Fine reduction furnace for smelting reduction iron making

Abstract

The invention discloses a fine reduction furnace for smelting reduction iron making, comprising a slag pot, a slag pot top cover, a slag pouring port, a slag-iron screen sieve and a slagging port; the top of the slag pot is equipped with one slag pot top cover, one side of the slag pot top cover is a slag pouring port, and the other end is the slagging port; the slag-iron screen sieve is connected with the slag pot top cover, and is contacted with both sides of the slag port, the interior of the slag port is divided into a reduction reaction area and a slag storage area by the slag-iron screen sieve; after dried lump coal, semicoke or small coke block are added into the reduction reaction area, pouring slag from the slagging port, reacting FeO in slag with carbon to generate metal iron and deposit the iron at the bottom of the slag pot, and finally separating slag from molten iron. In the invention, the content of FeO in melting reduction slag is reduced to below 2.0%, and simultaneously, metal iron particles carried in slag also can be recovered to improve the use ratio of iron source.

Description

technical field [0001] The invention relates to a device for reducing FeO in molten slag for smelting reduction ironmaking process, and simultaneously precipitating and recovering metal iron particles entrained in the molten slag. The invention can also be used for the recovery of iron in converter steel slag, and is suitable for ferrous and non-ferrous metallurgical industries smelting reduction smelting. Background technique [0002] The iron and steel industry is currently facing various problems such as resources, environmental protection, and economy. Modern blast furnaces are increasingly exposing their own limitations. We need to develop non-blast furnace ironmaking technologies suitable for our country's characteristics. energy situation. The non-blast furnace ironmaking process is an inevitable trend to realize the development of high efficiency, longevity and low consumption of ironmaking due to its high utilization of resources, less environmental pollution, and ...

AI Technical Summary

Problems solved by technology

The DIOS process in Japan, the HIsmelt process and AusIron process in Australia, the AISI process in the United States, and the Romelt process in the former Soviet Union are all such methods, but these processes are due to the high content of FeO in the slag during the final reduction reaction, resulting in refractory parts of the furnace lining. Material erosion is serious, the life of the hearth is too short, and the production cost is too high due to low heat energy utilization efficiency, high consumption of mineral powder and coal, etc.

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