Sintering additive and preparation method and application method thereof

Abstract

The invention relates to a sintering additive and a preparation method and application method thereof. The sintering additive comprises, by weight, 30-80 parts of magnesite, 0-30 parts of light-burned magnesia, 6-12 parts of lizardite, 4-8 parts of dolomite, 1-2 parts of magnesium sulfate, 1-2.5 parts of boron and 0.5-1.5 parts of organic binding agents. The magnesite, the light-burned magnesia, the lizardite, the dolomite, the magnesium sulfate, the boron and the organic binding agents are put into a mixer to be mixed and crushed and ground in a crushing machine until the granularity is below 200 meshes. The mixture is dried and bagged. The sintering additive has the advantages that the melting temperature of the mixture is reduced, the ignition conditions are improved, the return mine quantity is reduced, and the rate of finished products is increased; the heat transfer conditions of gas-solid-liquid phases in the sintering process are improved, so that the sintering speed is increased, the sintering time is shortened, and the production efficiency is improved; the sintering additive can have a catalytic effect on gasification combustion of solid fuel, enhance the reactivity of the fuel, enable the temperature of a combustion zone in the sintering process to be increased, facilitate mineralization reactions and generate more liquid phases.

Description

technical field [0001] The invention relates to a sintering additive, in particular to a high-efficiency and energy-saving sintering additive for iron ore sintering which can reduce sintering energy consumption. Background technique [0002] Sinter is the main raw material of blast furnaces in my country, accounting for 70% to 80% of the iron-containing raw materials in the furnace, and its quality plays a very important role in the production of blast furnaces. In the process of steel production, the energy consumption of the sintering process accounts for about 10% of the total energy consumption of steel production, second only to ironmaking, and is the second largest energy consumer in steel production. The energy consumption of the sintering process mainly includes solid fuel consumption, electricity consumption, ignition gas consumption, etc. Among them, the solid fuel consumption is the main part of the sintering energy consumption, accounting for about 75% to 80%. I...

AI Technical Summary

Problems solved by technology

At present, no less than 20 small and medium-sized iron and steel enterprises in China are using sintering strengthening agents experimentally or tentatively, but the results are uneven

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