Reduction-fusion iron manufacturing process for coal-bearing pellets

A technology of coal pellets and coal pellets, which is applied in the field of coal-containing pellet reduction-smelting ironmaking, can solve the problems of reduction furnace bonding, downcomer blockage, fuel ratio and coke height, reduce bonding and pipe blockage, and improve energy utilization rate, to avoid the effect of high temperature expansion

Inactive Publication Date: 2009-07-29
姚永林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ut

Method used

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Examples

Experimental program
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Example Embodiment

[0018] This embodiment includes the following process steps:

[0019] 1. Making the ball

[0020] The iron ore powder, coal powder and binder are mixed in a certain proportion, and iron-containing briquettes are pressed by a ball press. The binder is cement, slaked lime, quicklime, water glass or organic binder, and the reducing agent is coal powder. Or coke powder, the ratio of each raw material is iron ore powder 50% to 90%, binder 3% to 30%, and reducing agent 5% to 47%. The process is now mature, with low failure rate and suitable for large-scale production. Compared with the ordinary production process of pellets, there is no need to build a huge shaft furnace, and the pellets are reliable, and it is convenient to add the reducing agent (coal powder) into the pellets as needed.

[0021] 2. The coal-containing pellets are dried and reduced by a belt-type baking reduction machine

[0022] The produced iron-containing briquettes pass through the belt and directly enter the belt ...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C21B11/00C21B13/00C21B13/02C21B13/08
Inventor 姚永林
Owner 姚永林
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