Potassium perchlorate effluent brine treatment apparatus, and technology for recovering potassium perchlorate and sodium chloride from potassium perchlorate effluent brine

A technology of potassium perchlorate and waste brine, applied in the direction of perchlorate, perchloric acid, multi-stage water treatment, etc., can solve the problems of high impurity content of sodium chloride, long-term environmental pollution, and insignificant economic benefits, etc., to achieve High purity, sufficient separation and recovery, and low power consumption

Active Publication Date: 2016-10-12
湖南傲创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing potassium perchlorate production process will produce a large amount of potassium perchlorate waste brine, and the recovery process for this potassium perchlorate waste brine is not perfect at present, or the economic benefits brought to the investment are not significant, thus inevitably bringing environmental problems. This has drawn great attention from industry insiders
In order to avoid the discharge of potassium perchlorate waste brine, some manufacturers have used evaporators to evaporate the waste water, because the evaporated water is too much (production of 1 ton of potassium perchlorate 3m 3 waste water), the sodium chloride impurity content obtained by evaporation is too high, has no economic value, and energy consumption is high again, and abandons
Potassium perchlorate waste brine contains chlorate, perchlorate and other small amounts of heavy metals (such as lead). Perchlorate is not easy to decompose, causing long-term pollution to the environment, resulting in soil salinization, which has a greater impact on the environment

Method used

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  • Potassium perchlorate effluent brine treatment apparatus, and technology for recovering potassium perchlorate and sodium chloride from potassium perchlorate effluent brine
  • Potassium perchlorate effluent brine treatment apparatus, and technology for recovering potassium perchlorate and sodium chloride from potassium perchlorate effluent brine
  • Potassium perchlorate effluent brine treatment apparatus, and technology for recovering potassium perchlorate and sodium chloride from potassium perchlorate effluent brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Pump 5 tons of waste brine containing 1% potassium perchlorate and 12% sodium chloride (by mass percentage) into the MVR crystallization evaporator for concentration: heat the waste brine to 90°C, pump it into the crystallization evaporator, start the compressor, Start to evaporate. When the waste brine is concentrated to the saturated crystallization of sodium chloride, it is pumped into the sodium chloride thickener to start discharging the sodium chloride material, and the material in the thickener enters the sodium chloride centrifuge for centrifugation to obtain sodium chloride solid and mother liquor I. The mother liquor I is collected in the mother liquor tank I, and when the concentration of potassium perchlorate does not reach near saturation, it is transported to the crystallization evaporator through the mother liquor pump I to continue to evaporate. When the concentration of potassium perchlorate in the evaporative crystallizer was nearly saturated (when the...

Embodiment 2

[0049] Pump 20 tons of waste brine containing 2% potassium perchlorate and 15% sodium chloride (by mass percentage) into the MVR crystallization evaporator for concentration: heat the waste brine to 100°C, pump it into the crystallization evaporator, start the compressor, Start to evaporate. When the waste brine is concentrated to the saturated crystallization of sodium chloride, it is pumped into the sodium chloride thickener to start discharging the sodium chloride material, and the material in the thickener enters the sodium chloride centrifuge for centrifugation to obtain sodium chloride solid and mother liquor I. The mother liquor I is collected in the mother liquor tank I, and when the concentration of potassium perchlorate does not reach near saturation, it is transported to the crystallization evaporator through the mother liquor pump I to continue to evaporate. When the concentration of potassium perchlorate in the evaporative crystallizer was nearly saturated (when t...

Embodiment 3

[0052] Pump 100 tons of waste brine containing 3% potassium perchlorate and 17% sodium chloride (by mass percentage) into the MVR crystallization evaporator for concentration: heat the waste brine to 110°C, pump it into the crystallization evaporator, start the compressor, Start to evaporate. When the waste brine is concentrated to the saturated crystallization of sodium chloride, it is pumped into the sodium chloride thickener to start discharging the sodium chloride material, and the material in the thickener enters the sodium chloride centrifuge for centrifugation to obtain sodium chloride solid and mother liquor I. The mother liquor I is collected in the mother liquor tank I, and when the concentration of potassium perchlorate does not reach near saturation, it is transported to the crystallization evaporator through the mother liquor pump I to continue to evaporate. When the concentration of potassium perchlorate in the evaporative crystallizer was nearly saturated (when ...

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Abstract

The invention discloses a potassium perchlorate effluent brine treatment apparatus and a technology for recovering potassium perchlorate and sodium chloride from potassium perchlorate effluent brine. The apparatus comprises an evaporative concentration and crystallization system and a freezing crystallization system. The potassium perchlorate effluent brine treatment apparatus fully utilizes the difference of the solubility and the concentration of sodium chloride and potassium perchlorate in the potassium perchlorate effluent brine, sodium chloride first precipitates through evaporative concentration at a high temperature, potassium perchlorate then precipitates through cooling crystallization at a low temperature, potassium perchlorate precipitates through further freezing, and a mother liquid is recycled, so effective separation and recovery of sodium chloride and potassium perchlorate in the potassium perchlorate effluent brine are realized, no waste liquids or waste residues are generated, and comprehensive utilization of the potassium perchlorate effluent brine is truly realized.

Description

technical field [0001] The present invention relates to a kind of potassium perchlorate waste brine treatment device and the technology of reclaiming potassium perchlorate and sodium chloride from potassium perchlorate waste brine, particularly relate to the technology based on MVR crystallization evaporator processing potassium perchlorate waste brine and reclaiming potassium perchlorate and sodium chloride, It belongs to the technical field of energy saving and emission reduction. Background technique [0002] Potassium perchlorate is one of the important varieties of perchlorate, which is mainly used in the manufacture of fireworks, safety matches, explosives, meteorological rockets, civilian ignition coal, oxidants, etc. The traditional production process of potassium perchlorate is as follows: sodium chlorate is electrolyzed into sodium perchlorate, then metathesis reaction is carried out with potassium chloride, cooled and centrifuged to obtain potassium perchlorate, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/06C01B11/18
CPCC01B11/18C01D3/06C02F1/048C02F1/22C02F1/38C02F9/00C02F2101/12C02F2301/08
Inventor 张方平江光易智炀易建新宁坚
Owner 湖南傲创科技有限公司
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