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Process of preparing potassium sulfate with potassium containing bittern of magnesium sulfate subtype

A magnesium sulfate subtype, potassium sulfate technology, applied in the direction of alkali metal sulfite/sulfite, bisulfite preparation, chemical instruments and methods, etc., can solve the problems of high energy consumption, complicated process, long process, etc. Achieve the effect of high yield, simple process and high production efficiency

Inactive Publication Date: 2007-11-07
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

The process of this scheme is complicated, the process is long, and the energy consumption is high due to the large amount of brine

Method used

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  • Process of preparing potassium sulfate with potassium containing bittern of magnesium sulfate subtype

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Embodiment Construction

[0020] ①Put potassium-containing magnesium sulfate subtype raw brine into sodium chloride salt fields and evaporate in the sun to precipitate most of the sodium chloride. The salt pool continues to evaporate and separate out one section of potassium-containing sulfate; when the first section of sulfate is precipitated to a certain degree (determined according to the phase diagram calculation result), this brine is poured into the second section of sulfate pool to continue to separate out the second section of potassium-containing sulfate to obtain potassium-containing sulfate. The main sulfate mine. When the second section of sulfate brine is evaporated to the saturation of carnallite, pour the brine into a section of carnallite evaporation pool to evaporate, and when the precipitation of carnallite in the carnallite pool reaches about 80% of the calculated amount, the Pour into the second-stage carnallite pool and continue to evaporate until the magnesium chloride is saturate...

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Abstract

The present invention provides process of preparing potassium sulfate with potassium containing subtype magnesium sulfate bittern. The process includes naturally evaporating potassium containing subtype magnesium sulfate bittern from salt lake to crystallize and separate out potassium containing sulfate and sulfate radical containing carnallite successively; grinding the potassium containing sulfate, decomposing to convert and floating to obtain picromerite; decomposing sulfate radical containing carnallite to convert and floating to obtain coarse potassium chloride; mixing picromerite, coarse potassium chloride and potassium sulfate mother liquid to obtain slurry, washing, filtering, decomposing to convert and filtering separation to obtain potassium sulfate. The present invention has low production cost, high yield and high product quality.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a crossover technology of flotation separation and inorganic salt phase chemical separation, in particular to a method of combining flotation separation method and inorganic salt phase chemical technology, using magnesium sulfate subtype potassium-containing brine as the A method for preparing potassium sulfate from raw materials. Background technique [0002] Potassium fertilizer is a non-renewable scarce resource. Potassium fertilizer is also one of the main fertilizers in agricultural production, especially for stalk crops. It has a strong stalk effect. Once it is lacking, it will cause lodging and reduce production. Potassium fertilizer is also one of the three major raw materials for the production of compound fertilizers. , The price of potash fertilizer has a great impact on the price of chemical fertilizer. The safety of potash fertilizer is related to the safety ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D5/12
Inventor 李海民张全有陈育刚孟瑞英杨海芸
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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