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Method for producing potassium chloride by steel enterprise sintering electro-precipitating dust

A potassium chloride and electrostatic precipitator technology, applied in the direction of alkali metal chloride, etc., can solve the problems of high energy consumption, poor quality of sintered ore, and low production capacity, and achieve low energy consumption, convenient operation, and simple and easy process Effect

Active Publication Date: 2008-08-06
唐山汇鑫嘉德节能减排科技股份有限公司 +1
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Problems solved by technology

However, this process requires leaching at 60-90°C, and multiple evaporation and concentration, which consumes a lot of energy.
[0003] As we all know, the iron and steel industry is regarded as a "big polluter" in today's society. As one of the pollutants, the electrostatic dust in the sintering process has been directly returned to the sintering process to utilize the Fe and C in it, but alkali metals such as K and Na The negative impact of the existence of this process on this process cannot be ignored, and problems such as low production capacity and poor quality of sintered ore have already occurred

Method used

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  • Method for producing potassium chloride by steel enterprise sintering electro-precipitating dust

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Effect test

Embodiment 1

[0020] At room temperature, use a liquid-solid ratio of 1.2 / 1, leaching at a constant speed for half an hour. After solid-liquid separation, the leaching solution is used as the leaching agent for the second leaching, and 0.8% SDD is added at the same time to inhibit the leaching of impurities such as copper, lead, calcium, and magnesium. After filtering, return the filter residue to the sintering process. After the filtrate was evaporated to 1 / 4 volume, it was slowly cooled and crystallized step by step to obtain the potassium chloride product. After analysis, the potassium chloride had a purity of 95.7%, a calcium content of 1.5%, a magnesium content of 0.3%, and a sodium content of 0.6%. The mother liquor is returned and combined with tap water as the initial leachate.

Embodiment 2

[0022] At room temperature, use a liquid-solid ratio of 1 / 1, leaching at a constant speed for half an hour, after solid-liquid separation, the leaching solution is used as the leaching agent for the second leaching, and 1% SDD is added at the same time to inhibit the leaching of impurities such as copper, lead, calcium, and magnesium After filtering, return the filter residue to the sintering process. After the filtrate was evaporated to 1 / 5 volume, it was cooled slowly and crystallized step by step to obtain potassium chloride and sodium chloride products. After analysis, the purity of potassium chloride was 96.6%, the calcium content was 1.5%, the magnesium content was 0.8%, and the sodium content was 1.3% %. The mother liquor is returned and combined with tap water as the initial leachate.

Embodiment 3

[0024] At room temperature, use a liquid-solid ratio of 1.5 / 1, and oscillate at a constant speed for half an hour. After solid-liquid separation, the leaching solution is used as the leaching agent for the second leaching, and 1% SDD is added at the same time to inhibit the leaching of impurities such as copper, lead, calcium, and magnesium. After filtering, return the filter residue to the sintering process. After 1 / 4 volume of the filtrate was evaporated, it was cooled slowly and crystallized step by step to obtain potassium chloride and sodium chloride products. After analysis, the purity of potassium chloride was 96.7%, the content of calcium was 0.96%, and the content of magnesium was 0.55%. The mother liquor is returned and combined with tap water as the initial leachate.

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Abstract

The invention relates to a method for producing potassium chloride by using electric precipitator dust of a sintering process of a steel plant, which belongs to a production technology of potassium salt. Under room temperature, tap water is adopted and is leached by adding appropriate SDD under the condition that liquid-solid ratio is 2 / 1 to 1 / 1; the leaching rate can be up to 95 to 99.5 percent. Filter residue after filtration is returned to the sintering process after drying; leaching liquid is heated and concentrated to 3 / 5 to 4 / 5 of original volume; product of the potassium chloride and sodium chloride is slowly cooled and fractionally crystallized; purity can be up to 95 to 98 percent; total concentration of calcium and magnesium is 0.4 to 3 percent. Crystallization mother liquor is returned for leaching the precipitator dust. The method for producing the potassium chloride by using the electric precipitator dust has simple and easy process, little energy consumption, without wastewater discharged; at the same time, the method makes up current situation of shortage of potassium recourse in our country to a great extend and avoids that vicious circle of alkali metal affects normal proceeding of the sintering process of steel industry.

Description

technical field [0001] The invention relates to a method for producing potassium chloride by utilizing sintered electrostatic precipitator ash in iron and steel enterprises, which belongs to the potassium salt production technology. It also belongs to the solid waste resource treatment technology of iron and steel enterprises. Background technique [0002] Potassium chloride is an important inorganic chemical raw material, mainly used in the production of agricultural potassium fertilizer and the preparation of other potassium-containing products. The main methods of producing potassium chloride in industry are cold decomposition forward flotation method, reverse flotation cold crystallization method, hot melting method, brine mixing method, etc., and the main raw materials are potassium halite, carnallite, brine, etc. The production of potassium chloride by using potash salt ore and carnallite requires crushing and flotation of the raw materials first, and then undergoes a...

Claims

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Application Information

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IPC IPC(8): C01D3/04
Inventor 郭占成彭翠张福利潘钊彬
Owner 唐山汇鑫嘉德节能减排科技股份有限公司
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