Method for applying ferric dust in sintering

Abstract

The invention discloses a method for applying ferric dust in sintering, which relates to a recycling method of metallurgical wastes and belongs to the technical field of black metallurgy sintering. The method comprises the following steps: uniformly mixing 45-50 % ferric dust, 17-22 % of iron ore concentrate, 0.6-0.8 % of hydrated lime, 0.6-0.8 % of bentonite, 1.9-2.1 % of coke powder, 25-30 % ofreturn fines, wherein the particle size of the return fines is below 5mm; pelletizing the mixed material with a pelletizing disc, wherein the pelletizing particle size is 3-8 mm, the size fraction of3-8 mm accounts for 70-80 %, the pelletizing time is 2-3 min, and the moisture of mini pellets is controlled to 10-11 %; and finally sintering the material pelletized by the pelletizing disc, whereinthe sintering technological parameters comprise an igniting time of 1.5-2 min, an igniting negative pressure of 4900 Pa, a sintering suction pressure of 6860 Pa, and a material layer thickness of 500mm. According to the invention, a sinter obtained by the method has an alkalinity of 1.80-1.90, and MgO is controlled to 2.3-2.5 %; after igniting, the mixed material is sintered from top to bottom, and a finished sintering ore product is used by a blast furnace. By directly using the ferric dust as the mixed material for sintering, and directly using the sinter with the dust for blast furnace production, the process flow is simple and convenient, new devices are not needed, and the investment is low.

Description

Technical field: [0001] The invention discloses a method for applying iron-containing dust to sintering, relates to a method for reusing metallurgical waste, and belongs to the technical field of black metallurgy sintering. Background technique: [0002] Iron-containing dust is an important iron-containing waste resource for iron and steel companies. It generally comes from ironmaking, steelmaking, steel rolling and other production processes. It mainly includes sintering dust, ironmaking dust, ironmaking gas ash, water supply gas mud, steelmaking Converter mud, steelmaking dust and steel rolling secondary iron mud, etc. The TFe of iron-containing dust and sludge is low, but if it is reused, it can reduce costs and increase efficiency. [0003] At present, the comprehensive utilization technology of iron-containing dust generally has the disadvantages of complicated process and high investment. Before the application of the present invention, in the patent application No. ...

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Problems solved by technology

[0003] At present, the comprehensive utilization technology of iron-containing dust generally has the disadvantages of complicated process and high investment

Before the application of the present invention, in the patent application No. CNO2114055.3 "Method for Reusing Iron-Containing Dust and Sintering and Returning Ore", the iron-containing dust and sludge were first used as the ball core with sintering ore returning, and the iron-containing dust and sludge was rolled outside A mixture of moderate particle size is formed, used as a raw material for sintering, and then mixed with iron ore powder, flux, coke powder, and returned ore for sintering, and the process is complicated

In the patent application No. CNO2144842.6 "Pellet sinter produced with iron-containing dust and its process method and special shaft furnace", after the production of small ball sinter with iron-containing dust through raw material preparation and sintering process, It is also necessary to add a special shaft furnace, and the investment is relatively high

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