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Sintering ore with uniform grain size and production method thereof

A sintered and uniform technology, applied in the field of iron and steel metallurgy, can solve the problems of poor reduction capacity of blast furnace, high solid fuel consumption, and large proportion of small and large particle sizes, so as to reduce the consumption of solid fuel, facilitate strengthening smelting, and improve particle size. level effect

Inactive Publication Date: 2020-04-17
TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Sinter is the main raw material for blast furnace ironmaking, and its ratio is 60%-85%. With the improvement of blast furnace intensified smelting, higher requirements are put forward for the quality of sinter in the furnace. Obvious impact, when the particle size below 10mm accounts for a large proportion, it will directly affect the air permeability of the blast furnace, causing the blast furnace to hold pressure; when the particle size is above 40mm, the proportion is high, resulting in poor reducing ability of the blast furnace and increased coke ratio
[0003] The sinter produced by the prior art has a drum index of 74%, a solid fuel consumption of 55kg / t, and an average sinter particle size of 18.94mm. The specific composition is as follows: the particle size greater than 40mm accounts for 10%; 15.15%; 16-25mm size accounted for 15.23%; 10-16mm size accounted for 29.37%; less than 10mm size accounted for 30.25%. Low index, high consumption of solid fuel, unfavorable for intensified smelting of blast furnace

Method used

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  • Sintering ore with uniform grain size and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] S1. Batching process: Mix the following raw materials by mass fraction: 18% western powder, 24% PB powder, 12% goldbuba powder, 5% Brazilian coarse powder, 6% FMG mixed powder, 15% returned ore, dolomite powder 5.0%, white ash 6.5%, limestone powder 4%, coal powder 2.3%, coke powder 2.2%;

[0029] b. Adding water and mixing process: adding water to the mixture in S1 and controlling the moisture content of the mixture at 7.1-7.5%;

[0030] c. Thermal parameter control: spread the mixed material on the sintering machine, control the ignition temperature of the sintering machine at 1050±50°C, control the thickness of the sintering material layer at 760-780mm, and control the end point temperature at 390±30°C.

[0031] Preferably, the temperature of the waste gas in the large flue is controlled at 120-140° C., and the speed of the sintering machine is controlled at 1.8-2.0 m / min.

Embodiment 2

[0033] S1. Batching process: mix the following raw materials by mass fraction: super special powder 15%, Newman powder 20%, Mike powder 10%, Brazilian mixed powder 7%, FMG mixed powder 14.6%, returned ore 15%, dolomite powder 4.0 %, white ash 7%, limestone powder 3%, coal powder 2.2%, coke powder 2.2%;

[0034] b. Adding water and mixing process: adding water to the mixture in S1 and controlling the moisture content of the mixture at 7.1-7.5%;

[0035] c. Thermal parameter control: spread the mixed material on the sintering machine, control the ignition temperature of the sintering machine at 1050±50°C, control the thickness of the sintering material layer at 760-780mm, and control the end point temperature at 390±30°C.

[0036] Preferably, the temperature of the waste gas in the large flue is controlled at 120-140° C., and the speed of the sintering machine is controlled at 1.8-2.0 m / min.

Embodiment 3

[0038] S1, batching process: mix the following raw materials by mass fraction: Luobo river powder 6.2%, PB powder 25%, Yangdi powder 15%, Indian powder 5%, Brazilian mixed powder 15%, returned ore 15%, dolomite powder 5.0%, white ash 7.5%, limestone powder 2%, coal powder 2.2%, coke powder 2.1%;

[0039] b. Adding water and mixing process: adding water to the mixture in S1 and controlling the moisture content of the mixture at 7.1-7.5%;

[0040] c. Thermal parameter control: spread the mixed material on the sintering machine, control the ignition temperature of the sintering machine at 1050±50°C, control the thickness of the sintering material layer at 760-780mm, and control the end point temperature at 390±30°C.

[0041]Preferably, the temperature of the waste gas in the large flue is controlled at 120-140° C., and the speed of the sintering machine is controlled at 1.8-2.0 m / min.

[0042] After inspection, the above 3 embodiments of the present invention and the various dat...

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Abstract

The invention belongs to the technical field of steel metallurgy, and particularly relates to a sintering ore with uniform grain size and a production method thereof. According to the mass ratio in araw material, a main material comprises 5wt% - 10wt% of Brazil Coarse Fines, 10wt% - 15wt% Brazilian Blended Fines, less than or equal to 25wt% of PB Fines, less than or equal to 25wt% of Newman Fines, less than or equal to 15wt% of Mac Fines, less than or equal to 20wt% of Jimblebar Fines, less than or equal to 15wt% of Indian Fines, less than or equal to 25wt% of FMG Blended Fines, less than orequal to 25wt% of Western Fines, less than or equal to 15wt% of Super Special Fines, less than or equal to 15wt% of Yandi Fines, less than or equal to 15wt% of Robe River Fines; and an auxiliary material comprises 15wt% of return fines, 4wt% - 5wt% of dolomite fines, 6.4wt% - 7.5wt% of pale gray, 2wt% - 4wt% of limestone fines, 2.2wt% - 2.3wt% of coal fines and 2.1wt% - 2.2wt% of coke fines.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a sintered ore with uniform particle size and a production method thereof. Background technique [0002] Sinter is the main raw material for blast furnace ironmaking, and its ratio is 60%-85%. With the improvement of blast furnace intensified smelting, higher requirements are put forward for the quality of sinter into the furnace. Obvious impact, when the particle size below 10mm accounts for a large proportion, it will directly affect the air permeability of the blast furnace, causing the blast furnace to hold pressure. When the particle size is above 40mm, the proportion is high, resulting in poor reducing ability of the blast furnace and increased coke ratio. [0003] The sinter produced by the prior art has a drum index of 74%, a solid fuel consumption of 55kg / t, and an average sinter particle size of 18.94mm. The specific composition is as follows: the part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 张文政吴德桂俞军毅贾学军徐宁于惠宋恩城高爽
Owner TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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