Preparation method of self-fluxing composite pellets

Abstract

A preparation method for a self-fluxing composite pellet, comprising the following steps: (1) mixing coke, fat coal and quicklime until uniform to prepare a mixture A; (2) adding water to the mixture A and mixing until uniform so as to prepare a duplex grain A in a granular shape; (3) mixing a thin film raw material with an appropriate amount of water, and stirring until a liquid state is reached; (4) adhering the thin film material to the surface of the duplex grain A by employing a spraying method, and allowing same to stand so as to dry; (5) preparation of a remixing material: wrapping the duplex grain A within a thin film, and then mixing the same with fine iron ore, magnesite powder and a composite binder to prepare a remixing material, and adjusting the amount of the duplex grain A and the magnesia powder so that pellet ternary alkalinity (CaO2+MgO) / SiO2 is 0.6-1.2; (6) preparation of the pellet: placing the remixing material on a granulator for disc pelletizing or cylinder pelletizing, and allowing same to stand so as to dry, thereby forming a composite pellet; and (7) subjecting the dried composite pellet to high temperature consolidation in a reduction kiln, so as to obtain a high-temperature reduced self-fluxing composite pellet. The prepared self-fluxing composite pellet improves the metallurgical properties of pellet ores.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a preparation method of self-fluxing composite pellets. Background technique [0002] As raw materials for blast furnace ironmaking, there are three types of industrialized pellets in the world: acid oxidizing pellets, flux pellets and self-fluxing pellets. Ordinary acid pellets generally have the problem of poor reflow performance, that is, low initial softening temperature, wide softening range, and poor high-temperature reduction performance, and the metallurgical properties are lower than those of high-basic sinter. The proportion of ore can not be too high. The traditional self-melting pellets are used alone as raw materials for blast furnaces, which generally contain about 62% iron and contain CaO, MgO, SiO 2 、 Al 2 o 3 etc. Compared with the acid pellets produced by the same fine iron concentrate, the self-fluxing pellets have a higher iro...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing self-fluxing composite pellets. The self-fluxing composite pellets prepared by this method solve the problem of high energy consumption and low production capacity of traditional pellets in the production process. technical problems, improving the metallurgical properties of pellets

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