Process for making iron by virtue of COREX furnace

Abstract

The invention discloses a process for making iron by virtue of a COREX furnace. The COREX furnace comprises a reduction vertical furnace, a fusion gasifying furnace and a washing tower, wherein the fusion gasifying furnace comprises a plurality of air holes and a plurality of oxygen burners, and oxygen is introduced into the fusion gasifying furnace at least through the air holes and the oxygen burners. The process comprises the following steps: (1) burning lump coals by virtue of oxygen introduced into the fusion gasifying furnace, so as to produce high-temperature coal gas; (2) collecting crushed coals obtained by sieving the lump coal, grinding and milling the crushed coals into powdered coal, and burning the powdered coal in a vault region of the fusion gasifying furnace, so as to produce high-temperature coal gas; (3) transmitting high-temperature coal gas to the reduction vertical furnace, so as to reduce iron-containing raw materials loaded into the reduction vertical furnace to be sponge iron; and (4) inputting sponge iron into the fusion gasifying furnace, and restoring sponge iron to be molten iron in the fusion gasifying furnace. By virtue of the process for making iron by virtue of the COREX furnace, the partial lump coals are replaced by virtue of powdered coal, so that the cost is saved.

Description

technical field [0001] The invention relates to the field of ironmaking technology, in particular to an ironmaking technology using a COREX furnace. Background technique [0002] In the prior art, commonly used ironmaking processes include a blast furnace ironmaking process and a COREX molten ironmaking process. Because the COREX ironmaking process has the advantages of less environmental pollution and short process, it is widely used. [0003] COREX smelting ironmaking process is a new environment-friendly ironmaking process using non-coking lump coal and partial coke as fuel and pure oxygen blasting. It is mainly composed of two parts: reduction shaft furnace and melting gasifier. Such as figure 1 As shown, the lump coal is directly added to the lower melter-gasifier 2 and burned with pure oxygen at high temperature to provide heat and generate gas. The gas produced by the melter-gasifier 2 is dedusted by the cyclone dust collector 4 and transported to the reduction shaf...

AI Technical Summary

Problems solved by technology

[0014] Due to the small swirl area of ​​the tuyere of the melter gasifier, the poor gas permeability of the material column, the difficulty of coal injection and the low injection volume, only a small part of the crushed coal produced during the transfer of lump coal can be digested.

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