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Recovery method for potassium chloride from waste tail liquid by carnallite flotation process

A recovery method, potassium chloride technology, applied in chemical instruments and methods, alkali metal chloride, water/sewage treatment, etc., can solve the problems of large investment in plant construction and low recovery rate, and achieve no environmental pollution and high recovery rate High, uniform effect

Inactive Publication Date: 2006-09-13
魏君英
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Problems solved by technology

[0003] In order to overcome the problems in the prior art that a large amount of tail liquid is discarded and the brine method has large investment in plant construction and low recovery rate, the present invention proposes a method that utilizes waste tail liquid, does not pollute the environment, has high recovery rate, and low production cost. The recovery method of potassium chloride in the waste tail liquid of the carnallite flotation method

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  • Recovery method for potassium chloride from waste tail liquid by carnallite flotation process

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Embodiment 1

[0022] Take by weighing 1260kg of tail salt water with a concentration of 27Be for pre-drying. When drying to 29Be, separate sodium chloride to obtain 1008kg of solution 1, and tanning solution 1 to 31.3Be to obtain 736kg of solution 2, and then pass through solution 2 at -10 Freeze below ℃ to obtain 86.3 kg of crude potassium chloride with a potassium chloride content of 47 wt%, and then dissolve the crude potassium chloride in water, spread the sun, evaporate, and crystallize to obtain 18.8 kg of 90 wt% crystalline potassium chloride.

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Abstract

The present invention belongs to the field of alkali metal halide producing technology, and aims at recovering tail liquid in low cost and high recovering rate. The process of recovering potassium chloride from waste tail liquid of carnallite flotation process includes the steps of sunning tail salt solution, spreading to sun, storing, cooling to separate, dissolving coarse potassium chloride and crystallization, and refining potassium chloride crystal. The present invention has the advantages of utilizing waste tail liquid, no environmental pollution, high recovering rate, low production cost, etc.

Description

technical field [0001] The invention relates to the technical field of alkali metal halides, in particular to a preparation method of potassium chloride. Background technique [0002] Potassium chloride is the main variety of agricultural potassium fertilizer, and it is also the main raw material for industrial production of other potassium salts. At present, 70% of the potassium chloride production enterprises in our country are still using the traditional carnallite flotation process. When this process produces 1 ton of potassium chloride, about 8 tons of waste water must be discharged, and the normal output of 30,000 tons of potassium chloride must be discharged. 240,000 tons of wastewater, only a small number of enterprises use the brine method to spread the wastewater to points E and F in the phase diagram, and use the brine at points E and F to mix brine in the brine device to precipitate low-sodium carnallite , the low-sodium carnallite is washed and dried twice to o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04C01D3/06C02F1/00
Inventor 高崧耀魏君英
Owner 魏君英