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Potassium perchlorate production method and recycling method of sodium chloride mother liquid

A technology of potassium perchlorate and recovery method, applied in the direction of perchloric acid, perchlorate, alkali metal halide purification, etc., can solve the problems of short circuit of electrode plates of electrolytic cells, burning electrolytic cells, etc., to reduce production and operation costs, increase Yield, the effect of improving the quality of recycling

Active Publication Date: 2017-05-31
浏阳市化工厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Because in the sodium chloride electrolysis system, there is a large amount of chlorate ClO 3- Exist, at this time, potassium ion K + will react with chlorate ClO 3- It crystallizes out in the form of potassium chloride, causing a short circuit on the plate of the electrolytic cell, and even burning the electrolytic cell in serious cases.

Method used

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  • Potassium perchlorate production method and recycling method of sodium chloride mother liquid
  • Potassium perchlorate production method and recycling method of sodium chloride mother liquid
  • Potassium perchlorate production method and recycling method of sodium chloride mother liquid

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Embodiment 1

[0045] The concentration of sodium perchlorate is set to be 850g / L, the volume is 1L, the concentration of potassium chloride is 290g / L, and the potassium chloride 517g can be calculated by mass balance, and the volume is 1.78L. The total volume before reaction is 1+1.78=2.78L.

[0046] Potassium perchlorate quality is 961g, and solid phase volume is 961 / 2.53 (potassium perchlorate density)=380ml, so the volume of sodium chloride mother liquor is 2.78-0.38=2.4L. Sodium chloride quality is 405.9g, then the mass concentration of sodium chloride mother liquor is 405.9 / 2.4=169g / L. From the above data and the solubility of potassium perchlorate, it can be calculated that the concentration of dissolved potassium perchlorate in the mother liquor (the first mother liquor) when the temperature is 40° C. is 34.1 g / L. Potassium ion content is 34.1 * 39 / 138.5=9.6g / L, is far greater than the potassium ion content (4g / L) that mother liquor recovery requires, so mother liquor can't reclaim ...

Embodiment 2

[0052] Table 1 Production experiment data table

[0053]

[0054]

[0055] As can be seen from Table 1, when the sodium chloride mother liquor is obtained after the deep freezing step, the potassium ion content is lower than the standard of 4g / L for four samplings, and can return to the electrolytic solution to participate in the production of potassium perchlorate again. Production.

[0056] In the process of producing potassium perchlorate, the loss of raw sodium chloride salt is 0.45 tons per ton of potassium perchlorate. The annual production of 20,000 tons of potassium perchlorate requires 9,000 tons of raw salt. Recycling all the waste mother liquor can save 8,400 tons of raw salt and raw materials. The cost is 3.78 million yuan (calculated at the price of raw salt 450 yuan / ton).

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Abstract

The invention discloses a recycling method of sodium chloride mother liquid in a potassium perchlorate production process. The method comprises the following steps: cooling a mixture of potassium perchlorate and sodium chloride to 40 DEG C; performing air cooling of the mixture; performing centrifugal separation of the mixture after the air cooling to obtain a potassium perchlorate product and a first mother liquid; evaporating the first mother liquid to obtain a second mother liquid; performing primary cooling, secondary cooling and centrifugal separation of the second mother liquid respectively to obtain a third mother liquid; and performing deep freezing and centrifugal separation of the third mother liquid to obtain a potassium perchlorate crystal and a fourth mother liquid. In the method, the content of potassium ions in the sodium chloride mother liquid can be reduced to be or below 4 g / L, and the resources are fully utilized to avoid waste and pollution.

Description

technical field [0001] The invention relates to the technical field of potassium perchlorate production, in particular to a closed-circuit combined production method of potassium perchlorate and a method for recycling sodium chloride mother liquor produced in the production process. Background technique [0002] Potassium perchlorate is mainly used in the production of firecrackers and fireworks. my country is a big producer of traditional firecrackers and fireworks, so the production of potassium perchlorate is relatively large. [0003] The production method of potassium perchlorate is numerous, but adopts two kinds of methods mostly at present, and one is to produce potassium perchlorate with potassium chloride as raw material, and this method accounts for 90%. It is mainly sodium chloride, and sodium chlorate can be produced after the mother liquor is recovered and treated. Another method is to use potassium chlorate as raw material to produce potassium perchlorate, wh...

Claims

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Application Information

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IPC IPC(8): C01B11/18C01D3/14C25B1/26
CPCC01B11/18C01D3/14C25B1/265
Inventor 陈国清王金宏
Owner 浏阳市化工厂有限公司
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