A kind of binder for pelletizing and preparation method of pelletizing

Abstract

The invention provides adhesive for a pellet and a preparation method of the pellet. The adhesive for the pellet comprises the following constituents in percentage by weight: 76-98% of a magnesium-containing substance, 1-10% of a calcium-containing substance, and 1-15% of vegetable albumen glue. The adhesive provided by the invention is used for preparing the pellet, the reduced expansion rate of the obtained pellet is lowered, and the quality of the pellet is effectively improved; meanwhile, the agglomerate combined with the pellet to be used is free of addition of the magnesium-containing substance, so as to greatly improve the quality of the agglomerate; furthermore, when the adhesive provided by the invention is used for preparing the pellet, the adhesive has good economic benefit and emission reduction effect. The experimental results show that the reduced expansion rate of the prepared pellet is decreased by 6%; when the adhesive is applied to a pelletizing plant with a pellet production capacity of 2,100,000 tons per year, the annual composite economic result is 5,411,000 Yuan per year, the discharge of the blast furnace slag can be decreased by 32,200 tons per year, and the emission load of CO2 can be reduced by 35,780 tons per year.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to a binder for pellets and a preparation method for pellets. Background technique [0002] Pellet ore is made of finely ground concentrate into block materials that can meet the requirements of smelting, that is, raw materials such as finely ground concentrate powder and binder are mixed according to a certain proportion, and then pelletized, dried and roasted. , cooling and other processes, and consolidate into spherical iron-containing raw materials with certain strength and metallurgical properties. High iron grade, less impurities and stable chemical composition in the pellets are beneficial to the improvement of the blast furnace comprehensive grade; the pellets have uniform particle size, good strength, and less powder, which can make the blast furnace production smoother, protect the smelting equipment, and increase productivity; It is conducive to rationally adjusting t...

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the proportion of pellets used in blast furnaces has not exceeded 30%, which is mainly due to the Fe in pellets 2 o 3 The content is high, which leads to excessive reduction expansion of the pellets in the reduction process. After a large proportion of pellets are used in the blast furnace, the furnace ore is not smooth due to the poor index of reduction expansion rate of the pellets.

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