; wherein the step of (a) semi-permeable filtering includes filtering salt production waste liquid by a semi-permeable membrane, adding the concentration of the salt production waste no less than 28 DEG Be' to obtain primary liquid; the step of (b) evaporative thickening includes evaporating the primary liquid obtained in the step (a) by heating; the step of (c) the separating crystallization by cooling temperature includes cooling the secondary liquid obtained by step (b) and generating crystalline salt and secondary waste liquid; the step of (d) the collecting crystals includes collecting and filtering the crystalline salt and secondary wasteliquid obtained by step (c) through a multichannel parallel method. The preparation process has the advantages that the labor force intensity is reduced because of using the semi-permeable membrane toprepare the primary liquid, and the speed of forming crystalline salt is enhanced because of separating crystallization by cooling temperature after the evaporative thickening, the efficiency of crystalline salt is increased, the using rate of the salt production waste is enhanced, the loss of salt production waste is reduced, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of salt production, in particular to a preparation process for producing refined salt using salt production waste liquid as a raw material. Background technique [0002] Salt is widely used in industry and is one of the most basic raw materials in the chemical industry, known as the "mother of the chemical industry". Among the main products of the basic chemical industry, hydrochloric acid, caustic soda, soda ash, ammonium chloride, and chlorine gas are mainly produced from industrial salt. A large amount of sodium chloride is needed in the organic synthesis industry. In addition, it is also used in soap manufacturing, ceramics, glass production, daily chemical industry, oil drilling, drilling fluid, completion fluid, petrochemical dehydration fluid, early strength agent in the construction industry, coagulant in the production of coatings, latex coagulant in the rubber industry , paper industry additives and waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06
CPCC01D3/06
Inventor 李军忠陆培南何晓龙马晓林
Owner 新疆盐湖制盐有限责任公司