A production method for improving sintered gas permeability of thick material layer

Abstract

The invention discloses a production method for improving the sintering air permeability of a thick material layer. During the sintering production of a thick material layer, at least one set of supporting devices is arranged perpendicular to the moving direction of the trolley before the sintering machine distributes the materials. The height of the supporting devices is Taiwan 1 / 3 to 4 / 5 of the height of the car fender; the supporting device is more than 2 brackets, and the brackets are connected by several connecting rods; 15%‑25% steelmaking converter slag, 5%‑10% sintering dust, 5%‑10% fine iron oxide powder and 30%‑55% cement; as the sintering progresses, the support retains its original shape , at the tail of the sintering machine, the bracket is broken together with the sinter and then cooled and screened.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and relates to a sintering production method, in particular to a production method for improving the sintering air permeability of a thick material layer. Background technique [0002] With the advancement of domestic ironmaking technology, thick layer sintering, as a production method that can increase production efficiency, reduce fuel consumption and improve sinter quality, has gradually been recognized by the iron and steel industry. However, as the thickness of the material layer increases, the sintering combustion zone and the over-humidity zone become thicker, the weight of the upper layer of sintering mixture increases, and the lower layer of sintering mixture gradually becomes denser, resulting in a sharp drop in the air permeability of the lower part of the entire material layer, which seriously affects the The output and quality of the sintered ore limit the further improvement ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide a production method for improving the sintering air permeability of a thick material layer, utilizing the materials available in the blast furnace, and installing a support device supporting the upper material layer at the lower part of the material layer, The lower part of the material layer is affected by the gravity of the upper part of the material layer to a minimum, and the bulk specific gravity of the lower material layer is reduced, thereby improving the air permeability of the lower material layer. At the same time, the supporting device is carried out together with the sintering, and finally it is the same as the sintered ore. Entering blast furnace production, thus completely solving a series of problems such as sintering using traditional support devices, a series of problems such as large-scale production transformation of the sintering machine, wear of support devices, installation and cost increase.

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