Reduction-fusion iron manufacturing process for coal-bearing pellets

Abstract

The invention discloses a reducing-melting method for making iron containing coal balls, comprising steps of mixing iron powdered ores, coal dust and binder in certain proportion, and pressing the mixture into coal balls containing iron with a ball press; baking and drying the prepared coal balls containing iron at high temperature, and then reducing to generate metal balls containing iron; thermally filling the reduced metal balls containing iron into a melting reducing furnace, at the same time, filling cokes and fusing agent, so as to reduce and melt the metal balls in the melting reducing furnace into liquid scrap iron which is discharged out from an iron port. The invention is characterized in that: ball making, drying, reducing and melting in the furnace at high temperature are integrated; as the coal balls are directly filled in the melting reducing furnace thermally, energy utilization is improved, energy consumption is reduced, the metal balls are prevented from expanding in the furnace at high temperature, only metal balls are generated during reducing period, the probability of having bonding and of plugging pipelines is greatly reduced, thus utilization rate of equipment is improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a coal-containing pellet reduction-melting ironmaking method. Background technique [0002] At present, the most mature method of ironmaking is the blast furnace ironmaking method. The molten iron produced by this method accounts for 87% of the current global pig iron production. The advantages of this method are mature technology, reliable operation, and large-scale production; the disadvantage is that it needs supporting sintering and coking, and sintering and coking not only consume a lot of energy, but also cause serious environmental pollution, and also need a lot of coke and coking coal resources. At present, there are fewer and fewer, and the price remains high. [0003] Non-blast furnace ironmaking has developed rapidly in recent years. Representatives of smelting reduction ironmaking methods include COREX, and representatives of direct reduction ironmaking methods...

AI Technical Summary

Problems solved by technology

[0004] The main problem of the COREX system is the high failure rate of equipment. The main reason is that the gasification reduction furnace uses pellets, lump ore, flux and coke, and the reduction product is sponge iron, which is easy to cause the reduction furnace to stick and produce downpipes At the same time, the fuel ratio and coke ratio are high, and it is difficult to utilize high-temperature gas

[0005] Although direct reduction methods such as MIDREX, HYL, and rotary hearth furnace have made great progress in recent years, one of the most important problems is that their products either have strict requirements on the grade of ore powder, or the products have low iron content and large amount of slag. , can not be used directly for the converter