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A method for improving low-temperature reduction powdering of iron ore sinter

A technology of sintering ore and low temperature, which is applied in the field of iron and steel metallurgy to achieve the effect of strong operability, low equipment requirements, and the smooth operation of blast furnaces

Active Publication Date: 2019-01-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the prior art, the effect of reducing the low-temperature reduction pulverization of sinter in the blast furnace is not ideal enough, so there is an urgent need for a method to effectively reduce the low-temperature reduction pulverization of iron ore sinter and improve the quality of sinter into the furnace

Method used

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  • A method for improving low-temperature reduction powdering of iron ore sinter
  • A method for improving low-temperature reduction powdering of iron ore sinter
  • A method for improving low-temperature reduction powdering of iron ore sinter

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Experimental program
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Effect test

Embodiment 1

[0029] The main component of the iron additive provided by the invention is Fe 2 o 3 : 25.52%, Fe 3 o 4 : 10.63%, CaO: 0.75%, SiO 2 : 44.46%, Al 2 o 3 : 1.04%; MgO: 1.25%; BaO: 9.51%, impurity content: 6.84%, 85% for particles smaller than 0.105mm, 15% for 0.074mm, add 3kg to 100kg sintering mixture; under laboratory conditions , fully mixed and granulated, and roasted in a simulated sintering environment; then the sinter sample was tested for low-temperature reduction pulverization characteristics by a static method, and the low-temperature reduction pulverization rate (RDI -6.3 , RDI -3.15 , RDI -0.5 ) to express and record the experimental results.

Embodiment 2

[0031] The main component is Fe 2 o 3 : 29.6%, Fe 3 o 4 : 14.99%, CaO: 1.35%, SiO 2 : 41.55%, Al 2 o 3 : 0.75%; MgO: 0.92%; BaO: 6.32%, impurity content: 4.50%, particle size less than 0.105mm is 88%, 0.074mm is 12% iron additives, added in 100kg sintering mixture 5kg, under laboratory conditions, fully mixed and granulated, and roasted in a simulated sintering environment; then the sintered ore sample was tested for low-temperature reduction pulverization characteristics by a static method, and the low-temperature reduction pulverization rate (RDI -6.3 , RDI -3.15 , RDI -0.5 ) and record the experimental results.

Embodiment 3

[0033] The particle size is less than 0.105mm is 81%, 0.074mm is 19%, the main component is Fe 2 o 3 : 21.6%, Fe 3 o 4 : 12.01%, CaO: 0.95%, SiO 2 : 43.85%, Al 2 o 3: 1.05%; MgO: 0.79%; BaO: 13.3%, and the impurity content is: 6.45%. Add 2kg of iron additives to 100kg of sintering mixture. The sintered ore sample was detected by the static method for low-temperature reduction pulverization characteristics, and the low-temperature reduction pulverization rate (RDI -6.3 , RDI -3.15 , RDI -0.5 ) and record the experimental results.

[0034] Comparing and analyzing the results of the above three examples with the RDI without adding iron additives, the calculation results are shown in Table 1, and Table 1 is the comparison of RDI results (wt, %).

[0035] Table 1

[0036]

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Abstract

The invention mainly relates to a method for improving low-temperature reduction powdering of iron ore sintered ore. The method comprises the following steps that an appropriate amount of iron additive with the certain grain composition (by mass percentage) is added in the working procedure of batching of raw material ore of the sintered ore; and after the iron additive is fully mixed with a sintering mixture and made into grains, distribution, sintering and roasting are conducted. By adding the iron additive, the low-temperature reduction powdering rate (represented by a reduction powdering index RDI) of the iron ore sintered ore can be effectively decreased, and the in-furnace quality of the sintered ore is improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of iron and steel metallurgy, and mainly relates to a method for improving the low-temperature reduction pulverization of iron ore sintered ore. 【Background technique】 [0002] For a long time, the "blast furnace-converter" long process has dominated iron and steel metallurgy, and the quality of raw materials for ironmaking has an important impact on various technical and economic indicators of blast furnace ironmaking production. Among them, the degree of pulverization of sinter at low temperature reduction is closely related to the air permeability of the blast furnace state. The reduction pulverization degree of sinter usually adopts the low-temperature reduction pulverization ratio (RDI -3.15 ) to characterize. The sintered ore is prone to cracking and pulverization during the reduction process in the low-temperature area of ​​the upper part of the blast furnace. This phenomenon is mainly due to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 邢相栋陈云飞
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY