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Preparation method of refractory ball carbon-containing iron-containing dust pellets and its application in composite agglomeration process of iron ore powder

A dust and pelletizing technology, which is applied in the field of iron and steel metallurgy high-quality blast furnace charge preparation and iron-containing dust solid waste treatment, can solve the problems of low green pellet strength and large amount of binder, so as to improve the green pellet strength and reduce The amount of binder used and the effect of reducing the amount of binder

Active Publication Date: 2017-09-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of large amount of binder and low strength of green pellets existing in the current pelletizing process of refractory iron-containing dust materials, the purpose of the present invention is to provide a method for preparing refractory pellets containing carbon-containing iron-containing dust into high-strength pellets. The method of pelletizing, which can significantly improve the quality of green pellets and reduce the amount of binder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]The sinter dust, blast furnace ash, electric furnace ash, raw material field ash, finished product ash, mine tank ash, and converter ash are mixed according to the mass ratio of 15:20:5:30:15:10:5, so that the mixture The fixed carbon percentage in the mixture accounts for 7.0% of the dry basis mass of the mixture, and then the high-pressure roller mills until the -200 mesh particle size accounts for 95% of the mass percentage and the specific surface area is 2500cm 2 / g, then add 1.5% humic acid modified bentonite binder (preparation conditions: the dry mass ratio of sodium humate to calcium-based bentonite is 1:10, dimethyl dioctadecyl ammonium chloride and The mass ratio of calcium-based bentonite on a dry basis is 2:100; the moisture content of the resulting mixture is controlled at 30%, and the mixture of bentonite and sodium humate is compacted under a pressure of 25MPa; the mixture is aged for 10 days at room temperature, and then aged at 80 ℃; then crushed and gr...

Embodiment 2

[0028] The sintering dust, electric furnace ash, finished product ash, mine tank ash, and converter ash are mixed according to the mass ratio of 20:30:15:15:20, so that the fixed carbon content in the mixture accounts for the dry weight of the mixture 1.0%, and then high-pressure roller milled to -200 mesh particle size accounted for 100% by mass, specific surface area of ​​2600cm 2 / g, then add 1.0% humic acid modified bentonite binder (preparation conditions: the dry basis mass ratio of sodium humate to calcium-based bentonite is 3:10, trimethyl octadecyl ammonium chloride and calcium The mass ratio of bentonite to dry basis is 5:100; the moisture content of the obtained mixture is controlled at 50%, and the mixture of bentonite and sodium humate is compacted under a pressure of 15MPa; the mixture is aged at room temperature for 5 days, and then placed at 80°C Drying at high temperature; then crushing and grinding to -200 mesh (accounting for 100%), pelletizing after vigorou...

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Abstract

The invention discloses a preparation method of a difficult-to-make ball carbon-containing iron-containing dust pellet material and its application in the iron ore powder composite agglomeration process; Humic acid-modified bentonite is subjected to moist grinding or strong mixing, and then pelletized to obtain carbon-containing and iron-containing dust pellets; this method can make carbon-containing and iron-containing dust that is difficult to pellet into balls with high falling and compressive strength Agglomerates meet the requirements of the iron ore powder composite agglomeration process for the strength of dust green pellets; when the agglomerates are used in the iron ore powder composite agglomeration process, the ratio of iron-containing dust pellets can be significantly increased, and the composite The quality index of agglomerate products realizes efficient, reasonable and large-scale utilization of carbon-containing and iron-containing dust, achieves the purpose of saving secondary resources and protecting the environment, and meets the requirements of industrial production.

Description

technical field [0001] The invention relates to a preparation method of a carbon-containing iron-containing dust pellet material and an application of the pellet material in an iron ore powder composite agglomeration process, belonging to the fields of iron and steel metallurgy high-quality blast furnace charge preparation and iron-containing dust solid waste treatment. Background technique [0002] Iron-containing dust produced by iron and steel complexes has high comprehensive utilization value, and usually contains high Fe, CaO, MgO and fixed carbon and other beneficial components. These dusts are mainly produced in processes such as sintering, coking, ironmaking, steelmaking and steel rolling, and mainly include miscellaneous ore powder, sintering dust, blast furnace dust, gas ash, electric furnace dust and converter dust generated during raw material processing. According to statistics, in the first half of 2014, my country's crude steel output reached 820 million tons....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/248
Inventor 张元波姜涛李光辉范晓慧刘兵兵刘臣余正伟苏子键彭志伟黄柱成郭宇峰杨永斌李骞陈许玲许斌甘敏陈祝印陈迎明杜明辉孙阳
Owner CENT SOUTH UNIV
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