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Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite

A technology for high-alumina limonite and blast furnace ironmaking, which is applied to blast furnaces, blast furnace details, furnaces, etc., and can solve the problems of large amount of coke powder and unsatisfactory production quality indicators.

Inactive Publication Date: 2012-07-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the sintering test, the production and quality indicators of the sintering of full-alumina limonite are not satisfactory, and the amount of coke powder is also large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] High-aluminum limonite accounts for 60% of the mass of iron-containing raw materials, and is mixed with fine-grained magnetite concentrate with a mass content of 25%. The grade of fine-grained magnetite concentrate is 60% and the particle size of -200 mesh accounts for more than 70%. Add limestone and dolomite to adjust the alkalinity to 1.9. The optimal process parameters and product quality indicators for sintering are: coke powder ratio 5.8%, mixed material moisture 8.5%, sintering process conditions: ignition negative pressure 5KPa, sintering negative pressure 8KPa , the ignition time is 1.5min, the holding time is 1.0min, the ignition temperature is 1050°C, the material height is 700mm, the yield of sintered ore is 72.29%, the drum strength is 56.13%, and the utilization factor is 1.10t m -2 h -1 .

Embodiment 2

[0023] High-aluminum limonite accounts for 65% of the mass of iron-containing raw materials, and is mixed with fine-grained magnetite concentrate with a mass content of 25%. The grade of fine-grained magnetite concentrate is 62%, and the particle size of -200 mesh accounts for more than 70%. The mass content of quicklime is 2%, and the CaO mass content of quicklime is 75%. The alkalinity is adjusted to 1.8 by adding limestone and dolomite. The optimal process parameters and quality indicators of sintering are: coke powder ratio 5.8%, The moisture content of the mixture is 9.0%, the yield of sintered ore is 74.26%, the drum strength is 58.53%, and the utilization factor is 1.17t m -2 h -1 .

Embodiment 3

[0025]High-aluminum limonite accounts for 65% of the mass of iron-containing raw materials, and is mixed with fine-grained magnetite concentrate with a mass content of 30%. The grade of fine-grained magnetite concentrate is 64.20%, and the particle size of -200 mesh accounts for more than 70%. The mass content of quicklime is 3%, and the CaO mass content of quicklime is 76.21%, and the alkalinity is adjusted to 2.0 by adding limestone and dolomite. The moisture content of the mixture is 8.5%, the sintering process conditions are ignition negative pressure 5KPa, sintering negative pressure 8KPa, ignition time 1.5min, holding time 1.0min, ignition temperature 1050°C, material height 700mm, yield rate of sintered ore is 73.99%, drum The strength is 57.33%, and the utilization factor is 1.18t m -2 h -1 .

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Abstract

The invention discloses a process for producing sintered ore for ironmaking through a blast furnace from high-aluminum limonite. The high-aluminum limonite accounts for 60%-70% of the weight of iron-containing raw material, and fine particle magnetite concentrate accounting for 25%-35% of the weight of the iron-containing raw material is mixed into the iron-containing raw material. The process comprises the following steps of: performing blending, mixing and pelletizing treatment on the iron-containing raw material, a solvent and coke powder; performing sintering, material distribution, ignition, sintering, cooling and particle adjustment on a pelletized mixture to get a finished product of the sintered ore, determining the alkalinity of a sintered mixture according to the requirement of smelting of the blast furnace on the alkalinity, wherein the ordinary range of the alkalinity is 1.7-2.1; and mixing limestone, dolomite and quicklime into the mixture for regulating the alkalinity, wherein the mixing weight of the quicklime is 1-4%. The adding of the fine particle magnetite concentrate can effectively improve the pelletizing effect of the high-aluminum limonite, significantly improve the sintering air permeability, greatly reduce the using quantity of the coke powder, improve the metallogenic conditions during the sintering process of the high-aluminum limonite, effectively improve the quality indexes of the sintered ore and realize the application of the high-aluminum limonite in sintering production.

Description

technical field [0001] The invention relates to a process for producing sintered ore for blast furnace ironmaking by using high-aluminum limonite. Background technique [0002] Looking at the current domestic ironmaking process conditions, iron and steel enterprises usually use the "concentrated material policy" as the guiding ideology of raw material use, and ensure the quality of furnace materials by purchasing high-quality ore. However, in today's increasingly tight iron ore resources, With the gradual reduction of high-quality ore reserves and the soaring price, the pressure on blast furnace production costs is enormous. On the contrary, some iron and steel enterprises have abandoned the traditional idea of ​​"guiding raw material procurement by process conditions" and actively developed application technologies for low-quality raw materials. The use of low-quality and cheap raw materials has become the main way to reduce blast furnace production costs, and the results a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C21B5/00
Inventor 黄柱成孙文东姜涛陈和铁张元波邵远虎郭宇峰李光辉杨永斌白国华梁之凯
Owner CENT SOUTH UNIV
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