Recovery method of magnesium sulfate monohydrate washing liquid

A recovery method, magnesium sulfate technology, applied in the direction of magnesium sulfate, alkali metal chloride, etc., can solve problems such as environmental pollution and waste of resources, and achieve the effects of reducing costs, increasing total volume, and reducing waste liquid discharge

Active Publication Date: 2017-01-04
金达行有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the technical problem to be solved by this application is that the magnesium sulfate monohydrate washing liquid is directly discharged in the existing process, which wastes resources on the one hand and causes environmental pollution on the other hand

Method used

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  • Recovery method of magnesium sulfate monohydrate washing liquid

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Effect test

Embodiment 1

[0034] Such as figure 1 Shown, a kind of method that produces potassium chloride, sodium chloride, magnesium sulfate monohydrate with salt mother liquor, uses the recovery method of magnesium sulfate monohydrate washing liquid, comprises the following steps:

[0035] (1) prepare the salt-making mother liquor in the Potassium Chloride technique and obtain evaporation completion liquid after evaporation and concentration;

[0036] (2) Evaporation is completed and the liquid is subjected to heat preservation and settlement to obtain clarified liquid and high-temperature salt slurry; the obtained clarified liquid is produced to produce potassium chloride product;

[0037] (3) After the high-temperature salt slurry is mixed with a part of the magnesium sulfate monohydrate washing solution obtained in step (5), the solid-liquid separation is carried out for the first time to obtain the first liquid phase and the first solid phase. The first liquid phase is the mixed liquid, and the...

Embodiment 2

[0044] Such as figure 1 Shown, a kind of method that produces potassium chloride, sodium chloride, magnesium sulfate monohydrate with salt-making mother liquor, uses the recovery method of magnesium sulfate monohydrate washing liquid, and its step other is identical with embodiment 1, and difference is: In the present embodiment, in step (3), the volume ratio of the mixed high-temperature salt slurry and magnesium sulfate monohydrate washing liquid is 1:0.5; the solid-liquid separation in steps (3), (4) is centrifugal separation, and step ( 5) The solid-liquid separation in is normal pressure filtration.

[0045] In the present embodiment, adopt the method provided by the invention, the total amount of potassium chloride, sodium chloride and magnesium sulfate monohydrate product that obtains increases 5.3% (weight) than original technology.

Embodiment 3

[0047] Such as figure 1 Shown, a kind of method that produces potassium chloride, sodium chloride, magnesium sulfate monohydrate with salt-making mother liquor, uses the recovery method of magnesium sulfate monohydrate washing liquid, and its step other is identical with embodiment 1, and difference is: In the present embodiment, in step (3), the volume ratio of the mixed high-temperature salt slurry and magnesium sulfate monohydrate washing liquid is 1:0.8; the solid-liquid separation in step (3) is normal pressure filtration, and in step (4) The solid-liquid separation is standing at normal temperature, and the solid-liquid separation in step (5) is centrifugation.

[0048] In the present embodiment, adopt the method provided by the invention, the total amount of potassium chloride, sodium chloride and magnesium sulfate monohydrate product that obtains increases 6.1% (weight) than original technology.

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Abstract

The application discloses a method for preparing potassium chloride, sodium chloride and magnesium sulfate monohydrate from salt-making mother liquor and a recovery method of a magnesium sulfate monohydrate washing liquid, and belongs to the technical field of salt making by bittern and comprehensive utilization of sea water desalination by-product concentrated seawater. The recovery method of the magnesium sulfate monohydrate washing liquid comprises the following steps: a part of the magnesium sulfate monohydrate washing liquid in the magnesium sulfate monohydrate washing liquid preparation technology is mixed with high temperature salt slurry in the potassium chloride preparation technology; solid-liquid separation is carried out; and finally, a liquid phase returns to the potassium chloride preparation technology. In the recovery method of the magnesium sulfate monohydrate washing liquid, according to the principle of common-ion effect, the magnesium sulfate monohydrate washing liquid is mixed with the high temperature salt slurry, and the liquid phase obtained after the solid-liquid separation returns to an evaporation process in the potassium chloride preparation technology. By the method, smooth operation of the evaporation process is guaranteed, a solid phase obtained is used for preparation of sodium chloride and magnesium sulfate monohydrate products, and the magnesium sulfate monohydrate washing liquid is recycled.

Description

technical field [0001] This application belongs to the field of comprehensive utilization of brine salt production and seawater desalination by-product concentrated seawater, specifically, it relates to a method for preparing potassium chloride, sodium chloride and magnesium sulfate monohydrate from salt production mother liquor, and the method used The recovery method of magnesium sulfate monohydrate washing solution. Background technique [0002] Seawater desalination is the use of seawater desalination to produce fresh water. It is an open-source incremental technology to realize the utilization of water resources. It can increase the total amount of fresh water and is not affected by time, space and climate. Seawater desalination produces concentrated seawater (concentration of about 5°Bé to 12°Bé) while producing fresh water, and its salt content is 1 to 3 times higher than that of seawater. The sodium chloride product in the concentrated seawater can be extracted by h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01F5/40
Inventor 韦相亮马崇维盖理·波德拉伯斯基
Owner 金达行有限公司
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