Method for pre-treating iron ore concentrates

An iron concentrate and pretreatment technology, applied in the field of iron and steel smelting, can solve the problems of low specific surface area of ​​iron concentrate, poor grindability and spheroidization, and high ratio of bentonite, so as to improve green pellet strength and burst temperature, reduce Addition amount, effect of enhancing surface activity

Inactive Publication Date: 2011-02-09
武钢集团有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] In the prior art, iron concentrates are usually used as raw materials to produce acid iron ore pellets, but iron concentrates have low specific surface area, poor grindability and ball forming properties. Poor ball quality, poor pellet quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] The present invention is further illustrated below by specific examples:

[0008] The iron ore concentrate is first crushed by a ball mill, and then crushed by a high-pressure roller mill.

[0009] Using ball mill and high pressure roller mill to pretreat iron concentrate can make the specific surface area of ​​iron concentrate from 500-800cm 2 / g increased to 1300-1600cm 2 / g, improve the surface hydrophilicity of iron concentrate, solve the problem of coarse particle size of iron concentrate, reduce the amount of bentonite added by 30-50%, increase the falling strength of green pellets by 50-80%, and increase the iron grade of pellets by 0.5 -0.8 percentage points, the compressive strength of pellets is increased by 40%, and the metallurgical properties of pellets are improved at the same time.

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Abstract

The invention provides a method for pre-treating iron ore concentrates, which comprises the following steps of: crushing the iron ore concentrates by adopting ball-milling and crushing the treated iron ore concentrates by adopting high-pressure roller-milling to increase the specific surface area of the iron ore concentrates to be 1,300 to 1,600 cm<2>/g. As the iron ore concentrates are pre-treated by adopting the ball-milling and the high-pressure roller milling, the method enhances the surface activity of red iron ore concentrate particles, improves the hydrophilicity of the surfaces of the iron ore concentrate particles, the pelleting performance of the concentrates, the pelleting intensity and the quality of pellet ore, reduces the volume of addition of bentonite, rises the cracking temperature and provides high-quality charging materials for blast furnace iron making.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and specifically refers to a method for pretreating iron concentrate. Background technique [0002] Iron ore pellets have the advantages of good metallurgical properties and improved air permeability of the blast furnace charge column, and are considered to be a high-quality charge necessary for optimizing the structure of the blast furnace charge, so they are used more and more in the iron and steel industry. In recent years, major iron and steel enterprises in my country are vigorously developing the pellet production process, especially the grate-rotary kiln pellet production process. [0003] In the prior art, iron concentrates are usually used as raw materials to produce acid iron ore pellets, but iron concentrates have low specific surface area, poor grindability and ball forming properties. Poor quality balls, poor quality pellets. Contents of the invention [0004] The purpose o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00B02C17/00
Inventor 舒方华黄桂香甄彩玲唐方家简传好董俊海
Owner 武钢集团有限公司
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