Treatment method of iron and steel smelting dust mud and iron correction material

Abstract

The invention discloses a treatment method of iron and steel smelting dust mud and an iron correction material. The treatment method of the iron and steel smelting dust mud comprises the following steps that S1, dust premixing is conducted, specifically, feeding low-grade dust and high-grade dust into a premixing system to be evenly mixed, and forming the mixed dust; S2, mud cake pre-crushing andmixing: feeding the low-grade mud cake and the high-grade mud cake into a pre-crushing system for crushing and mixing to obtain a mud cake mixture; s3, strong mixing granulation: sending the mixture of the mixed dust and the mud cake into a strong mixing granulation system, and fully mixing to prepare mixed particles; sending the mixed particles into a stockpiling area, and stockpiling for 1-3 days to form an iron correction material. According to the treatment method of the iron and steel smelting dust mud and the iron correction material, the problem that mud cakes generated by low-grade dust and sewage environment treatment are difficult to treat is solved, resource utilization of the iron and steel smelting dust mud is achieved, and good economic and environmental benefits are achieved.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a method for processing iron and steel smelting dust and iron correction materials, so as to realize resource utilization of iron and steel smelting dust. Background technique [0002] At present, a large amount of iron and steel smelting dust, such as dust and mud cake, will be produced in the iron and steel smelting process. The dust is produced by environmental treatment and dust collection in the iron and steel smelting process. In the process of iron and steel smelting, the environmental treatment sewage is produced after flocculation, concentration, and dehydration. The moisture content of the mud cake is 50-70%. (iron content ≥ 35%, zinc content < 1%) can be used by back sintering after mixing; for high-grade and high-zinc dust and mud cake (iron content ≥ 35%, zinc content ≥ 1%) can be pelletized ( Ball diameter ≥ 8mm) or briquetting (briquetting par...

AI Technical Summary

Problems solved by technology

[0002] At present, a large amount of iron and steel smelting dust, such as dust and mud cake, will be produced in the iron and steel smelting process. The dust is produced by environmental treatment and dust collection in the iron and steel smelting process. In the process of iron and steel smelting, the environmental treatment sewage is produced after flocculation, concentration, and dehydration. The moisture content of the mud cake is 50-70%. (iron content ≥ 35%, zinc content < 1%) can be used by back sintering after mixing; for high-grade and high-zinc dust and mud cake (iron content ≥ 35%, zinc content ≥ 1%) can be pelletized ( Ball diameter ≥ 8mm) or briquetting (briquetting particle size ≥ 25mm) enters the rotary hearth furnace or rotary kiln for dezincification and then returns to iron and steel smelting. In the process of pelletizing or briquetting, energy consumption and binder are consumed. Disposal and utilization of furnaces or rotary kilns also requires a lot of energy consumption and a lot of flue gas emissions; and a lot of low-taste dust (iron content ≤ 30%) and mud cakes (low The iron content of high-grade mud cakes is ≤5%, the iron content of high-grade mud cakes is ≤30%, and the production of low-grade mud cakes is more than that of high-grade mud cakes.

[0003] In view of the above situation, it is urgent to develop a new treatment method for iron and steel smelting dust, which can solve the problem of low-taste dust and mud cake that are difficult to dispose of. Iron-forming correction materials to realize resource utilization of iron and steel smelting dust

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