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Method for manufacturing ultra-low alkalinity high-strength sintered ore

A manufacturing method and technology for sintered ore, applied in the field of iron and steel metallurgy sintering, can solve the problems of reducing the production cost of high-strength sintering ore, low iron grade, etc., achieve high drum strength and grade, reduce MgO content, reduce alkalinity and SiO2 the reducing effect of

Inactive Publication Date: 2019-12-31
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a kind of manufacture method of ultra-low alkalinity high-strength sintered ore, mainly solves the problem of using high SiO in the prior art 2 The technical problem of low iron grade of sintered ore produced by iron ore with low content, the invention reduces the production cost of high-strength sintered ore

Method used

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Embodiment 1

[0021] Embodiment 1, a kind of manufacturing method of low-alkalinity high-strength sintered ore, comprises the following steps:

[0022] 1) configure magnesia flux, crush the dolomite with a ball mill, and control the dolomite with a particle size of ≤3mm to account for more than 75% of its total mass; the weight percentage of the dolomite composition is CaCO 3 : 50-60%, MgCO 3 : 40-50%, the balance is unavoidable impurities;

[0023] 2) Batching, weighing the iron ore and magnesia flux used for sintering according to the ratio, and controlling the binary alkalinity R of the sintering ore 2 is 1.70, SiO in sinter 2 The weight percent composition of MgO is 5.7%, and the weight percent composition of MgO is 1.0%;

[0024] 3) Mix and granulate, put the prepared iron ore and magnesia flux into a mixing drum for one mixing, add water and stir during the first mixing, and obtain a primary mixing material after mixing, and put it into the primary mixing material h 2 The weight ...

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Abstract

The invention discloses a method for manufacturing ultra-low alkalinity high-strength sintered ore. The technical problem of low iron grade of sintered ore produced by using iron ore with the high SiO2 content in the prior art is mainly solved. According to the technical scheme, the method for manufacturing the ultra-low alkalinity high-strength sintered ore comprises the steps that (1) a magnesium flux is prepared; (2) burdening is carried out, and the iron ore and the magnesium flux used for sintering are weighed according to the proportion, the binary alkalinity R2 of the sintered ore is controlled to be 1.70-1.80, the weight percentage of SiO2 in the sintered ore is 5.0%-5.7%, and the weight percentage of MgO is 1.0%-1.2%; (3) mixing and granulating are carried out, a primary mixing material is transferred into a secondary mixing drum for mixing and granulating, and a secondary mixing material is obtained after granulating; and (4) air extracting and sintering are carried out on the secondary mixing material, and after sintering, the finished sintered ore is obtained. The high-strength sintered ore produced by the iron ore with the high SiO2 content is obtained, and the significant benefit is achieved.

Description

technical field [0001] The invention relates to a method for manufacturing sintered ore as raw material for blast furnace ironmaking, in particular to a method for manufacturing sintered ore with ultra-low alkalinity and high strength, and belongs to the technical field of iron and steel metallurgy sintering. Background technique [0002] Sinter is one of the main iron-containing raw materials for blast furnace ironmaking in my country. High-grade and high-strength sinter is an important raw material technical guarantee for blast furnace smelting to obtain excellent technical and economic indicators. Over the past few years, with the intensification of competition in the steel market and the deterioration of iron ore resources, many steel plants have had to use some high-SiO 2 content of iron ore to reduce costs, SiO in such iron ore 2 The mass content of ≥7%. [0003] Using high SiO 2 content of iron ore to produce sinter, according to the traditional sintering process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/16
CPCC22B1/16C22B1/2406
Inventor 韩宏松韩凤光
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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