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Charging method for blast furnace burden

A blast furnace and mixed charging technology is applied in the field of raw material treatment in blast furnace and charging process in blast furnace production, and can solve the problems of phase change pulverization, impact of blast furnace production increase and coke saving, impact on air permeability and liquid permeability of lower part of blast furnace, etc. , to achieve the effect of reducing melting point, reasonable distribution of gas flow, and improving technical and economic indicators of ironmaking

Inactive Publication Date: 2008-10-01
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even the phase change pulverization of calcium orthosilicate (melting temperature 2130°C) will occur, which will seriously affect the air permeability and liquid permeability of the lower part of the blast furnace, which will affect the further increase of blast furnace production and coke saving

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First, the sintered ore with an alkalinity of 2.0 and the pellets with an alkalinity of 0.05 are mixed in the ore storage tank according to the weight ratio of 80:20, and then transported to the top of the furnace by a conveyor belt conveyor or a skip car, and loaded into the blast furnace .

Embodiment 2

[0016] First, the sintered ore with an alkalinity of 2.2 is leaked from the storage tank to the conveyor belt conveyor, and then the pellets with an alkalinity of 0.05 are leaked from the storage tank to the conveyor belt conveyor. The ratio is: 65:35. After being mixed by the conveyor belt conveyor, it is transported to the top of the furnace by the blast furnace feeding belt conveyor or a skip car, and loaded into the blast furnace.

Embodiment 3

[0018] First, the sintered ore with an alkalinity of 2.2 is leaked from the storage tank to the conveyor belt conveyor, and then the pellets and natural lump ore with an alkalinity of 0.05 are leaked from the storage tank to the conveyor belt conveyor respectively. The weight ratio of the furnace ore is: 70:25:5. After being mixed by the conveying belt conveyor, it is transported to the furnace top by the blast furnace feeding belt conveyor or a skip car, and loaded into the blast furnace.

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Abstract

The invention provides a method for mixed-loading blast furnace materials, ironstone and coke are loaded into the furnace hierarchically, characterized in that the ironstone loaded into the furnace is ore having two or more than two different alkalinity, and the ore is mixed according to the matching proportion of furnace alkalinity requirement prior to entering into the blast furnace. The invention solves the problem that each material layer in the original blast furnace owes the diverse formed softening, fusing, falling starting temperatures to diverse alkalinities, causing the bad air and liquid permeability of material post at the lower part of the blast furnace so as to have an influence on the stable operation of the blast furnace. The invention has the characteristics of reducing the alkalinities of initial slag and bosh slag of the high alkalinity sinter, dropping the melting point of the initial slag, promoting the fluidities of the initial slag and the bosh slag, thus improving the air and liquid permeability of material post at the lower part of the blast furnace and creating advantageous conditions for further increased production and coke saving.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, relates to a raw material processing technology in a blast furnace, and is particularly suitable for the charging process in blast furnace production. Background technique [0002] Over the years, the blast furnace charging method has been using iron ore and coke to be loaded into the furnace in layers. The natural lump ore and man-made rich ore (sinter, pellet ore) in the commonly used iron ore are also layered into the furnace according to different types. In the blast furnace production process, in order to ensure that the blast furnace runs smoothly and can produce high-quality molten iron, there must be a suitable basicity of the furnace charge and final slag basicity. Therefore, high-basic sinter and acid pellets or high-basic The use of basicity sinter in combination with acid pellets and natural lump ore is generally recognized as a reasonable charge structure. At presen...

Claims

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Application Information

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IPC IPC(8): C21B5/00C22B1/00
Inventor 王再义邢本策于淑娟刘德军王相力王向锋汤清华尚策张洪宇王志君
Owner ANGANG STEEL CO LTD
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