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Method for increasing proportion of sintered limonite

A limonite and proportion technology, applied in the field of increasing the proportion of sintered limonite, can solve the problems of poor use effect, achieve the effect of improving properties, reducing sintering negative pressure, and increasing the proportion of ore blending

Active Publication Date: 2019-09-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these measures have increased the proportion of limonite to a certain extent, when the proportion of limonite reaches a large proportion, the use effect is also poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Particle A (coarse-grained limonite) is manually sieved from iron ore powder, the particle size is 5-8mm and 8-10mm, the mass ratio of the two is 2.5:1, the moisture content is 3.6%, and the total iron content is 61.75%. (CaO+MgO) / (SiO 2 +Al 2 O 3 ) is equal to 0.083, is acidic, and the ratio is 30.01% (mass ratio=coarse-grained limonite / (iron ore powder+solid fuel+alkaline flux));

[0056] Particle B is manually mixed with the mixture and granulated by a cylindrical mixer. The average particle size is 3.56mm, the +5mm particle size accounts for 16.47%, the proportion of iron ore powder in the mixture is 49.31%, and the proportion of solid fuel (coke powder) is 4.30%, alkaline flux ratio 16.38% (6.50% quicklime, 5.75% limestone, 3.92% dolomite, 0.21% serpentine), (coarse-grained limonite + iron ore powder + solid fuel + alkaline flux = 100 %) The proportion of returning to the ore is 25%, the granulation moisture of Particle B is 7.5%; the comprehensive alkalinity of...

Embodiment 2

[0058] Particle A (coarse-grained limonite) is manually sieved from iron ore powder, the particle size is 5-8mm and 8-10mm, the mass ratio of the two is 2.5:1, the moisture content is 3.6%, and the total iron content is 61.75%. (CaO+MgO) / (SiO 2 +Al 2 O 3 ) is equal to 0.083, acidic, with a ratio of 30.02%;

[0059] Particle B is manually mixed and granulated by a cylindrical mixer. The average particle size is 3.65mm, the +5mm particle size accounts for 22.51%, the proportion of iron ore powder in the mixture is 49.31%, and the proportion of solid fuel (coke powder) is 4.3%, the proportion of alkaline flux is 16.38% (6.50% of quicklime, 5.75% of limestone, 3.92% of dolomite, 0.21% of serpentine), the proportion of returned ore is 25%, the granulation moisture of particle B is 7.5%; particle A The comprehensive alkalinity of granule B is 2.0; the cloth is placed in a sintered cup with an inner diameter of 270mm, the cloth height is 850mm, divided into 5 layers, and the heigh...

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Abstract

The invention discloses a method for increasing the proportion of sintered limonite. Sintered mixtures which contain particles A and / or particles B are sintered after being distributed. The method for increasing the proportion of the sintered limonite is characterized in that a material layer is continuously divided into N layers from top to bottom according to the distribution height direction, and the weight percentage of the particles A in the sintered mixtures of different layers of the material layer to the total particles A and the proportion of the particles A to the particles B are controlled; the particles A are acidic limonite; the particles B are alkaline matrix materials, and the particle size of the particles A is greater than the average particle size of the particles B; and N is an integer of 3-10. By adopting the method, the proportion of coarse limonite can be increased from 28-40% to 47-55% (without return ores), and is increased by 10-20%, the suction negative pressure is reduced by 1-2 kPa, and the yield of sinter is increased by 5-10%.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for increasing the proportion of sintered limonite. Background technique [0002] With the development of sintering technology, the height of the material layer continues to increase. Ultra-high material layer sintering (above 1000mm) is the inevitable pursuit of the sintering process of each steel plant. High-material layer sintering has high yield, good sinter strength and low solid fuel consumption. , sintered ore has many advantages, such as good reducibility, but it also has the disadvantage of poor gas permeability of the material layer. [0003] Iron ore resources are the main raw material for sintering. With the decrease of high-quality resources and the rising price, some steel mills (such as Baosteel) have used a large amount of cheap limonite for sintering production based on resource strategy and production cost considerations. The total re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 李光辉刘臣姜涛钟强罗骏彭志伟饶明军张鑫朱忠平董益佳刘会波
Owner CENT SOUTH UNIV
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