Reducing chamber and heating chamber multilayer obturation alternation and fusion gasification combination metal smelting method

Abstract

The invention provides a novel metal oxide smelting method, namely, reduction chamber and heating chamber multi-layer sealing space and melting gasification combined smelting method, which aims to solve the problems that coking coal and high-quality iron ore are lacked in blast furnaces and problems existing in various non blast furnaces smelting method. The method is mainly used in smelting iron, which does not need procedures such as coke and sintering and palletizing and the like which pollute, and can smelt powder ore and fine ore, and can use cheap coal and other fuel, and can use cheap iron ore with high harmful element content. The cost to manufacture the invention is evidently lower than the current blast furnaces and non blast furnaces smelting method. The method of smelting metal oxide is divided into two procedures, the first is directly reducing and the second is melting gasification.

Description

Technical field [0001] The invention relates to a new technology for the reduction of iron and other metal oxides, which is applied in the field of metal smelting, especially iron smelting. Background technique [0002] At present, there are mainly two methods of smelting metallic iron from iron ore as raw materials: blast furnace smelting and non-blast furnace smelting: [0003] 1. Blast furnace ironmaking method [0004] Blast furnace is a gas-solid-liquid countercurrent reduction reaction device, which can directly generate molten liquid iron. Since gas-solid-liquid countercurrent requires strict gas permeability requirements for raw materials, coking and sintering are required as raw materials to form agglomerates and improve metallurgical properties. Good fluidity of the slag is required. The blast furnace ironmaking method is currently the most widely used ironmaking method with the largest monomer scale, the highest labor production efficiency, the lowest cost, and ...

AI Technical Summary

Problems solved by technology

The blast furnace ironmaking method is currently the most widely used ironmaking method with the largest monomer scale, the highest labor production efficiency, the lowest cost, and the most mature technology, but it also encounters the following unsolvable problems: environmental pollution caused by the coke oven and sintering process Seriously, the social environmental protection pressure of enterprises using blast furnaces continues to increase. Insufficient coking coal resources lead to rising coke prices. The gradual shortage of high-quality iron ore resources leads to an increase in the use of ores with high alumina content that is not conducive to the fluidity of slag. And lead to a decline in various economic and technical indicators

The Hismelt method uses the high-speed "iron bath reduction" method to successfully avoid the formation of ferrous oxide and enter the slag, and protect the furnace lining, but uses the secondary combustion of the upper part of the furnace molten iron to generate heat, and conducts heat through the gas-liquid interface. It is more difficult. Although the "fountain" phenomenon is used to increase the contact area and the heat transfer rate inside the melt, it is necessary to blow in oxygen-enriched hot air as high as 1200°C from above to make the combustion temperature as high as 2000°C. The need for melt reduction and melting heat leads to the use of forced water cooling and slag splashing on the upper part of the furnace to protect the furnace

The Hismelt method also has many problems such as large investment, low silicon-free carbon content, not suitable for steelmaking, short furnace lining life, small scale of single equipment, and low calorific value of gas, which is difficult to use.

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