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Iron ore pellet iron-rich composite binder and its preparation method and use

A technology of iron ore pellets and binders, which is applied in the field of iron ore pellet binders, can solve the problems of reducing the iron grade of finished pellets, improve the quality of finished pellets, improve the performance of pellets, and reduce the total cost Effect

Active Publication Date: 2018-04-17
北京新佰奥科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of iron ore fine pellets needs to reduce the iron grade of the finished pellets and increase SiO as little as possible 2 content, but as long as bentonite is used as a binder, it will inevitably greatly reduce the iron grade of the finished pellets and increase the SiO 2 content

Method used

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  • Iron ore pellet iron-rich composite binder and its preparation method and use
  • Iron ore pellet iron-rich composite binder and its preparation method and use

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Embodiment Construction

[0024] In order to clearly understand the content of the present invention, specific examples will be used for further introduction.

[0025] According to the survey, iron slime is an industrial by-product, and the annual output is relatively large. There are 500,000 to 800,000 tons in Shandong and Shanxi provinces in my country every year, and the project price is very cheap. Since iron slime is a resource regeneration and environmental protection project, how to effectively and environmentally friendly use iron slime is of great significance to environmental protection.

[0026] The embodiment of the present invention selects a kind of iron slime, wherein iron grade is 30~40wt%, (SiO 2 +Al 2 o 3 ) content<25%, the water content is about 30wt%, and the particle size is less than 140 mesh.

[0027] The steps of preparing the iron ore pellet iron-rich composite binder by using this iron slime raw material are as follows:

[0028] Firstly, dry and finely grind the iron mud c...

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Abstract

The present invention provides an iron-rich composite binder for iron ore pellets and its preparation method and application. The iron-rich composite binder for iron ore pellets includes iron slime and a tackifier with a mass ratio of 100:1-10, wherein The tackifier is carboxymethyl cellulose, the total iron content in the iron-rich composite binder is 35-40 wt%, and the (SiO2+Al2O3) content is ≤25 wt%. The iron-rich composite binder of the present invention uses the double bonding effect of sodium silicate and tackifier in the iron mud to replace bentonite to realize the bonding effect on iron ore pellets, and can reduce (SiO2+Al2O3) content at the same time, improving The ball forming performance of iron ore powder can improve the drop strength and compressive strength of green balls, and achieve the purpose of improving the quality of finished balls. In addition, the total cost of the binder can be greatly reduced while solving the environmental protection problem of iron mud.

Description

technical field [0001] The invention relates to an iron ore pellet binder, in particular to an iron ore pellet iron-rich composite binder, which belongs to the field of metallurgy. Background technique [0002] At present, the production of iron ore powder pellets at home and abroad basically uses bentonite as the binder, and the main chemical composition of bentonite is (SiO 2 +Al 2 o 3 ). Table 1 is the chemical composition (%) of several main bentonites in my country, as can be seen from Table 1, (SiO in bentonite 2 +Al 2 o 3 ) content average reaches 83.60%, Fe 2 o 3 The average content of bentonite is 1.84%, and the content converted into total iron is only 1.29%, so the main components of bentonite are the components of blast furnace ironmaking slag. Then every 1% of bentonite added as a binder in the production process of iron fine powder pellets will reduce the iron grade of the pellets by 0.65%, and increase the SiO 2 The content of 0.65% not only causes th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
Inventor 许满兴陈海勇张玉兰王硕孙英杰
Owner 北京新佰奥科技有限公司
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