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Method for respectively crystallizing and separating sodium chloride and potassium chloride in industrial wastewater with sodium chloride and potassium chloride

A technology for separation of industrial wastewater and crystallization, applied in the direction of alkali metal chloride, etc., can solve the problems of low crystal yield, poor economic benefit, and low purity.

Inactive Publication Date: 2012-07-18
BEIJING PUREN MEIHUA ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adopt above-mentioned method to only be able to reclaim about 10% potassium chloride crystals in the industrial wastewater, the purity is not high, the amount of crystals is too low, and the economic benefit is poor

Method used

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  • Method for respectively crystallizing and separating sodium chloride and potassium chloride in industrial wastewater with sodium chloride and potassium chloride
  • Method for respectively crystallizing and separating sodium chloride and potassium chloride in industrial wastewater with sodium chloride and potassium chloride
  • Method for respectively crystallizing and separating sodium chloride and potassium chloride in industrial wastewater with sodium chloride and potassium chloride

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1 (the situation that does not add ethanol)

[0035] Adopt pretreated industrial waste water (mass concentration is 3% sodium chloride and potassium chloride mixed solution, wherein the mass ratio of sodium chloride and potassium chloride is 7: 3) 3L, it is evaporated at 101 ℃ Concentrate, and when the evaporated water is 2.914L, potassium chloride reaches saturation. At this time, 41g of sodium chloride crystals are separated out, and the concentrated liquid obtained is 86ml, which contains 27g of potassium chloride and 22g of sodium chloride.

[0036] The obtained concentrated liquid, i.e. the saturated solution of potassium chloride, was cooled to 30° C. and left to stand for a period of time. Crystals were separated and separated. The crystals were 3.187 g, including 0.347 g of sodium chloride and 2.84 g of potassium chloride.

Embodiment 2

[0037] Embodiment 2 (agent water ratio is the situation of 30%)

[0038] Adopt pretreated industrial waste water (mass concentration is 3% sodium chloride and potassium chloride mixed solution, wherein the mass ratio of sodium chloride and potassium chloride is 7: 3) 3L, it is evaporated at 101 ℃ Concentrate, and when the evaporated water is 2.914L, potassium chloride reaches saturation. At this time, 41g of sodium chloride crystals are separated out, and the concentrated liquid obtained is 86ml, which contains 27g of potassium chloride and 22g of sodium chloride.

[0039] The obtained concentrated liquid, i.e. the saturated solution of Potassium Chloride, is cooled to 30°C, and 14ml of dehydrated alcohol is added, (agent-to-water ratio W=30%, the ratio of dehydrated alcohol to water is the quality of dehydrated alcohol and the quality of water in the concentrated liquid ratio), preferably, the mixed solution can be stirred evenly with a glass rod to help mix. At 30°C, after ...

Embodiment 3

[0040] Embodiment 3 (agent water ratio is the situation of 50%)

[0041] Adopt pretreated industrial waste water (mass concentration is 3% sodium chloride and potassium chloride mixed solution, wherein the mass ratio of sodium chloride and potassium chloride is 7: 3) 3L, it is evaporated at 101 ℃ Concentrate, and when the evaporated water is 2.914L, potassium chloride reaches saturation. At this time, 41g of sodium chloride crystals are separated out, and the concentrated liquid obtained is 86ml, which contains 27g of potassium chloride and 22g of sodium chloride.

[0042] The obtained concentrated liquid, i.e. the saturated solution of potassium chloride, is cooled down to 30°C, and 23ml of dehydrated alcohol is added, (agent-water ratio W=50%), preferably, the mixed solution can be stirred evenly with a glass rod to help The role of mixing. At 30°C, after standing for a period of time, crystals were separated, and the crystals were 19.91g, including 1.80g of sodium chloride...

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Abstract

The invention provides a method for respectively crystallizing and separating sodium chloride and potassium chloride in industrial wastewater with the sodium chloride and the potassium chloride. The method comprises the following steps of: (1) evaporating and concentrating the industrial wastewater with the sodium chloride and the potassium chloride until the potassium chloride in the industrial wastewater is in a saturated and dissolved state, and separating out sodium chloride crystals; (2) cooling concentrated liquid obtained in the step (1); and (3) adding organic solvents which can be codissolved with water into the concentrated liquid cooled in the step (2), and separating out potassium chloride crystals. According to the method, the sodium chloride is separated from the potassium chloride in a crystallization manner, the high-purity sodium chloride and potassium chloride can be obtained by adding the organic solvents, and the crystal yield is improved by five times compared with that of the prior art.

Description

technical field [0001] The invention belongs to the technical field of industrial waste water treatment, in particular to a method for separately crystallizing and separating sodium chloride and potassium chloride in industrial waste water containing both sodium chloride and potassium chloride. Background technique [0002] Along with industrial production, a large amount of industrial wastewater is produced every day, especially some high-salt industrial wastewater. The ideal situation is to extract certain valuable sodium salt and potassium salt from high-salt industrial wastewater, recycle and sell, and turn waste into precious. In the prior art, through pretreatment of high-salt industrial wastewater, impurities and heavy metals in high-salt industrial wastewater can already be removed to obtain industrial wastewater containing only sodium chloride and potassium chloride. According to the solubility characteristics of potassium chloride in water, sodium chloride and pot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04
Inventor 陈丁人朱佳飞杨瑞凤
Owner BEIJING PUREN MEIHUA ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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