Preparation technique of iron ore pellets

Abstract

The invention discloses a preparation technique of iron ore pellets, which comprises the following steps: (1) adding 0.5-1% of bentonite to iron concentrate, evenly mixing to obtain a mixture of which the water content is 1-3% lower than the propery pelletizing water content, pelletizing with a disk pelletizer or drum pelletizer, and when seed pellets grow into pellets with the diameters of 8mm or so, spraying fiberized bentonite in the pellet growth region to continue pelletization until qualified green pellets with the diameters of 12-16mm are obtained; and (2) the fiberized bentonite is prepared by the following steps: bentonite and a CMC (carboxymethyl cellulose) solution are mixed, so that smectite molecules in the bentonite sufficiently absorb water and expand under the actions of water molecules and CMC molecules under the action of mechanical stirring force, and spread to be compounded with the CMC molecules, thereby preparing the fiberized bentonite. The fiberized bentonite is atomized and sprayed to the pellet growth region to efficiently act on the iron concentrate granule surface and fully display the binding action, thereby obviously enhancing the quality of the green pellets and the strength of the preheated pellets and roasted pellets.

Description

technical field [0001] The invention relates to a preparation process of iron ore pellets, in particular to a method of compounding fibrous bentonite prepared by adding CMC under the mechanical force of a stirring mill, and atomizing and spraying the bentonite on the iron ore concentrate pellet growth area The pelletizing process strengthens the role of bentonite in the preparation of pellets and significantly improves the quality of green pellets, the strength of preheated pellets and roasted pellets and the preparation process of iron ore pellets. Background technique [0002] Due to its good metallurgical properties and the advantages of improving the air permeability of the blast furnace charge column, iron ore pellets are considered to be a high-quality charge necessary for the optimization of the blast furnace charge structure. Modern blast furnace ironmaking is developing towards the goals of high production, low consumption, and long life. The use and role of pellets...

AI Technical Summary

Problems solved by technology

However, there is less water in the pelletizing raw material, bentonite absorbs water, and the swelling time is short, and it is difficult for montmorillonite to fully develop and interact with iron concentrate particles, and even some coarse-grained bentonite fails to effectively absorb water and expand with montmorillonite, making it difficult to play a role

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