Method and equipment for extracting potassium salt from sintering machine head electroprecipitating dust in metallurgical industry

Abstract

The invention relates to a method and equipment for extracting potassium salt from sintering machine head electroprecipitating dust in the metallurgical industry. The method comprises the following steps of stirring and leaching, chemical precipitation, mechanical centrifugation, and evaporation and crystallization. The equipment comprises a sintering dust leaching pool which is sequentially connected with a primary pressure-filtration unit, a rich liquid storage tank, a chemical precipitation tank, a mechanical centrifugation unit, and an evaporation and crystallization unit. According to the method disclosed by the invention, electroprecipitating dust is directly leached by using industrial water to leach potassium salt; the chemical method enables impurity metal ions in the leachate to rapidly and stably form a precipitate, and the product purity is higher; the solution after precipitation is efficiently separated by mechanical centrifugation; the filter residue is secondarily leached by adding the industrial water and the condensed water returned by the evaporation and crystallization unit, and the barren solution generated by the secondary pressure-filtration and centrifugation unit is returned as a sintering ash leachate, thus ensuring furthest extraction for the potassium salt in the sintering ash, and ensuring the reasonable allocation of the leachate of the whole system, without wastewater drainage. The equipment disclosed by the invention is simple in structure, economic and reliable, and capable of obtaining a high-purity potassium salt product after evaporation and crystallization, and drying.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste resources, and also belongs to the technical field of chemical production, and specifically relates to a method and equipment for extracting potassium salt from electric dust collector ash of sintering heads in the metallurgical industry. Background technique [0002] The metallurgical industry is an important pillar industry of my country's rapid economic development, but it is also one of the industries with high energy consumption and high pollution. Among them, a large amount of dust generated during the sintering process is one of the main sources of pollution in the metallurgical industry. According to statistics, the electric dust removal ash (sintered ash for short) of sintering head produced in my country every year is as high as 15 million tons, which contains a large amount of iron, calcium, silicon, carbon, potassium, sodium, chlorine and other elements...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method and equipment for extracting potassium salt from the electric dust collector dust of sintering head in the metallurgical industry, so as to solve the problem of alkali metal elements such as potassium and sodium contained in the existing process when the sintering ash returns to the sintering process. Continuous enrichment will have a serious adverse effect on the original process, and at the same time make the extracted potassium salt meet the requirements of agricultural supplies, and alleviate the current situation of shortage of potassium salt in my country

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