Method for producing metallized iron powder based on carbon circulation oxygen increasing direct reduction of powdery iron ore

A technology for metallizing iron powder and iron ore, applied in the field of metallurgy, can solve the problems of difficulty in industrialized utilization, low grade of iron fine powder, difficult development and utilization, etc. Reaction effect, the effect of saving raw material consumption

Active Publication Date: 2014-05-21
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to effectively enrich iron minerals by using conventional strong magnetic separation process, magnetization roasting-weak magnetic separation, flotation and other conventional processes, especially as ultra-fine low-grade high-silicon iron ore resources, due to its embedded distribution of useful minerals The particle size is extremely fine, and the properties of the original minerals are complex. It is difficult to develop and utilize the magnetic separation method, and the grade of the obtained iron concentrate is also low.
Among them, the massive refractory iron ore larger than 2mm can be processed by rotary kiln and other reduction equipment, and the powdery refractory iron ore smaller than 2mm is directly put into the rotary kiln for high-temperature reduction, which is easy to form rings and is difficult to industrialize.

Method used

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  • Method for producing metallized iron powder based on carbon circulation oxygen increasing direct reduction of powdery iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A. Selection of raw materials

[0068] The particle size of iron ore is less than 2mm, the mass of fixed carbon in blue carbon is >70%, and the particle size of blue carbon is 3-8mm; limestone is divided into powdered limestone and massive limestone. The particle size is 8 ~ 16mm;

[0069] B, grinding and magnetic separation enrichment

[0070] The iron ore is ground, and the grinding particle size is 200 mesh, and the magnetic separation enrichment makes the iron grade of the iron ore more than 40%;

[0071] C, making balls

[0072] Mix the enriched iron ore, bentonite and borax in a weight ratio of 100:2.5:0.6;

[0073] D. Grinding of mixed materials

[0074] The mixed material is poured into the grinding machine, and the grinding time is 8-10 minutes;

[0075] E. Grinding material to make balls

[0076] The grinding material is transported into the ball machine, water is sprayed on the grinding material to make it wet, and the ball machine works to roll the gri...

Embodiment 2

[0092] A. Selection of raw materials

[0093] The particle size of iron ore is less than 2mm, the mass of fixed carbon in blue carbon is >70%, and the particle size of blue carbon is 3-8mm; limestone is divided into powdered limestone and massive limestone. The particle size is 8 ~ 16mm;

[0094] B, grinding and magnetic separation enrichment

[0095] The iron ore is ground, and the grinding particle size is 200 mesh, and the magnetic separation enrichment makes the iron grade of the iron ore more than 40%;

[0096] C, making balls

[0097] The enriched iron ore, bentonite and borax are mixed and batched in a weight ratio of 100: 3.0: 0.9;

[0098] D. Grinding of mixed materials

[0099] The mixed material is poured into the grinding machine, and the grinding time is 8-10 minutes;

[0100] E. Grinding material to make balls

[0101] The grinding material is transported into the ball machine, water is sprayed on the grinding material to make it wet, and the ball machine w...

Embodiment 3

[0117] A. Selection of raw materials

[0118] The particle size of iron ore is less than 2mm, the mass of fixed carbon in blue carbon is >70%, and the particle size of blue carbon is 3-8mm; limestone is divided into powdered limestone and massive limestone. The particle size is 8 ~ 16mm;

[0119] B, grinding and magnetic separation enrichment

[0120] The iron ore is ground, and the grinding particle size is 200 mesh, and the magnetic separation enrichment makes the iron grade of the iron ore more than 40%;

[0121] C, making balls

[0122] Mix the enriched iron ore, bentonite and borax in a weight ratio of 100:2.8:0.8;

[0123] D. Grinding of mixed materials

[0124] The mixed material is poured into the grinding machine, and the grinding time is 8-10 minutes;

[0125] E. Grinding material to make balls

[0126] The grinding material is transported into the ball machine, water is sprayed on the grinding material to make it wet, and the ball machine works to roll the gri...

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Abstract

The invention relates to the technical field of metallurgy, and particularly relates to a method for producing metallized iron based on carbon circulation oxygen increasing direct reduction of powdery iron ore. According to the method, a high-silicon refractory iron ore raw material is preliminarily crushed, the selected iron ore size is 2-16 mm, the mass of fixed carbon in semi-coke is larger than 70 percent, and the semi-coke size is 3-8 mm; limestone includes powdery limestone and lumpish limestone, the size of the powdery limestone is 1-5 mm, and the size of the lumpish limestone is 8-16 mm; and control on the sizes of reactants is convenient for the production of metalized iron powder. Meanwhile, iron ore, limestone and semi-coke are formulated according to the weight ratio of 100: (10-20): (15-30), and reduction production of high-silicon refractory iron ore is carried out according to the method.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for producing metallized iron powder through direct reduction of powdered iron ore with carbon circulation and oxygen enhancement. Background technique [0002] my country is rich in iron ore resources, but more than 96% of the iron ore is lean ore, and the average iron grade of lean ore is 32.6%, while most of the lean ore is high-silicon refractory iron ore, whose iron grade is 28-35% lower, and the silicon content 20-48% higher. With the rapid development of my country's iron and steel industry, the demand for iron ore is increasing year by year. After years of mining iron ore resources, there are very few rich ore resources available for use. Poverty, the principle of first easy and then difficult. Therefore, under the circumstances that the available iron ore resources in our country tend to be poor, fine, miscellaneous and the price has risen sharply, technical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/24C21B13/08
Inventor 王明华雷鹏飞权芳民展仁礼鲁逢霖胡明田军田改霞
Owner JIUQUAN IRON & STEEL GRP
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