Ironmaking method capable of decreasing using amount of COREX coke

Abstract

The invention discloses an ironmaking method capable of decreasing using amount of COREX coke. The ironmaking method is characterized in that: coke with different particle sizes and different qualities is mixed and blended, and air permeability of a reduction shaft furnace and a melting gasifier is improved, so that reduction of ore introduced into the shaft furnace is facilitated, the reduction metallization ratio of reduction of the shaft furnace ore is increased, the coke using amount of the melting gasifier is decreased, air and liquid permeability of a semi-coke bed of the melting gasifier is guaranteed, the using amount of coke during the melting, reduction and production processes is decreased, and the purposes of reducing the production cost and guaranteeing the smooth progress of the melting, reduction and production processes are achieved.

Description

technical field [0001] The invention relates to the field of smelting reduction ironmaking. Specifically, the invention relates to an ironmaking method for reducing the usage of COREX coke, which saves energy, reduces consumption, reduces cost and increases efficiency. Background technique [0002] The smelting reduction ironmaking process is the only new industrialized smelting reduction ironmaking process at present. It uses non-coking coal as the main fuel and only uses a small amount of coke to produce high-quality molten iron equivalent to the blast furnace. The coking and sintering process greatly reduces the pollution to the environment, thus conforming to the strategy of sustainable development. [0003] The practice since the operation of the smelting reduction ironmaking process shows that the smelting reduction ironmaking process still needs to be improved in many aspects, and there is still a lot of room for improvement in technology. In addition, compared with t...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to address the poor air permeability of the smelting reduction shaft furnace, the shaft furnace is easy to bond, the reduction metallization rate of direct reduced iron is not high, the semi-coke bed of the melting gasifier has poor air permeability and liquid permeability, and the gas utilization rate in the smelting reduction process is low , so that the proportion of coke used is relatively high, and the cost of smelting reduction remains high. It is proposed to use coke of different qualities and different particle sizes for mixing and proportioning to increase the air permeability of the reduction shaft furnace and the melting gasifier, which is beneficial to the ore entering the shaft furnace. Reduction, and then increase the reduction metallization rate of the reduction shaft furnace ore, reduce the coke usage of the melting gasifier, ensure the air permeability and liquid permeability of the semi-coke bed of the melting gasifier, thereby reducing the coke usage in the melting reduction production process, and achieve a reduction Production cost, keep the smelting reduction production process going smoothly, and at the same time, can use a large amount of small-sized coke that cannot be used in large quantities in the blast furnace, and broaden the use of small-sized coke

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