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Method of producing neutral high quality anhydrous sodium sulfate using natucal salt lake sodium sulfate decahydrate

A technology of sodium sodium sulfate and sodium sulfate, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal sulfite/sulfate purification, etc., can solve the problems of sodium sulfate purity, whiteness, Alkali content is not ideal enough to achieve the effect of increasing technological added value, easy control, and improving purity

Inactive Publication Date: 2004-02-18
INNER MONGOLIA YUANXING ENERGY
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Problems solved by technology

The purity, whiteness and alkali content produced by this method are not ideal enough

Method used

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  • Method of producing neutral high quality anhydrous sodium sulfate using natucal salt lake sodium sulfate decahydrate
  • Method of producing neutral high quality anhydrous sodium sulfate using natucal salt lake sodium sulfate decahydrate

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Embodiment

[0007] Embodiment: (see figure)

[0008] Glauber's salt resources in salt lakes (resources are saline-alkali nitrate symbiotic mines), crystalline nitrate produced through cold and hot brine making process and nitrate sun drying process as raw materials, in which the content of sodium sulfate is more than 40%, and the content of sodium chloride is 8-12% %, the sodium carbonate content is 5-10%; dissolving sodium Glauber's salt in water, so that the concentration of the clear solution is 250-350 grams per liter; let the clear solution pass through the sand bed to filter and refine, so that the turbidity of the filtered clear solution is less than 10ppm, wherein the thickness of the sand bed is 0.6-0.7 meters, and the diameter of the sand grains is 0.45-0.6 millimeters; add ammonium sulfate to reduce alkali and neutralize in the filtered nitric acid solution: , the add-on of ammonium sulfate is 80-90% that contains sodium carbonate total amount in the clear nitric liquid; E...

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Abstract

A process for preparing the refined neutral sodium sulphate from the sodium mirabilite of natural salt lake includes dissolving raw material, sand filtering, adding ammonium sulfate, forced evaporation, centrifugal separation, hot-air drying and magnetically removing iron. Its advantages are high purity (more than 99.3%), high whiteness (90%) and pH value 6-8.

Description

Technical field: [0001] The invention discloses a method for producing neutral high-quality sodium sulfate from natural salt lake sodium mirabilite, which belongs to the field of chemical industry. Background technique: [0002] Industrial anhydrous sodium sulfate was invented by Glauber in France in 1658. With the advancement of science and technology, anhydrous sodium sulfate with high purity was gradually produced. Later generations called high-purity anhydrous sodium sulfate as Yuanming powder. . At present, the production scale of Yuanming powder in my country ranks first in the world. There are three kinds of raw materials for the production of salt lake sodium sulfate, sea salt salt, and sodium sulfate ore. The production methods mainly include by-product method, conversion method, weathering and drying method, thermal dissolution and salt precipitation method, fire tower evaporation method, and total thermal melting evaporation method. seven kinds. Among them, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D5/16C01D5/18
Inventor 刘忠易赵国智赵云张培文贺学良
Owner INNER MONGOLIA YUANXING ENERGY
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