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 by increasing the strength of sintered ore, improving the particle size composition of sintered ore and increasing the average particle size of sintered ore. Background technique [0002] Sintered ore refers to a lumpy charge made by mixing iron ore powder with a certain amount of solid fuel (coke powder or anthracite) and flux and sintering. The production process of sintering ore is: after the iron ore powder, flux and solid fuel are mixed and granulated by the sintering batching machine and the cylinder mixer, they are distributed on the sintering trolley through the round roller distributor, and the sintering mixture is ignited by the igniter. , Negative pressure ventilation sintering to the end of sintering, and then the sintered ore is cooled to below 100°C by the single-roller crushing at the end of the machine, a...

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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