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Sintering process of iron ore powder pellets

A technology for powder pellets and iron ore powder, which is applied in the field of sintering process of iron ore powder pellets, can solve the problems of unreasonable fuel distribution in the material layer, high energy consumption of sintered solids, poor sintered ore strength, etc., so as to improve the thermal state. Air permeability, improvement of consolidation effect, effect of improving sintered yield and strength

Active Publication Date: 2022-05-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For ordinary iron ore powder sintering solid energy consumption is high, CO 2 Large discharge, unreasonable distribution of fuel in the material bed, poor sinter strength and poor uniformity, the purpose of this invention is to provide a sintering process for iron ore powder pellets

Method used

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  • Sintering process of iron ore powder pellets

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Experimental program
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Effect test

Embodiment 1

[0075] The coarse-grained iron ore powder, limestone, dolomite, coke powder and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the specific surface area is only 1098cm 2 / g, the finely ground material is further subjected to high pressure roller grinding, and the roller grinding to a specific surface area of ​​1710cm 2 / g; then add bentonite, the amount of bentonite is 1.0% for mixing, control the coke powder with 10%, control the binary basicity (CaO / SiO 2 mass ratio) is 1.85, MgO content is 1.80, SiO 2 The content is 5.20%; the mixed material is pelletized, the pelletizing moisture is controlled to 7.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.9N / piece, a drop strength of 5.1 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 b...

Embodiment 2

[0078] The coarse-grained iron ore powder, limestone, dolomite, coke powder and returned ore are pretreated by ball milling until the particle size is less than 0.074mm, accounting for about 65%, and the specific surface area is only 1098cm 2 / g, the finely ground material is further subjected to high pressure roller grinding, and the roller grinding to a specific surface area of ​​1710cm 2 / g; then add bentonite, the amount of bentonite is 1.0% for mixing, control the coke powder with 10%, control the binary basicity (CaO / SiO 2 mass ratio) is 1.85, MgO content is 1.80, SiO 2 The content is 5.20%; the mixed material is pelletized, the pelletizing moisture is controlled to 7.5%, and the pelletizing time is 12min. The obtained green pellets have a compressive strength of 13.9N / piece, a drop strength of 5.1 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 raw...

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Abstract

The invention discloses a sintering process of iron ore powder pellets, which fully utilizes the heat storage effect of a material layer and the characteristics that the upper temperature of the material layer is low and the lower temperature of the material layer is high in the sintering process, and adopts a three-layer material distribution mode to ensure the uniformity of the temperature of the material layer, so that the fuel at the lower part of the material layer is less, the fuel at the middle part is higher and the fuel at the upper part is more; the temperature of the whole material layer is uniform. Through layered material distribution, material layer fuel is regulated and controlled to be matched with the temperature, so that the consolidation effect of sintered ore is improved, and solid energy consumption is reduced. The hydrophilic performance of the raw materials is improved through a raw material pretreatment process, and then the air permeability of the raw materials is improved through a pelletizing process; and in the sintering link, the moisture of the sintered material is reduced through the drying process, the phenomenon that the moisture is too high in the sintering process is avoided, and the thermal-state air permeability in the sintering process is improved. The dynamic conditions of mass transfer and heat transfer in the sintering process are improved, the oxidizing atmosphere in the sintering process is improved, reasonable blending of solid-phase consolidation and liquid-phase consolidation of pellet sintering is promoted, and the strength of sintered ore is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a sintering process of iron ore powder pellets. Background technique [0002] At present, the domestic blast furnace charge is mainly sintered ore, and its proportion can be as high as more than 70%, which is due to the advantages of high output of the sintering process and wide range of raw materials. However, the traditional sintering process has the problems of large environmental pollution, unreasonable fuel distribution in the material bed, high solid energy consumption (generally 45kg / t), CO 2 High emissions, low sinter strength (about 75% drum strength) and other issues. Therefore, optimization of sintering process technology is imperative. [0003] Compared with the sintering process, the carbon dioxide emission of the pelletizing process is only 20% to 45% of the sintering process, which has more advantages in terms of energy saving and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/16C22B1/00
CPCC22B1/2406C22B1/243C22B1/16C22B1/00Y02P10/20
Inventor 郭正启朱德庆潘建杨聪聪李启厚马文卓董韬
Owner CENT SOUTH UNIV
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