A kind of method and device of multi-layer slag smelting reduction ironmaking

Abstract

The invention belongs to the field of ironmaking, and relates to a method and device for ironmaking by smelting reduction of multi-layer slag. The method is carried out in a vertical smelting furnace, and a mixture of combustion-supporting gas, mineral powder + flux, combustion-supporting gas, fuel and The combustion-supporting gas is respectively fluidly connected to the upper spray gun (1), the middle spray gun (2) and the lower spray gun (3) arranged on the upper, middle and lower parts of the vertical melting furnace; the three spray guns spray the prepared materials into the vertical melting furnace at the same time. In the smelting furnace, molten iron and slag are formed by reaction, and the molten slag layer (6), the reduced slag layer (7), the static slag layer (8), the molten iron layer (9) and the dead slag layer are formed from top to bottom in the furnace. Iron layer (10); iron or slag is tapped through the iron / slag outlet (4) arranged at the molten iron layer (9) at the lower part of the furnace body. The invention is a high-efficiency, energy-saving and low-cost one-step smelting reduction ironmaking method, and the device design is simple and easy to realize.

Description

technical field [0001] The invention belongs to the field of ironmaking, in particular to a method and device for smelting reduction ironmaking. Background technique [0002] The ironmaking technology in the metallurgical industry has long been based on the long process of blast furnace smelting, that is, the ore powder must first be sintered or pelletized into blocks, and then enter the blast furnace after it has a certain strength. At the same time, the fuel in the blast furnace smelting process is mainly Coke, which determines the shortcomings of the blast furnace ironmaking process, such as long process, high energy consumption, heavy pollution, and large investment. [0003] Aiming at the problems of traditional blast furnaces, the majority of metallurgists have been looking for a non-blast furnace ironmaking process with a short process, less coke or no coke. There have been industrialized processes such as COREX and FINEX. However, COREX is The original blast furnace...

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Problems solved by technology

[0002] The ironmaking technology in the metallurgical industry has long been based on the long process of blast furnace smelting, that is, the ore powder must first be sintered or pelletized into blocks, and then enter the blast furnace after it has a certain strength. At the same time, the fuel in the blast furnace smelting process is mainly Coke, which determines the shortcomings of blast furnace ironmaking process, such as long process, high energy consumption, heavy pollution, and large investment

[0003] Aiming at the problems of traditional blast furnaces, the majority of metallurgists have been looking for a non-blast furnace ironmaking process with a short process, less coke or no coke. There have been industrialized processes such as COREX and FINEX. However, COREX is The original blast furnace process is divided into two stages of reduction and melting. Although the coke consumption is reduced, the coal consumption is increased, and the overall energy consumption is higher than that of the blast furnace. The FINEX process is also carried out in two stages of multi-stage reduction and melting. Among them, the reduction The final ore powder still needs to be compacted to enter the melter gasifier, and a small amount of coke or coking coal is also required in the smelting process

The one-step smelting reduction method that is only in the experimental stage also includes DIOS in Japan, AISI in the United States, HIsmelt in Australia and Romelt in Russia, etc. Although these processes all carry out reduction and melting of fine ore in a furnace, there are some The slag powder falls from the top, and some are sprayed into the slag. At the same time, all the combustion-supporting gases are blown from the top. However, during the test of these processes, there are serious refractory burning losses, high energy consumption, and unsmooth processes. line and other issues, therefore, has not yet achieved industrialization

[0004] In short, in the current non-blast furnace process, there are still many unresolved problems in the one-step smelting method, such as the low utilization efficiency of CO gas generated during the smelting process, which is burned at the top of the furnace, or incompletely burned

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