Magnesium-iron-calcium complexing compound flux for puddling and sintering ore

Abstract

The invention relates to a magnesium-iron-calcium complexing compound flux for a puddling and sintering ore. The magnesium-iron-calcium complexing compound flux for the puddling and sintering ore is prepared from the components in percentage by mass: 0.25 percent to 0.75 percent of organic high-viscosity material, 11 percent to 13 percent of oxygenation sintering flux, and 86.25 percent to 88.75 percent of flux carrier. The organic high-viscosity material is a mixture of one or two of carboxymethylcellulose and a water soluble resin and is 0.25 percent to 0.75 percent by mass; the oxygenationsintering flux is iron oxide red (Fe2O3), has the granularity being less than or equal to 0.044mm, and is 11 percent to 13 percent by mass; and the flux carrier is a mixture of one or two of high-ironhigh-calcium refiring magnesium powder and calcite powder, and is 86.25 percent to 88.75 percent by mass. According to the magnesium-iron-calcium complexing compound flux for the puddling and sintering ore provided by the invention, more than 90 percent of sintering mixture is bonded and pelletized, so that the permeability of a sintered layer is improved, the height of the sintered layer is favorably increased, the solid fuel consumption is reduced, and low-temperature sintering is realized. The permeability of a sintered layer is improved, the sintering speed and the yield are improved, low-negative-pressure air-extracting and sintering can be adopted, the electric consumption is saved, and the energy is saved.

Description

Technical field [0001] The invention relates to the technical field of fluxes for metallurgy, in particular to a magnesium-iron-calcium complexed composite flux for ironmaking and sintering. Background technique [0002] 1. Ironmaking sinter is the main raw material for blast furnace ironmaking. Modern iron ore mining rich iron ore has become less and less, most of the lean ore that requires fine ore and grinding. The grain size of the lean ore is very fine after crushing and beneficiation. In order to meet the needs of smelting, these primary ores or fine concentrates must be agglomerated to turn them into ore with a certain size before they can be used as charge. The particle size of natural rich ore is generally 0-8mm, and the particle size of fine concentrate powder is less than 0.074mm accounting for about 40%. When part of the fine concentrate or all of the fine concentrate is used as sintering iron-containing raw materials, the sintered material layer has poor air perme...

AI Technical Summary

Problems solved by technology

The bonding performance of the formed milk of lime is very low, and the efficiency of bonding iron ore powder and other fluxes into small balls is very low, generally only reaching about 35% to 50%, and the strength of the balls is very low and brittle

[0004] 3. When part of the fine conce

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