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Production method of sintered ores

A production method and technology of sintered ore, which is applied in the field of production that can improve the strength of sintered ore in cold and hot states, can solve the problems of inability to comprehensively improve the strength of sintered cold and hot states, singleness, application range and effect limitations, and achieve tight bonding , reduce the melting point and viscosity of the liquid phase, and improve the strength of cold and hot states

Active Publication Date: 2013-12-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above documents and patents can improve the strength of sintered ore to a certain extent, they can only improve the cold strength or metallurgical strength of sintered ore, and cannot comprehensively improve the cold and hot state strength of sintered ore. Therefore, its application range and effect are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix 85% iron ore powder, 5% steel slag, 5% boron-containing iron ore powder and 3% coke powder, adjust the alkalinity to 1.8-2.2 by adding limestone and quicklime, and then mix them uniformly to form a mixture. Put the mixed material into the cylinder mixer, after forming small balls, add 2% SiC powder, so that the SiC powder is evenly wrapped on the surface of the mixed material ball, and finally spread the material to complete the sintering production.

[0020] The drum strength of the final product sintered ore produced in Example 1 reaches 84.20%, and the low-temperature reduction pulverization index RDI of the sintered ore +3.15 84.00%, RDI -0.15 4.10%.

Embodiment 2

[0022] Mix 80% iron ore powder, 6% steel slag, 6% boron-containing iron ore powder and 4% coal powder, adjust the alkalinity to 1.8-2.2 by adding limestone and quicklime, and then evenly mix it into a mixture. Put the mixed material into the cylinder mixer, after forming small balls, add 4% SiC powder, so that the SiC powder is evenly wrapped on the surface of the mixed material ball, and finally spread the material for sintering production.

[0023] The drum strength of the finished sintered ore produced in Example 2 reaches 82.00%, and the low-temperature reduction pulverization index RDI of the sintered ore +3.15 84.20%, RDI -0.15 is 4.00%.

Embodiment 3

[0025] Mix 71% iron ore powder, 10% steel slag, 11% boron-containing iron ore powder and 5% coal powder, adjust the alkalinity to 1.8-2.2 by adding limestone and quicklime, and mix it into a mixture. Put the mixed material into the cylinder mixer, after forming small balls, add 3% SiC powder, so that the SiC powder is evenly wrapped on the surface of the mixed material balls, and finally the cloth is sintered for production.

[0026] The drum strength of the final product sintered ore produced in Example 3 reaches 83.19%, and the low-temperature reduction pulverization index RDI of the sintered ore +3.15 83.00%, RDI -0.15 was 4.40%.

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Abstract

The invention provides a production method of sintered ores. The production method comprises the following steps: taking the following raw materials: 70-85% of iron ore powder, 5-10% of steel slag, 5-15% of boron-containing iron ore powder, 3-6% of coke powder or pulverized coal and 1-5% of SiC powder; adjusting the alkalinity of sintered ores as ingredients to be 1.8-2.2 by adding limestone and quick lime; feeding a mixture formed by mixing iron ore powder, steel slag, boron-containing iron ore powder and coke powder or pulverized coal uniformly into a drum mixer, adding the SiC powder after pellets are formed, enabling the SiC powder to uniformly wrap the surfaces of the mixture pellets, and finally distributing the materials, thus completing production of the sintered ores. The production method has the beneficial effects that environments with higher alkalinity than the finished sintered ores can be formed inside the sintered ores, and the indexes such as reduction degradation and the like of the sintered ores can be improved, so that the low-temperature reduction degradation index RDI+3.15 is 83.73% and the low-temperature reduction degradation index RDI-0.15 is 4.16%; meanwhile, the metallurgical performance and cold and hot strength of the sintered ores can be substantially improved, the drum strength of the sintered ores is 83.13%, and the fuel consumption of the sintered ores can be reduced.

Description

technical field [0001] The invention belongs to the field of ironmaking raw material production, and in particular relates to a production method capable of increasing the hot and cold strength of sintered ore. Background technique [0002] Sinter is currently the main raw material for blast furnace production, and its quality directly affects the technical and economic indicators of blast furnaces. Especially after iron and silicon reduction in mining enterprises, low-silicon and high-alkalinity sinter has become the mainstream of production. However, due to the low silica content during sintering, the amount of binder phase produced during sintering is small, resulting in the deterioration of the strength of sintered ore. [0003] The strength of sintered ore is analyzed from the aspect of mineral composition. The strength of magnetite, hematite and monocalcium ferrite is higher, followed by calcium faydalite and dicalcium ferrite, and the glass body is the lowest. At the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 刘杰周明顺翟立委张辉徐礼兵孙鹏
Owner ANGANG STEEL CO LTD
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