A sintering method for ultra-thick material layer using pre-sintering

Abstract

The invention discloses an ultra thick bed sintering method adopting pre-sintering. An original belt roasting machine is additionally provided with a mixture distributing device and an igniter, and an exhausting system is adopted in the whole sintering production process. The method comprises the following steps: 1, carrying out primary distribution: paving a bottom material through a bottom material distributing device, and distributing a sintering mixture, wherein the thickness of the primary distributed material bed is 500-900 mm; 2, igniting and sintering: pre-sintering for 8-40 min; 3, secondarily distributing the sintering mixture on the surface of the primary distributed material bed to make the material distribution thickness reach 100-650 mm; and 4, igniting and sintering the obtained secondary distributed material bed under an unchanged sintering exhausting negative pressure, wherein the mixture of the primary distributed material bed is sintered when ignition of the secondary distributed material bed is completed, and the sum of the thickness of the primary distributed material bed and the thickness of the secondary distributed material bed is not lower than 900 mm; the running speed of a sintering machine in the whole sintering time is 1.5-2.5 m / min, the sintering exhausting negative pressure is not lower than 7000 pa, sintering of the primary distributed material bed and the secondary distributed material bed is completed at the tail of the sintering machine, and the whole sintering time is 20-70 min.

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 an ultra-thick material layer sintering method using pre-sintering. Background technique [0002] In iron ore sintering production, there are two main ways to directly increase the output of sintering ore. One is to increase the effective area of ​​the sintering machine to make the equipment larger; The thickness of the material layer of the machine can increase the output of sintered ore. Among them, the first method has high equipment investment cost and is suitable for new sintering plants, while the second method can increase the sinter output to a certain extent through equipment transformation at a relatively small investment cost. However, the thickness of the material layer of the sintering machine cannot be increased without limit, which is restricted by many factors such as equipment scale, exhaust fan c...

AI Technical Summary

Problems solved by technology

[0007] Restricted by the technical conditions at that time, the above studies were all aimed at improving the quality of sinter ore and reducing the consumption of solid fuel, and it was difficult to fundamentally solve the problem of sintering with an ultra-thick layer of more than 900mm.

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