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High quality sintered ores for COREX smelting reduction process for ironmaking and preparation method thereof

A sintering, high-quality technology, applied in the field of iron and steel metallurgy, to achieve the effect of increasing vertical sintering speed and utilization factor, improving air permeability, and overcoming poor air permeability

Active Publication Date: 2019-04-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the publicly reported documents are all aimed at the blast furnace ironmaking system, and there is no direct technical research or industrial production report on the preparation of sinter with a low reduction pulverization rate for the COREX process

Method used

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  • High quality sintered ores for COREX smelting reduction process for ironmaking and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] According to the requirement of 50% mass percentage of sintered ore in the subsequent smelting, the designed sinter basicity is 1.8 and the MgO content is 1.6%. Divide 30% of the iron concentrate in the total amount of iron concentrate, add finely ground quicklime, 4% dolomite and 1.4% solid fuel (coke powder), which account for 2.5% of the concentrated iron ore obtained by the diversion, for batching and mixing. Homogenize to obtain a mixture 1, wherein the iron concentrate particle size is -0.074mm>40%, and the iron element content is greater than 62.5%. Mixture 1 is made into raw balls of 8mm-20mm directly in a disc ball machine, and the raw ball alkalinity (CaO and SiO) 2 The mass percentage ratio) is 1.0, the MgO content is 1.8%, and the solid fuel mass ratio is 1.4%.

[0041] 70% of the iron concentrate and iron-containing impurities (including iron-containing dust and iron-containing pellets in steel mills) in the total iron concentrate are combined with returne...

Embodiment 2

[0046] According to the requirement of 50% mass percentage of sintered ore in the subsequent smelting, the designed sinter basicity is 1.8 and the MgO content is 1.6%. Divide 50% of the iron concentrate in the total amount of iron concentrate, add finely ground quicklime, 3.5% dolomite and 1.2% solid fuel (anthracite powder) accounting for 3% of the concentrated iron ore obtained by the diversion to it for batching and mixing. Homogenize to obtain a mixture 1, wherein the iron concentrate particle size is -0.074mm>40%, and the iron element content is greater than 62.5%. The mixture is directly 8mm-20 formed by a disc pelletizing machine, the green ball basicity is 1.2, the MgO content is 1.7%, and the solid fuel mass ratio is 1.2%.

[0047] 50% of the iron concentrate and iron-containing miscellaneous materials (including iron-containing dust and iron-containing pellets in steel mills) in the total iron concentrate are combined with returned ore, quicklime, limestone, dolomite...

Embodiment 3

[0053] According to the requirement of 50% mass percentage of sintered ore in the subsequent smelting, the designed sinter basicity is 1.8 and the MgO content is 1.6%. Divide 60% of the iron concentrate in the total amount of iron concentrate, add finely ground quicklime, 2.5% magnesite and 1.4% solid fuel (coke powder), which account for 2% of the concentrate obtained by the diversion, for batching and mixing. Homogenize to obtain a mixture 1, wherein the iron concentrate particle size is -0.074mm>40%, and the iron element content is greater than 62.5%. The mixture is directly formed into 8mm-20mm green pellets in a disc pelletizing machine, the alkalinity of the pellets is 0.8, the MgO content is 1.0%, and the solid fuel mass ratio is 1.4%.

[0054] 40% of the iron concentrate and iron-containing miscellaneous materials (including iron-containing dust in steel mills, iron-containing pellets and iron-containing nugget sifting) in the total iron concentrate are mixed with retu...

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Abstract

The invention provides high quality sintered ores for a COREX smelting reduction process for ironmaking and a preparation method thereof. The preparation method comprises the following steps: dividing30-50% of iron ore concentrate and 4-7% of flux 1 as well as 1.0-1.5% f a solid fuel from the total amount of iron ore concentrate for proportioning, and uniformly mixing the three to prepare flux carbon-burdened green pellets; proportioning the divided residual iron ore concentrate and iron-containing miscellaneous materials, return ores, flux 2 and the solid fuel and uniformly mixing the mixture to obtain a mixed material; and mixing, granulating, distributing, igniting, sintering, cooling, crushing and screening the obtained green pellets and the mixed material to obtain the sintered oresand the return ores. The sintered ores prepared by the method can meet the demand that the low-temperature reduction degradation value of the sintered ores in a COREX vertical furnace: RDI+6.3 is greater than or equal to 50% when the alkalinity is 1.8. The furnace mass ratio of the sintered ores can be greater than 50%, so that the cost of an ironmaking furnace burden can be lowered effectively.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a high-quality sintered ore used in a COREX smelting reduction ironmaking process and a preparation method thereof. Background technique [0002] COREX is a smelting reduction ironmaking process developed by VAI that uses lump ore or pellets as raw material and non-coking coal as reducing agent and fuel. The COREX process is currently the only smelting reduction ironmaking process that has achieved industrial production. It uses non-coking coal as the main primary energy source and reducing agent, and only uses a small amount of coke to produce molten iron with a quality comparable to blast furnace ironmaking, which greatly reduces The ironmaking process relies on high-quality metallurgical coke, has the characteristics of using coal instead of coke, short process, and less environmental pollution, which meets the strategic requirements of sustainable development of my cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 朱德庆潘建郭正启李启厚薛钰霄李思唯田宏宇石玥鲁胜虎徐继伟王欣
Owner CENT SOUTH UNIV
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