Sintered mixture preparation method, sintered mixture distribution apparatus and sintered mixture distribution method

Abstract

The invention relates to a sintered mixture preparation method, a sintered mixture distribution apparatus and a sintered mixture distribution method, wherein the raw materials of the sintered mixturecomprise iron ore powder, coke powder, return ore, quicklime and limestone. The sintered mixture preparation method comprises: placing iron ore powder, quicklime, return ore with a particle size of less than 3 mm after wetting, coke powder with a particle size of less than 3 mm, limestone and water to a primary mixer, and uniformly mixing to obtain a primary mixture; and placing the primary mixture, return ore with a particle size of 3-5 mm after wetting, coke powder with a particle size of more than 3 mm, limestone with a particle size of greater than 3 mm and water to a secondary intensive mixer, and uniformly mixing to prepare the sintered mixture. The sintered mixture distribution method comprises: distributing the sintered mixture onto a sintering machine in layers through the sintered mixture distribution apparatus comprising three sets of multi-roller material distributors, wherein the particle sizes of the layers are sequentially reduced from bottom to top, the particle size ofthe first layer is more than 8 mm, the particle size of the second layer is 5-8 mm, the particle size of the third layer is 3-5 mm, and the particle size of the uppermost layer is less than 3 mm. According to the present invention, the particle size ratio of the sintered mixture is improved, the precise segregation multi-layer material distribution is achieved, and the gas permeability and the sintering utilization coefficient of the sintered mixture are improved.

Description

technical field

[0001] The invention belongs to the technical field of ironmaking production, and in particular relates to a method for preparing a sintering mixture capable of improving the air permeability of a sintering layer, and a method and device for distributing it. Background technique

[0002] Sinter is the main raw material for smelting molten iron in blast furnaces in my country. At present, the commonly used production equipment is belt-type draft sintering machine. Thick bed sintering is a widely used sintering technology, which has the advantages of improving sinter strength and reducing sintering fuel consumption, but the application of thick bed sintering technology also faces some difficulties.

[0003] With the thickening of the sintering material layer, the airflow resistance through the material layer increases, and the sintering speed slows down, which not only increases the power consumption of the fan, but also leads to a decrease in sintering product...

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