Method for improving strength and size composition of sinter

Abstract

The invention discloses a method for improving the strength and the size composition of a sinter. The method is characterized in that when fluxes are added in a dosing chamber, a brucite fiber accounting for 0.90-0.95 % of the total mass of a sintered material is also added besides a calcium flux and a magnesium flux; after dosing, the brucite fiber, the calcium flux, the magnesium flux, an iron material and fuel are thoroughly mixed, and then water is added to wet the material to be subjected to a sintering process. Under the situation that the neutralized material structure, the fuel ratio and the sinter basicity remain unchanged, the brucite fiber is added, the sintering time is shortened from the original 24.2min to 21.9min, the productivity is increased by 26.6%, the sinter tumbler strength is improved by 9.15%, the average sinter size composition is improved by 2.25mm, the sinter solid fuel is decreased by 8.91kg / t, and the economic benefits are obvious, and the popularization and application values are great.

Description

Technical field [0001] The invention relates to the technical field of metallurgy, in particular to a new method for increasing production and energy saving for increasing the strength of sinter, improving the particle size composition of sinter, and increasing the average particle size of sinter. Background technique [0002] Sintered ore refers to a block charge made by mixing iron ore powder into a certain amount of solid fuel (coke powder or anthracite) and flux, and then sintering. The production process of sintered ore is as follows: the iron ore powder, flux and solid fuel are sintered and mixed thoroughly and granulated by a cylinder mixer, then distributed on the sintering trolley through a round roller distributor, and the sintered mixture is ignited by an igniter , Negative pressure suction sintering to the end of sintering, and then the sintered ore is cooled to below 100℃ by the single-roller crushing at the end of the machine, and the belt cooler is used to cool the...

AI Technical Summary

Problems solved by technology

The sinter produced in the sintering area is transported to the blast furnace through repeated transportation, not only the proportion of the particle size less than 5mm has increased, but also the proportion of the 5-10mm particle size has increased significantly; coupled with the current sinter screening equipment under the blast furnace tank They are all rod sieves. After being screened by the rod sieve, the powder return rate under the blast furnace tank will increase, which will not only increase the shipping cost, but also cause a waste of sintering energy.

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