Preparation method of iron ore powder pelletized magnesian binding agent

Abstract

A preparation method of an iron ore powder pelletized magnesian binding agent comprises the following processing steps that firstly, mixed adding is carried out, wherein, according to raw material ratio, 90%-95% of sepiolite and 5%-10% of magnesia are included, and according to the mass percent of the prepared chemical components, SiO2 is smaller than 60%, MgO is larger than 18%, Al2O3 ranges from 3% to 6%, the blue absorption power ranges from 18m.mol / 100g to 20m.mol / 100g, the two-hour water absorption rate ranges from 100% to 105%, the expansion capacity ranges from 2ml / g to 3ml / g, and after raw materials are prepared, a spiral stirrer or cylindrical mixer is used for full mixing; secondly, rough breaking is carried out, wherein a hammer type breaker or jaw type breaker is used for breaking a mixture of the sepiolite and the magnesia to be particles with the granularity smaller than 3 mm; and thirdly, grinding is carried out, wherein a raymond mill or medium-speed mill is used for continuously grinding the mixture broken to the particles with the granularity smaller than 3 mm in a fine manner to -200 meshes, and the occupation is above 95%. The magnesian binding agent is used for replacing bentonite and other efficient binding agents for producing, the pelletizing performance is greatly improved, the pressure of MgO is improved while the sintered ore is reduced, stability and the improvement of the quality of the sintered ore are facilitated, and the production process is simple.

Description

technical field [0001] The invention belongs to a metallurgical method, in particular to a preparation method of iron ore powder pellet binder. Background technique [0002] With the development of the steel industry, pellets have become an important blast furnace raw material. The quality of pellets plays an important role in blast furnace production, directly determines the grade of molten iron from blast furnace, and affects iron output and fuel consumption. Compared with sinter production, pellet production has the advantages of short process, low energy consumption and less pollution. In the production of pellets, a binder must be added during the pelletizing process. At present, bentonite is basically used as a binder in the production of pellets. The advantage of bentonite is SiO 2 、Al 2 o 3 High content, good adhesion, low price; the disadvantage is SiO 2 、Al 2 o 3 If the content is too high, the grade of pellets will be reduced, and too much slag will be bro...

AI Technical Summary

Problems solved by technology

The advantage of bentonite is SiO 2 、Al 2 o 3 High content, good adhesion, low price; the disadvantage is SiO 2 、Al 2 o 3 If the content is too high, the grade of pellets will be reduced, and too much slag will be brought into the blast furnace production, which will affect the best performance of blast furnace output and fuel ratio, especially Al 2 o 3 High content will increase the viscosity of the slag, reduce the fluidity of the slag, and in severe cases, it will affect the smooth operation of the blast furnace

There are also some high-efficiency pellet binders that have appeared in recent years, which are characterized by less addition and better bonding effect, which can improve the grade of pellets and reduce the amount of blast furnace slag, but they are expensive. It is not easy to add, stir and evenly in production, so the application and promotion are limited

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