A method of using mineral material to increase the consumption and productivity of sintered iron concentrate

Abstract

The invention discloses a method for using mineral material for increasing the consumption and productivity of sintered iron concentrate. The method comprises firstly screening returned ore and fine ore into two parts according to the particle size of 1.0-2.0mm and 4.0-5.0mm. Second, the small-sized returned ore and powdered ore are mixed with iron concentrate, iron-containing solid waste, solid fuel, flux and other ingredients for preparing sintering mixture, and then undergo a strong mixing and secondary cylinder mixing and granulation. In the process of secondary cylinder mixing and granulation, return ore with large particle size is added. Third, during the process of transporting the mixture obtained from the secondary cylinder mixing and granulation to the mixing silo for distribution, large-sized fine ore is evenly added. Finally, the segregation distribution method is used to make the mixture produce reasonable particle size segregation along the height direction of the sintering trolley, and sintered ore is formed after ignition and sintering. According to the method of the invention, the granulation effect of the sintering mixture can be improved, the gas permeability of the material layer in the sintering process can be improved, the amount of iron concentrate and the grade of the blast furnace charge can be increased, and the production technical index can be optimized.

Description

technical field [0001] The invention relates to the field of sintering in the metallurgical industry, in particular to a mineral material usage method for increasing the consumption and productivity of sintered iron concentrate. Background technique [0002] Sinter is the main charge of blast furnace ironmaking in my country, accounting for more than 70% of the iron charge into the furnace. Due to the inferior quality of iron ore powder, the main raw material for sintering, the grade of sintering ore in iron and steel plants has shown a downward trend in recent years, which has brought adverse effects on the stability and smooth operation of blast furnaces, and is not conducive to reducing the cost of blast furnace ironmaking. [0003] In order to improve the grade of sinter, some production plants began to add high-grade iron concentrate, but the sintering productivity decreased after increasing the amount of iron concentrate, so the ratio of iron concentrate in sinter prod...

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Problems solved by technology

[0006] However, the methods for increasing the amount of iron ore concentrate and sintering productivity described in the above-mentioned patents also need to increase pretreatment equipment and pelletizing facilities, and are highly targeted and have a narrow scope of application

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