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Technology for recovering washing mother liquid containing magnesium sulfate

A mother liquor recovery, magnesium sulfate technology, applied in magnesium sulfate, alkali metal chloride and other directions, can solve problems such as increased production cost, low yield of inorganic salts, environmental pollution, etc., and achieves high recovery rate, no three waste discharge, technological process Refined effect

Inactive Publication Date: 2015-02-18
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The known by-product mixed salt washing mother liquor (containing salt, magnesium sulfate, potassium chloride, magnesium chloride) in the process of producing potassium chloride by the known brine method generally adopts the method of direct discharge, and is discharged to the external environment, wherein the salt, magnesium sulfate , Potassium Chloride, and Magnesium Chloride are not recycled, and the yield of inorganic salts such as Potassium Chloride and Magnesium Sulfate is low, which increases the consumption of raw materials and energy for the production of Potassium Chloride, increases production costs, and causes great pollution to the environment.
Therefore, the economical efficiency of the current production of potassium chloride by the brine method needs to be improved. In addition, in order to meet the national policy requirements of energy-saving and emission-reduction scientific development, the existing process also needs to be improved.

Method used

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  • Technology for recovering washing mother liquid containing magnesium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 30m 3 The washing mother liquor of magnesium sulfate (containing salt 61.82g / l, magnesium sulfate 113.97g / l, potassium chloride 50.71g / l, magnesium chloride 196.44g / l) containing the magnesium sulfate of components such as salt, magnesium sulfate, potassium chloride, magnesium chloride is Raw materials, with 309m 3 Salt making mother liquor (commonly known as bittern, containing 108.08g / l salt, 100.78g / l magnesium sulfate, 34.28g / l potassium chloride, 147.49g / l magnesium chloride) mixed, its 339m 3 Mixed solution (salt content 19.59g / l, magnesium sulfate 22.68g / l, potassium chloride 46.33g / l, magnesium chloride 438.36g / l), mixing temperature 57°C;

[0016] 339m 3 Mixed solution (19.59g / l salt, 22.68g / l magnesium sulfate, 46.33g / l potassium chloride, 438.36g / l magnesium chloride) and 133m 3 Potassium-making mother liquor (commonly known as old brine, containing 7.40g / l of salt, 24.08g / l of magnesium sulfate, 2.71g / l of potassium chloride, 455.93g / l of magnesium c...

Embodiment 2

[0020] Take 30m 3 The washing mother liquor of magnesium sulfate containing salt, magnesium sulfate, potassium chloride, magnesium chloride and other components (containing salt 61g / l, magnesium sulfate 115g / l, potassium chloride 50g / l, magnesium chloride 195g / l) is raw material, and 315m 3 Salt-making mother liquor (commonly known as bittern, containing 105g / l of salt, 102g / l of magnesium sulfate, 35g / l of potassium chloride, 150g / l of magnesium chloride) is mixed, and its 345m 3 Mixed solution (salt 19g / l, magnesium sulfate 21g / l, potassium chloride 45g / l, magnesium chloride 435g / l), mixing temperature 58°C;

[0021] 345m 3 Mixed solution (salt 19g / l, magnesium sulfate 21g / l, potassium chloride 45g / l, magnesium chloride 435g / l) and 135m of potassium chloride produced by the brine method 3 Potassium-making mother liquor (commonly known as old brine, containing 7.40g / l of salt, 24.0g / l of magnesium sulfate, 2.7g / l of potassium chloride, 456g / l of magnesium chloride) is mixed...

Embodiment 3

[0025] Take 30m 3 The washing mother liquor of magnesium sulfate (containing salt 61.82g / l, magnesium sulfate 113.97g / l, potassium chloride 50.71g / l, magnesium chloride 196.44g / l) containing the magnesium sulfate of components such as salt, magnesium sulfate, potassium chloride, magnesium chloride is Raw materials, with 300m 3 Salt making mother liquor (commonly known as bittern, containing 110g / l of salt, 102g / l of magnesium sulfate, 35g / l of potassium chloride, 149g / l of magnesium chloride) mixed, its 330m 3 Mixed solution (salt 20g / l, magnesium sulfate 23g / l, potassium chloride 47g / l, magnesium chloride 439g / l), mixing temperature 56°C;

[0026] 330m 3 Mixed solution (20g / l salt, 23g / l magnesium sulfate, 47g / l potassium chloride, 439g / l magnesium chloride) and 130m of potassium chloride produced by the brine method 3 Potassium-making mother liquor (commonly known as old brine, containing 7.50g / l of salt, 25.0g / l of magnesium sulfate, 2.90g / l of potassium chloride, 458g / l...

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Abstract

The invention relates to a technology for recovering washing mother liquid containing magnesium sulfate. The technology comprises the following steps: using the washing mother liquid of the magnesium sulfate in the technology of producing potassium chloride in a brining method, mixing the washing mother liquid and salt manufacturing mother liquid to obtain mixed liquid, brining the mixed liquid and potassium manufacturing mother liquid, controlling magnesium chloride / potassium chloride to be greater than or equal to 10.5 and magnesium sulfate / magnesium chloride to be smaller than or equal to 0.35 in a brining process, obtaining mixed brine, and performing high-temperature evaporation and separation on the mixed brine to obtain mixed salt and evaporated mother liquid; brining the evaporated mother liquid, part of potassium manufacturing mother liquid in a potassium chloride producing technology in a brining method, and mixed liquid in a next circulating technology to obtain mixed brine for continuing the circulating technology, separating the mixed salt through sodium chloride and a magnesium sulfate monohydrate separation system to obtain solid sodium chloride, magnesium sulfate monohydrate and the washing mother liquid containing the magnesium sulfate, mixing the solid sodium chloride, the magnesium sulfate monohydrate, the washing mother liquid containing the magnesium sulfate and the salt manufacturing mother liquid in the next cycle to obtain mixed liquid, and continuing the circulating technology. Waste liquid is not discharged in the process of the technology, and the technology has the characteristics of refined technological process, high recovery rate of the washing mother liquid, zero discharge of three wastes and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt recovery, in particular to a process for separating washing mother liquor containing magnesium sulfate in the production of potassium chloride by adding brine. Background technique [0002] The known by-product mixed salt washing mother liquor (containing salt, magnesium sulfate, potassium chloride, magnesium chloride) in the process of producing potassium chloride by the known brine method generally adopts the method of direct discharge, and is discharged to the external environment, wherein the salt, magnesium sulfate , Potassium Chloride, and Magnesium Chloride are not recovered, and the yields of inorganic salts such as Potassium Chloride and Magnesium Sulfate are low, which increases the production of Potassium Chloride raw materials and energy consumption, increases production costs, and causes great pollution to the environment. Therefore, the economical efficiency of the current pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01F5/40
Inventor 彭赛军
Owner CHINA LIGHT IND INT ENG CO LTD