Novel method for sintering fine iron powder pellets

A technology of fine iron powder and a new method, which is applied in the field of iron and steel metallurgy, can solve the problems of unreasonable fuel distribution in the material layer, poor sintering gas permeability, and poor sinter strength, so as to improve high-temperature oxidation and consolidation effects, reduce coke ratio, The effect of temperature uniformity

Active Publication Date: 2022-06-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For the sintering of ordinary iron fine powder with poor gas permeability, low utilization coefficient, high solid energy consumption, CO 2 Large discharge, unreasonable distribution of fuel in the material layer, poor strength and poor uniformity of sintered ore technical problems, the purpose of this invention is to provide a new method for sintering iron fine powder pellets

Method used

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  • Novel method for sintering fine iron powder pellets

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The coarse-grained limestone, dolomite and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the finely ground material and iron fine powder are further subjected to high-pressure roller grinding to a specific surface area of ​​1710cm. 2 / g; then add bentonite, the amount of bentonite is 0.8% for mixing, and the binary basicity (CaO / SiO) is controlled. 2 mass ratio) is 1.90, MgO content is 2.0, SiO 2 The content is 5.25%; the mixed material is pelletized, the pelletizing moisture is controlled to 8.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.3N / piece, a drop strength of 5.5 times / (0.5m), and a burst temperature of 340 ℃, the particle size of the raw meal is 10-16mm, and the raw ball index meets the industrial requirements; all the obtained raw balls are rolled out of coke powder, the amount of coke powder is 3.6%, and the air permeability resista...

Embodiment 2

[0066] The coarse-grained limestone, dolomite and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the finely ground material and iron fine powder are further subjected to high-pressure roller grinding to a specific surface area of ​​1710cm. 2 / g; then add bentonite, the amount of bentonite is 0.8% for mixing, and the binary basicity (CaO / SiO) is controlled. 2 mass ratio) is 1.90, MgO content is 2.0, SiO 2 The content is 5.25%; the mixed material is pelletized, the pelletizing moisture is controlled to 8.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.3N / piece, a drop strength of 5.5 times / (0.5m), and a burst temperature of 340 ℃, the particle size of the raw meal is 10-16mm, and the raw ball index meets the industrial requirements; all the obtained raw balls are rolled out of coke powder, the amount of coke powder is 3.2%, and the air permeability resista...

Embodiment 3

[0069] The coarse-grained limestone, dolomite and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the finely ground material is further subjected to high-pressure roller grinding to a specific surface area of ​​1710cm. 2 / g; then add bentonite, the amount of bentonite is 0.8% for mixing, and the binary basicity (CaO / SiO) is controlled. 2 mass ratio) is 1.90, MgO content is 2.0, SiO 2 The content is 5.25%; the mixed material is pelletized, the pelletizing moisture is controlled to 8.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.3N / piece, a drop strength of 5.5 times / (0.5m), and a burst temperature of 340 ℃, the particle size of the raw meal is 10-16mm, and the green ball index meets the industrial requirements; all the obtained green balls are rolled out of coke powder, the amount of coke powder is 3.0%, and the air permeability resistance of the materia...

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Abstract

The invention discloses a new method for sintering fine iron powder pellets, which comprises the following steps: S1, carrying out ball milling on coarse-grained limestone, dolomite and return mine, and then carrying out high-pressure roller milling on a fine-milled material and fine iron powder to obtain a pretreated raw material; s2, proportioning the pretreated raw materials and a binder to obtain a mixture; s3, the mixed material is subjected to pelletizing; s4, the green pellets are subjected to outer rolling to obtain a solid fuel, and a uniformly mixed material is obtained; s5, performing multi-layer material distribution on the uniformly mixed material; and S6, the material layer is sequentially subjected to hot air drying, ignition sintering, heat preservation, cooling, crushing and size stabilization, and finished pellets are obtained. According to the method, the pelletizing property is improved through pretreatment of the fine iron powder, the air permeability of a material layer is improved through pre-pelletizing, and the sintering rate and yield are increased; and meanwhile, the oxygen level of a material layer is improved, the high-temperature oxidation and solidification effects are improved, and therefore the sintering ore strength and metallurgical performance are improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a new method for sintering iron fine powder pellets. Background technique [0002] Due to the advantages of high output of sintering process and wide application range of raw materials, China's blast furnace charge is mainly composed of sinter, and its proportion can be as high as 70%. The output and quality of sinter are closely related to blast furnace output and energy consumption. It is generally considered that blast furnaces produce "3 parts in operation and 7 parts in raw material". It can be seen that it is very important to ensure the output and quality of sintered ore into the furnace. Due to the restriction of raw material import, the iron and steel plants in northern my country adopt high-proportion self-produced iron ore concentrate or all-iron concentrate sintering technology in order to reduce production costs, which can reduce the dependence on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/16
CPCC22B1/242C22B1/2406C22B1/16Y02P10/20Y02P10/143
Inventor 郭正启朱德庆潘建杨聪聪李启厚龙海林
Owner CENT SOUTH UNIV
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