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Blast furnace high-aluminum slag smelting method

A high-alumina slag and smelting method technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as unstable production and high smelting costs of blast furnace molten iron, and achieve the effects of improving air permeability, promoting cost reduction and increasing efficiency

Inactive Publication Date: 2017-04-05
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for smelting blast furnace high alumina slag, which mainly solves the technical problems of unstable blast furnace production and high cost of blast furnace hot metal smelting in blast furnace high alumina slag smelting in the prior art

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Embodiment Construction

[0018] The present invention will be described in further detail below through specific examples.

[0019] The invention is at 3250m 3 See Table 1 for blast furnace production data, blast furnace smelting control parameters, and blast furnace smelting data in Table 2.

[0020] Table 1 Control parameters of blast furnace smelting in the present invention

[0021]

[0022] Table 2 Blast furnace smelting data

[0023]

[0024] As can be seen from Table 2, adopt the method of the present invention, the Al in the blast furnace slag 2 o 3 Even if the mass percentage is increased from 15.5% of the conventional process to 15.7%, the condition of the blast furnace is still stable and smooth, the utilization factor is increased by 2.75% compared with the original, the coke ratio is reduced by 13kg / t iron, and the coal ratio is increased by 11kg / t t iron, the fuel ratio is reduced by 2kg / t iron, and the economic benefit is remarkable.

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Abstract

The invention discloses a blast furnace high-aluminum slag smelting method to mainly solve the technical problems of unstable production and high blast furnace molten iron smelting cost of blast furnace high-aluminum slag smelting blast furnaces in the prior art. The blast furnace high-aluminum slag smelting method comprises the following steps: 1, preparing a raw material: preparing the raw material according to the following control requirements: the slag-iron ratio is not more than 300 kg / t and the mass percentage content of Al2O3 in the slag is not more than 17%, adding small-size coke to the raw material, uniformly mixing the raw material and the small-size coke to form ore layers, wherein the raw material comprises, by mass, 70-80% of sintered ores, 15-17% of lump ores and 3-15% of pellet ores, and the small-size coke accounts for 2-5% of the mass of the raw material; 2, distributing: alternately distributing the coke and the ore layers in a blast furnace to form layer and coke layer alternating structure; 3, carrying out blast furnace smelting; and 4, normally discharging iron. The method realizes low-cost high-aluminum slag smelting of the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and relates to a method for smelting blast furnace high alumina slag. Background technique [0002] At present, due to the influence of resource degradation, the aluminum content in iron ore is gradually increasing, resulting in the Al in blast furnace ironmaking slag 2 o 3 As the content increases, the blast furnaces of many manufacturers have a tendency to increase to 15.5% or even 16%. The metallurgical properties of slag (melting temperature and viscosity increase) deteriorate, which affects the stability of blast furnace production. In the traditional blast furnace ironmaking production, people often "talk about aluminum discoloration", in the charge of Al 2 o 3 When the content increases, it is generally to increase the amount of Mg-containing flux in artificial rich ore (sinter or pellets) or directly increase the amount of Mg-containing flux (usually serpentine ore) in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/008
Inventor 韩宏松韩凤光张玉才沈峰满
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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