A cooling method for super-thick material layer sintered ore using pre-sintering

Abstract

The invention discloses a cooling method for super-thick material layer sintered ore adopting pre-sintering. In the pre-sintering process, the material layer thickness in the first time of distribution is 500-900 mm, the second time of distribution is carried out after pre-sintering is conducted for 8-40 min, the distribution thickness in the second time of distribution is 100-650 mm, and the total material layer thickness after the two times of distribution is higher than or equal to 900 mm. A sintered ore separating device is arranged at the tail discharging position of a belt type roasting machine, sintered ore which is higher than or equal to 500 DEG C in temperature and provided with a red fire layer and surplus sintered ore are separated into two parts, the sintered ore with the temperature lower than 500 DEG C is cooled on a ring cooling machine, and the sintered ore with the temperature higher than or equal to 500 DEG C and natural lump ore with the granularity being 10-50 mm are placed in a vertical cooling furnace to be cooled. Screening is conducted after cooling, the sintered ore with the granularity being higher than or equal to 5 mm directly enters a blast furnace to be smelted, and the sintered ore with the granularity being smaller than 5 mm returns to be sintered. By means of the cooling method, the waste heat recovery efficiency of the sintered ore is greatly improved, and the problem that the natural lump ore explodes in the blast furnace is solved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a sintering production method of iron ore, in particular to a cooling method of super-thick material layer sintered ore adopting pre-sintering. Background technique [0002] In the sintering process of the belt roaster, the sinter is usually blast-cooled by a ring cooler, and the cooled sinter is transported by the belt into the screening chamber for screening, and the screened finished sinter is transported to the blast furnace by the belt. If the cooling effect of the ring cooler is poor and the temperature of the sintered ore at the unloading place of the ring cooler is high, when it is transported by the belt, it may burn the belt, or cause a fire and cause a serious production safety accident. [0003] Especially when it is necessary to increase the output of sinter ore, thereby increasing the thickness of the material layer, and producing ultra-thick material layers, ...

AI Technical Summary

Problems solved by technology

Among them, reducing the air leakage rate is a systematic project, and there is no good solution for all enterprises. However, reducing the speed of the machine and cooling it on the machine will not only affect the ring cooling power generation, but also greatly reduce the output of sinter

If the cooling is done by increasing the ring-cooling blower, there is a certain effect, but it will greatly increase the production cost, and the gain is not worth the loss, and it is not suitable to use forced water pumping

[0004] Therefore, so far, all enterprises can only strengthen the daily technology and production management of the ring cooler, and there is no direct and effective way to improve the cooling efficiency of the ring cooler.

At the same time, the use of natural lump ore in the blast furnace can effectively reduce the production cost. Since the natural lump ore bursts at high temperature, it will affect the air permeability of the blast furnace, so the proportion of natural lump ore in the blast furnace is limited.

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