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Sodium sulfate and sodium chloride salt separation method

A technology of sodium chloride and sodium sulfate, applied in alkali metal sulfite/sulfate purification, alkali metal chloride, alkali metal halide purification, etc., can solve the problem of extraction efficiency and purity that are not suitable for large-scale extraction Low, complex extraction and separation problems, to achieve the effect of reasonable evaporation end point concentration, clear thinking, and strong adaptability of raw materials

Pending Publication Date: 2021-04-27
JIANGSU SAIDELI PHARMA MACHINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In saline wastewater, it often contains a large amount of sodium sulfate and sodium chloride, but in the prior art, the extraction and separation of the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of sodium sulfate, sodium chloride salt dividing method, comprises the steps:

[0027] S1. Transport the saline wastewater from the feed pump to the distilled water preheater and raw steam preheater successively. After preheating with the distilled water and raw steam in the evaporation crystallization system to the set temperature, it is directly injected into the forced circulation part of the MVR, and continues evaporative crystallization;

[0028] S2. The 90°C secondary steam coming out from the top of the crystallization separator enters the liquid foam separator and enters the MVR compression system after liquid foam separation by the swirl plate demister;

[0029] S3. The compressed steam is injected into the evaporation chamber to heat the material. During the process of heating the material, this part of the 100°C steam condenses into water and is discharged by the distilled water pump. The distilled water plate heat exchanger exchanges heat with the raw...

Embodiment 2

[0036] A kind of sodium sulfate, sodium chloride salt dividing method, comprises the steps:

[0037] S1. Transport the saline wastewater from the feed pump to the distilled water preheater and raw steam preheater successively. After preheating with the distilled water and raw steam in the evaporation crystallization system to the set temperature, it is directly injected into the forced circulation part of the MVR, and continues evaporative crystallization;

[0038] S2. The 90°C secondary steam coming out from the top of the crystallization separator enters the liquid foam separator and enters the MVR compression system after liquid foam separation by the swirl plate demister;

[0039] S3. The compressed steam is injected into the evaporation chamber to heat the material. During the process of heating the material, this part of the 100°C steam condenses into water and is discharged by the distilled water pump. The distilled water plate heat exchanger exchanges heat with the raw...

Embodiment 3

[0046] A kind of sodium sulfate, sodium chloride salt dividing method, comprises the steps:

[0047] S1. Transport the saline wastewater from the feed pump to the distilled water preheater and raw steam preheater successively. After preheating with the distilled water and raw steam in the evaporation crystallization system to the set temperature, it is directly injected into the forced circulation part of the MVR, and continues evaporative crystallization;

[0048] S2. The 90°C secondary steam coming out from the top of the crystallization separator enters the liquid foam separator and enters the MVR compression system after liquid foam separation by the swirl plate demister;

[0049] S3. The compressed steam is injected into the evaporation chamber to heat the material. During the process of heating the material, this part of the 100°C steam condenses into water and is discharged by the distilled water pump. The distilled water plate heat exchanger exchanges heat with the raw...

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Abstract

The invention provides a sodium sulfate and sodium chloride salt separation method, and relates to the technical field of salt separation, and the method comprises the following steps: S1, sequentially conveying salt-containing wastewater to a distilled water pre-heater and a live steam pre-heater from a feeding pump, and then pumping the wastewater into an MVR forced circulation part; S2, entering a liquid-foam separator, and carrying out liquid-foam separation through a rotational flow plate demister; S3, pumping the compressed steam into an evaporation chamber to heat the materials, and then discharging from an MVR evaporative crystallization system; and S4, after the preheated material enters an evaporator, carrying out heat exchange on the preheated materials and compressed secondary steam which is heated to about 108 DEG C. By arranging a distilled water pre-heater and a live steam pre-heater, salt-containing wastewater and distilled water and live steam of an evaporative crystallization system can be heated to a set temperature, by arranging a liquid-foam separator, liquid-foam separation can be conducted on mixed liquid, the purity of separated salt is improved, operation of the whole system can be completed through a computer, and the method has the advantages of being high in raw material adaptability, high in evaporation efficiency, environmentally friendly and green in process and the like.

Description

technical field [0001] The invention relates to the technical field of salt separation, in particular to a sodium sulfate and sodium chloride salt separation method. Background technique [0002] Sodium sulfate, inorganic compound, white, odorless, bitter crystal or powder, hygroscopic. Appearance is colorless, transparent, large crystals or granular small crystals. It is mainly used in the production of sodium silicate, glass, enamel, pulp, refrigeration mixture, detergent, desiccant, dye thinner, analytical chemical reagents, pharmaceuticals, etc. [0003] Sodium chloride, the appearance is white crystal, its source is mainly in seawater, and it is the main component of table salt. Soluble in water and glycerin, slightly soluble in ethanol and liquid ammonia; insoluble in concentrated hydrochloric acid. It is slightly deliquescent in the air. The stability is relatively good. It is used in the manufacture of soda ash, caustic soda and other chemical products in industr...

Claims

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Application Information

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IPC IPC(8): C01D5/16C01D3/14C01D3/04
CPCC01D5/16C01D3/14C01D3/04C01P2006/80
Inventor 顾逸顾根生徐建武沈劲松徐康明章龙妹刘晖
Owner JIANGSU SAIDELI PHARMA MACHINE
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