A kind of recovery and utilization method of carnallite liquid in the production of potassium chloride

A carnallite, potassium chloride technology, applied in the directions of alkali metal chloride, bromine/hydrogen bromide, magnesium sulfate, etc., can solve the problem of affecting the quality of carnallite products, affecting the production of potassium chloride products, carnallite NaCl The problems such as the increase of the content, to achieve the effect of easy industrialization, reduction of the content, and low degree of transformation

Inactive Publication Date: 2016-03-02
天津长芦汉沽盐场有限责任公司
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Problems solved by technology

Because the content of sodium chloride in the liquid after carnallite is high, long-term cyclic settlement will inevitably lead to the increase of NaCl content in carnallite, which will affect the quality of carnallite products, and then affect the production of potassium chloride products

Method used

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  • A kind of recovery and utilization method of carnallite liquid in the production of potassium chloride
  • A kind of recovery and utilization method of carnallite liquid in the production of potassium chloride
  • A kind of recovery and utilization method of carnallite liquid in the production of potassium chloride

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Embodiment Construction

[0019] In order to further understand the invention content, characteristics and effects of the present invention, the following embodiments are enumerated hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0020] A kind of recycling method of liquid after carnallite throws off in the production of potassium chloride, specifically operates according to the following steps:

[0021] After the bittern is mixed with bittern, evaporated, heat-preserved and settled, the overflow clarified liquid enters the cooling crystallization process to obtain carnallite slurry, which is transported to the carnallite settler for settlement. The carnallite obtained from the carnallite settler is buffered by the carnallite buffer tank and sent to the centrifuge for separation. The separated solid enters the carnallite tank for stirring and washing, then is sent to the speed-controlled crystallizer for decomposition, and then enters the washing, Dehyd...

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Abstract

The invention discloses a recycling method for a carnallite post-throwing liquid in production of potassium chloride. The recycling method comprises the following steps: after separating carnallite which is settled by a carnalite settler by a centrifugal machine, washing the solid in a trough and conveying the solid to a speed control crystallizer; buffering the post-throwing liquid by virtue of a post-throwing liquid tank, conveying the post-throwing liquid to a post-throwing liquid settler and conveying a salt slurry which is settled by the post-throwing liquid settler to a high-temperature salt dosing step for production of industrial refined salt and magnesium sulfate monohydrate; and conveying an overflowing liquid in the upper layer by using the post-throwing liquid settler and the carnalite settler to an industrial bromine production step for production of industrial bromine. According to the method disclosed by the invention, the quality of a carnallite product in production of potassium chloride is improved, so that the content of potassium chloride in the carnallite product is reduced, the water consumption in a decomposing and washing step is reduced, the washing yield of potassium chloride is improved, the loss of potassium chloride in the washing process is avoided, and meanwhile, the potassium chloride product is improved, so that the targets of improving the quality and reducing the consumption are achieved.

Description

[0001] Field: [0002] The invention relates to a production method of potassium chloride, in particular to a method for recycling carnallite after-slipped liquid in the production of potassium chloride. Background technique: [0003] Carnallite, whose molecular formula is KCl MgCl 2 ·6H 2 O, the molecular weight is 277.87. Produced as colorless orthorhombic granular or dense aggregates, crystals are rare. The relative density is 1.6. It is widely used in the manufacture of potash fertilizers and mineral raw materials for extracting magnesium metal. It is mainly used as a refining agent for refining magnesium and as a protective agent for producing aluminum-magnesium alloys. It is also used as a welding agent for aluminum-magnesium alloys, as a flux for metals, and as a raw material for the production of potassium and magnesium salts. [0004] At present, the extraction of potassium chloride from potassium-containing brine at home and abroad, whether it is cold decomposi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04C01F5/40C01B7/09
Inventor 吴宗生王景波徐作春张子山刘瀚阳
Owner 天津长芦汉沽盐场有限责任公司
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