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Method for separating mixed salt of potassium fluoride, potassium bromide, potassium carbonate and potassium bicarbonate

A technology of potassium bicarbonate and potassium bromide, which is applied in the field of potassium fluoride mixed salt, potassium bicarbonate, potassium bromide, and potassium carbonate separation, can solve problems such as complex composition, high processing cost, and inability to realize resource utilization, and achieve Reduce pollution and hazards, achieve the effect of resource recovery

Active Publication Date: 2022-02-01
自然资源部天津海水淡化与综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium carbonate, potassium bicarbonate, potassium bromide, and potassium fluoride mixed salt have the characteristics of complex composition, high treatment cost, and great environmental hazards. Conventional salt washing processes, high-temperature oxidation, high-temperature carbonization, and advanced oxidation cannot be used to realize resource recovery. , it is difficult to directly deal with

Method used

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  • Method for separating mixed salt of potassium fluoride, potassium bromide, potassium carbonate and potassium bicarbonate
  • Method for separating mixed salt of potassium fluoride, potassium bromide, potassium carbonate and potassium bicarbonate
  • Method for separating mixed salt of potassium fluoride, potassium bromide, potassium carbonate and potassium bicarbonate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0082] Get 1kg of potassium carbonate, potassium bicarbonate, potassium bromide, and potassium fluoride mixed salt, add the leaching mother liquor (saturated potassium bicarbonate aqueous solution) and stir evenly, then introduce carbon dioxide, the pH of the salt solution drops to 7.8 for solid-liquid separation, and obtain carbonic acid Potassium hydrogen crude salt and filtrate. Potassium bicarbonate crude salt is washed with water, and the amount of water added is 1.5 times the quality of potassium fluoride, potassium bromide, potassium carbonate, and potassium bicarbonate mixed salt. After washing is completed, solid-liquid separation is carried out. The obtained solid is potassium bicarbonate product, and the obtained solution Return to the leaching step to serve as the leaching mother liquor; add hydrobromic acid to the filtrate to make the pH drop to 3.6, and then add potassium hydroxide to make the pH of the solution 7.3. The obtained neutral solution is heated to 121...

Embodiment 2

[0084] Take 1 kg of potassium carbonate, potassium bicarbonate, potassium bromide, and potassium fluoride mixed salt, add the leaching mother liquor and stir evenly, then pass in carbon dioxide, and the pH of the salt solution drops to 7.5 for solid-liquid separation to obtain potassium bicarbonate coarse salt and filtrate. Potassium bicarbonate coarse salt is washed with water, and the amount of water added is 1.2 times the quality of potassium fluoride, potassium bromide, potassium carbonate, and potassium bicarbonate mixed salt. After washing, solid-liquid separation is carried out. The obtained solid is potassium bicarbonate product, and the obtained solution Return to the leaching step to serve as the leaching mother liquor; hydrobromic acid is added to the filtrate to make the pH drop to 3.8, and then potassium hydroxide is added to make the pH of the solution 6.8. The obtained neutral solution is heated to 123° C. for evaporation and concentration, and after heat preserv...

Embodiment 3

[0086] Take 1 kg of mixed salt of potassium carbonate, potassium bicarbonate, potassium bromide, and potassium fluoride, add the leaching mother liquor and stir evenly, then pass in carbon dioxide, and the pH of the salt solution drops to 7.3 for solid-liquid separation to obtain potassium bicarbonate coarse salt and filtrate. Potassium bicarbonate crude salt is washed with water, the amount of water added is 1 time of the quality of potassium fluoride, potassium bromide, potassium carbonate, potassium bicarbonate mixed salt, after washing is completed, solid-liquid separation is carried out, the obtained solid is potassium bicarbonate product, and the obtained solution Return to the leaching step to serve as the leaching mother liquor; hydrobromic acid is added to the filtrate to reduce its pH to 3, and then potassium hydroxide is added to make the pH of the solution 7.5. The obtained neutral solution is heated to 122° C. for evaporation and concentration, and after heat prese...

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Abstract

The invention discloses a method for separating potassium fluoride, potassium bromide, potassium carbonate and potassium bicarbonate mixed salt. The method comprises the following steps: firstly, dissolving potassium fluoride, potassium bromide and potassium carbonate in a leaching mother solution in a mother solution leaching manner; introducing carbon dioxide to convert potassium carbonate dissolved in the leaching mother liquor into potassium bicarbonate, separating to obtain a liquid phase and potassium bicarbonate crude salt, purifying the liquid, and returning washing water to the leaching process to serve as the leaching mother liquor; adding hydrobromic acid to convert potassium bicarbonate in the liquid phase into potassium bromide, and adjusting the solution to be neutral; evaporating and concentrating the neutral solution to obtain potassium bromide and evaporation completion liquid; cooling the evaporation completion liquid, adding seed crystals to obtain potassium fluoride hydrate and circulating mother liquor, and returning the circulating mother liquor to the evaporation and concentration process. According to the method, chemical resources in the mixed salt of potassium fluoride, potassium bromide, potassium carbonate and potassium bicarbonate can be separated and recycled, so that the aim of recycling and harmlessness treatment is fulfilled.

Description

technical field [0001] The invention relates to a method for separating mixed salts of potassium carbonate, potassium bicarbonate, potassium bromide and potassium fluoride, in particular to a method for recycling and utilizing chemical resources in fine chemical by-product waste salt and obtaining inorganic salt products. Background technique [0002] In the fine chemical synthesis process, the inorganic alkali potassium carbonate is usually used as an acid-binding agent, and with the occurrence of fluorination and bromination reactions, a large amount of mixed salts containing potassium carbonate, potassium bicarbonate, potassium bromide, and potassium fluoride will be produced. . Potassium carbonate, potassium bicarbonate, potassium bromide, and potassium fluoride mixed salt have the characteristics of complex composition, high treatment cost, and great environmental hazards. Conventional salt washing processes, high-temperature oxidation, high-temperature carbonization, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02C01D3/10C01D7/10
CPCC01D3/02C01D3/10C01D7/10
Inventor 钟云龙武海虹吴丹路绍琰王泽江郭淑元张琦黄西平
Owner 自然资源部天津海水淡化与综合利用研究所
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