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Iron ore pellet boron-magnesium composite binder and its application and processing method of acid pellet

A binder, boron-magnesium technology, used in the production of acid pellets from iron fine powder, and the field of iron ore pellets, boron-magnesium composite binders

Active Publication Date: 2017-11-28
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

However, experimental studies have also proved that as long as the acid pellets increase the MgO content by 1%, the roasting temperature will exceed 1300 °C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment utilizes the rich mafic ore powder resources in Liaoyang, Liaoning Province, my country, that is, the by-product (boron mud) of producing borax, which contains B 2 o 3 It is 3%, and the content of MgO is about 40%.

[0025] The MgO content required by the acid pellets of this embodiment is 1%, according to the configuration ratio relationship of the components of the iron ore pellets boron-magnesium composite binder in the iron ore pellets: " The ratio of carboxymethyl cellulose is 0.05~0.5%", to obtain the ratio relationship of the binder in this embodiment, wherein carboxymethyl cellulose is mixed into 0.2%.

[0026] The prepared iron ore pellet boron-magnesium composite binder is white powder, and its particle size -200 mesh (-0.074mm) reaches more than 95%. The silo is matched to the belt with an electronic belt scale or a screw feeder. The ratio of feeding can be set first and then adjusted until it meets the requirement of feeding ratio.

[002...

Embodiment 2

[0029] The boron-magnesium compound in this embodiment is a mixture of boric acid and supermagnesia powder.

[0030] The MgO content required by the acid pellets in this embodiment is 1.5%, and the MgO content in the selected high MgO powder is 95wt%. ratio: The ratio of carboxymethyl cellulose is 0.05% to 0.5%", to obtain the ratio relationship of the binder in this embodiment, wherein carboxymethyl cellulose is mixed with 0.15%.

[0031] The prepared iron ore pellet boron-magnesium composite binder is white powder, and its particle size -200 mesh (-0.074mm) reaches more than 95%. The silo is matched to the belt with an electronic belt scale or a screw feeder. The ratio of feeding can be set first and then adjusted until it meets the requirement of feeding ratio.

[0032] In this example, while increasing the MgO content to a level of 1.5%, the output of the blast furnace at the conventional calcination temperature was increased by 4.5% and 6.0%, respectively, and the fu...

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Abstract

The invention provides a boron-magnesium composite binder for iron ore pellets and its application and a processing method for acid pellets. The binder has two types. One is to use the abundant boron-magnesium iron ore powder resources in my country to select B2O3 The content is about 3%, and the boron magnesium iron ore powder with MgO content of 40-50% is mixed with 1%-5% carboxymethyl cellulose to form a boron-magnesium composite binder; the other is to use high MgO powder and The mixture of B2O3 is compounded with carboxymethyl cellulose to obtain iron ore pellet boron-magnesium composite binder, to achieve the same MgO content and B2O3 content as above, and to produce MgO acidic pellets. This binder can increase the MgO content of acid pellets by 1% to 2.5%, and the B2O3 content by 0.05 to 0.10%. It can be used not only as a binder for pelletizing iron fine powder, but also as an additive for the production of acid pellets to increase the MgO content. , do not increase the roasting temperature of MgO acidic pellets to achieve the purpose of producing MgO acidic pellets.

Description

technical field [0001] The invention relates to a binder for iron ore pellets, in particular to a boron-magnesium composite binder for iron ore pellets and an application thereof, which belongs to the field of metallurgy and is particularly suitable for the production of acid pellets from fine iron powder. Background technique [0002] In recent decades, my country's blast furnace ironmaking has gradually formed a charge structure with high-basicity sinter and acid pellets as the main charge structure. Acid pellets have the advantages of high grade and low slag content. However, due to the deviation of the reflow performance of the acid pellets, the air permeability and smelting effect of the lower part of the blast furnace are affected to varying degrees. Therefore, in recent years, pellet production at home and abroad is pursuing MgO acidic pellets to improve their reflow properties. [0003] Experimental studies have shown that MgO can significantly improve the reflow p...

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
Owner 北京新佰奥科技有限公司
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