A kind of sintering method of high ratio limonite

A sintering method and limonite technology, applied in the field of steelmaking, can solve problems such as reduced productivity, high fuel consumption, and slow sintering speed, and achieve the effects of inhibiting crystal transformation, improving combustion efficiency, and improving air permeability

Active Publication Date: 2021-04-06
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the characteristics of high crystalline hydrolimonite, such as loose and porous, low bulk density, high crystal water content, large particle size, easy self-melting, strong assimilation, special sintering liquid phase, and low bonding phase strength, it can be used in high proportion and high crystallization During the sintering process of hydrolimonite, crystal water decomposes to produce pores after being heated, and at the same time, it assimilates to a high degree with the calcium ferrite solution, which deteriorates the gas permeability of the molten zone of the sintered material layer and causes insufficient local heating
Slow sintering speed, lower sinter consolidation strength, lower yield, higher fuel consumption, lower productivity

Method used

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  • A kind of sintering method of high ratio limonite
  • A kind of sintering method of high ratio limonite
  • A kind of sintering method of high ratio limonite

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Take a certain 260m 2 Take the industrial production of hydrolimonite with high ratio and high crystallinity of sintering machine as an example, and explain the specific implementation method:

[0040] A. Mix high crystalline hydrolimonite with a mass ratio of 64.67%, iron-containing concentrates with 28.58%, and iron-containing fine ore with 6.75% in the mixing yard to form a new iron stockpile for future use.

[0041] B, on the basis of A step, add 5.00% limestone, 9.00% dolomite, 5.50% unslaked lime, 5.00% coke powder, and 1.30% anthracite by mass ratio, and mix with A new iron material to obtain Mixture.

[0042] C. Transport the mixture obtained in step B to a drum mixing mixer via a belt, add water to stir and mix to pelletize, control the mixing and pelletizing time for 5.50 minutes, the moisture content of the mixture is 9.70%, and the content of the particle size less than 3mm is 32.50%.

[0043] D. Transport the mixture after granulation in step C to the si...

Embodiment 2

[0046] In order to facilitate the comparison and explanation of the problem, the production data of the same sintering machine with high crystalline hydrolimonite sintering and without high crystalline hydrolimonite sintering were compared. See Table 1 for the ratio of the material structure, Table 2 for the process parameters of the sintering machine, and Table 3 for the sintering production efficiency and sinter quality.

[0047] Table 1 Sintering ratio of high crystal water and high manganese limonite

[0048]

[0049]Table 2 Sintering process control parameters

[0050]

[0051] Table 3 Production and quality of sintering process

[0052]

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Abstract

The invention discloses a high-proportion limonite sintering method. The high-proportion limonite sintering method includes pretreatment and sintering steps, specifically comprising: 60-70 parts by mass of high-crystal limonite, 25 Mix ~30 parts of iron-containing concentrate and 5-10 parts of iron-containing fine ore to obtain material a for later use; add 15-25 parts of flux and 5-10 parts of fuel to material a and mix to obtain material b. The material b is pelletized to obtain the material c; the material c is sintered to obtain the finished sintered ore d. The invention effectively overcomes the thin-walled large pores caused by the overflow of crystal water in the sintering process of high crystal water, increases the solvent ratio to promote the formation of liquid phase in the sintering process, and improves the strength of the bonding phase. Through strict control of process parameters, it effectively improves the The air permeability of the sinter layer is beneficial to the generation of calcium ferrite, improves the combustion efficiency, and inhibits the crystal transformation of sinter.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a high proportion limonite sintering method. Background technique [0002] In recent years, with the overcapacity of iron and steel and the intensification of market competition, iron and steel enterprises have begun to use a large amount of low-priced high-crystalline hydrolimonite for sintering production based on resource strategy and production cost considerations. However, due to the characteristics of high crystalline hydrolimonite, such as loose and porous, low bulk density, high crystal water content, large particle size, easy self-melting, strong assimilation, special sintering liquid phase, and low bonding phase strength, it can be used in high proportion and high crystallization During the sintering process of hydrolimonite, crystallization water decomposes to produce pores after heating, and at the same time, it assimilates to a high degree with calciu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 王亚力胡兴康汪勤峰葛居娜王映荣
Owner WUKUN STEEL
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