Method for producing potassium salt and sodium salt by using waste incineration fly ash

A technology for waste incineration fly ash and potassium salts, applied in the direction of alkali metal halide purification, etc., can solve the problems of low purity and separation of potassium chloride, and achieve the effect of high purity and yield, good repeatability and stability

Active Publication Date: 2019-07-23
SINOMA INT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem that the sodium salt and potassium salt in the fly ash washing wastewater are not separated in the prior art...

Method used

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  • Method for producing potassium salt and sodium salt by using waste incineration fly ash
  • Method for producing potassium salt and sodium salt by using waste incineration fly ash
  • Method for producing potassium salt and sodium salt by using waste incineration fly ash

Examples

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Embodiment 1

[0033] (1) The waste incineration fly ash is leached with water. The conditions for leaching the fly ash with water are normal temperature and pressure, the leaching time is 0.5h, the liquid-solid ratio is 3, and the solid-liquid separation is obtained to obtain a mixture containing potassium chloride and sodium chloride. solution and residue. The mixed solution was used to leach fresh fly ash under the same conditions for several times continuously, and the number of consecutive leaching times was 5 times to obtain the leaching solution.

[0034] (2) Under normal temperature and pressure, add sodium carbonate to the leaching solution to remove calcium, the dosage of sodium carbonate is 20g / L, the reaction time is 2h, filter to obtain a clear solution.

[0035] (3) Add impurity remover polyacrylamide to the clarified liquid filtered out in step (2). The dosage of impurity remover is 0.3g / L to remove heavy metal impurities. The reaction time is 4h, and filter to obtain clarifie...

Embodiment 2

[0051] (1) The waste incineration fly ash is leached with water. The conditions for leaching the fly ash with water are normal temperature and pressure, the leaching time is 2 hours, the liquid-solid ratio is 5, and the solid-liquid separation is obtained to obtain a mixed solution containing potassium chloride and sodium chloride. and filter residue. The mixed solution was used to leach fresh fly ash under the same conditions for several times continuously, and the number of consecutive leaching times was 7 times to obtain the leaching solution.

[0052] (2) Under normal temperature and pressure, add precipitant sodium carbonate to the leaching solution to remove calcium, the amount of sodium carbonate added is 40g / L, react for 4 hours, filter to obtain a clear solution.

[0053] (3) Add impurity remover sodium sulfide to the clarified liquid filtered out in step (2) in an amount of 0.7 g / L to remove heavy metal impurities, react for 8 hours, and filter to obtain a clarified ...

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Abstract

The invention discloses a method for producing potassium salt and sodium salt by using waste incineration fly ash, comprising the following steps: extracting waste incineration fly ash with water to obtain an extract; removing calcium ions and heavy metal impurities in the extract, and adjusting the pH of the solution to 6-8; heating and evaporating to concentrate the solution obtained in the previous step until crystallization, immediately filtering to obtain crystals sodium chloride, and naturally cooling the filtrate to room temperature for crystallization to obtain crystals crude potassiumchloride; dissolving the crude potassium chloride in water with a mass ratio of the crude potassium chloride to water is 1:1-1:1.9, heating and evaporating the solution until crystallization, and immediately separating the solid and liquid to get crystals pure potassium chloride and filtrate; and supplementing sodium chloride into the filtrate obtained in the previous step, cooling for crystallization, and filtering to obtain crystals pure potassium chloride. The invention can separate sodium salt and potassium salt in fly ash washing wastewater, and obtain high purity or industrial grade ofsodium chloride and potassium chloride crystals.

Description

technical field [0001] The invention relates to recycling of environment-friendly resources, in particular to a method for producing potassium salt and sodium salt by utilizing waste incineration fly ash. Background technique [0002] Potassium is one of the macroelements necessary for the growth of crops and one of the important elements affecting the yield of crops. In the world, potassium is usually extracted from soluble potassium ore or potassium salt is used as raw material to make potassium fertilizer. More than 92% of the world's proven reserves are distributed in North America, Western Europe and Russia. my country's potash reserves only account for 2.6% of the world's total reserves. Not only are the reserves small, but the distribution is extremely uneven, mostly in the northwest and southwest regions. Potassium chloride is mostly dependent on imports, with an average annual import of 5-6 million tons of potash fertilizers, worth 700-800 million US dollars; in 201...

Claims

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Application Information

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IPC IPC(8): C01D3/14
CPCC01D3/14C01P2002/72C01P2006/80
Inventor 冯冬梅陈晶晶徐磊陈磊朱明秀王君
Owner SINOMA INT ENG
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