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Method for treating sodium chloride-containing carnallite and device thereof

A treatment method and a treatment device technology, applied in the direction of alkali metal chloride, alkali metal sulfite/sulfate dehydration, etc.

Pending Publication Date: 2020-06-05
SHANGHAI JINGYU ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, it is seldom involved in how to separate and recover high-purity sodium chloride from miscellaneous salts mainly composed of sodium chloride, and reduce energy consumption in the recovery process and reduce waste salt discharge.

Method used

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  • Method for treating sodium chloride-containing carnallite and device thereof
  • Method for treating sodium chloride-containing carnallite and device thereof
  • Method for treating sodium chloride-containing carnallite and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Pyrolyze the miscellaneous salt at 400-650°C; after dissolving the miscellaneous salt, remove the carbonized organic matter and suspended matter in the miscellaneous salt solution by filtration;

[0076] Adding alkali, soda ash, coagulant and coagulant aid, and then removing the precipitate in the miscellaneous salt solution;

[0077] Further remove calcium, magnesium, silicon and heavy metal ions through ion adsorption system;

[0078] Dissolve the miscellaneous salt at 25-50°C, control the concentration of sodium chloride in the miscellaneous salt solution to 200g / L, and the concentration ratio of sodium chloride to sodium sulfate in the miscellaneous salt solution is 12:1;

[0079] Evaporate and crystallize the miscellaneous salt solution to obtain sodium chloride crystals and the first evaporated mother liquor, and control the evaporation temperature at 60-80°C;

[0080] Then freeze and crystallize the first evaporated mother liquor to obtain Glauber's salt and the f...

Embodiment 2

[0085] Pyrolyze the miscellaneous salt at 400-650°C; after dissolving the miscellaneous salt, remove the carbonized organic matter and suspended matter in the miscellaneous salt solution by filtration;

[0086] Adding alkali, soda ash, coagulant and coagulant aid, and then removing the precipitate in the miscellaneous salt solution;

[0087] Further remove calcium, magnesium, silicon and heavy metal ions through ion adsorption system;

[0088] Dissolve the miscellaneous salt at 25-50°C, control the concentration of sodium chloride in the miscellaneous salt solution to 200g / L, and the concentration ratio of sodium chloride and sodium sulfate in the miscellaneous salt solution is less than 5:1;

[0089] Glauber's salt is crystallized by evaporation to obtain anhydrous sodium sulfate;

[0090] Freezing and crystallizing the miscellaneous salt solution to obtain Glauber's salt and the second frozen mother liquor; then evaporating and crystallizing the second frozen mother liquor ...

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Abstract

The invention discloses a treatment method and device for sodium chloride-containing carnallite, and the method comprises the following steps: dissolving the carnallite, and controlling the concentration of sodium chloride in a carnallite solution to be 150-250g / L; when the concentration ratio of sodium chloride to sodium sulfate in the miscellaneous salt solution is greater than or equal to 10: 1, evaporating and crystallizing the miscellaneous salt solution to obtain sodium chloride crystals and a first evaporation mother solution; freezing and crystallizing the first evaporation mother liquor to obtain mirabilite and first frozen mother liquor; when the concentration ratio of sodium chloride to sodium sulfate in the miscellaneous salt solution is less than 10: 1, freezing and crystallizing the miscellaneous salt solution to obtain mirabilite and second frozen mother liquor; and evaporating and crystallizing the second frozen mother liquor to obtain sodium chloride crystals and second evaporated mother liquor. By controlling the concentration of sodium chloride to be 150-250g / L and selecting different treatment methods according to different proportions of sodium chloride and sodium sulfate in the carnallite solution, the purity of the recovered sodium chloride and sodium sulfate can be ensured, the energy consumption of the whole treatment process is reduced, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of miscellaneous salt treatment, in particular to a treatment method and device for miscellaneous salt containing sodium chloride. Background technique [0002] In recent years, with the rapid development of my country's economy, the amount of waste salt produced in the waste water treatment process of domestic and foreign power petrochemical and coal chemical industries has also shown an increasing trend. At present, the annual output of waste salt exceeds 20 million tons, which has been qualitatively As hazardous waste, the national environmental protection department requires strict control. Undisposed waste salt is easy to be leached, which can directly affect surface water and groundwater pollution, damage the surrounding ecological environment, lead to soil salinization and endanger human health. Therefore, whether the waste salt can be properly treated and utilized has become a key part of the zero discharge of...

Claims

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Application Information

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IPC IPC(8): C01D3/06C01D5/18
CPCC01D3/06C01D5/18C01P2006/80
Inventor 夏俊方李鹏飞方小琴张水水周耀水陆魁肖龙博
Owner SHANGHAI JINGYU ENVIRONMENT ENG