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Cheng X.-L.,State Key Laboratory of Advanced Steel Processes and Products | Zhang J.,State Key Laboratory of Advanced Steel Processes and Products | Yan D.-L.,State Key Laboratory of Advanced Steel Processes and Products | Qi Y.-H.,State Key Laboratory of Advanced Steel Processes and Products | Gao J.-J.,State Key Laboratory of Advanced Steel Processes and Products
Kang T'ieh/Iron and Steel | Year: 2014

A new technology by using of CO2 steel-making was proposed to prepare and heat the circulation coal-gas for oxygen blast furnace, which eradicated the issues of CO2 desorption and carbon precipitation in heating process. The effects of coal-gas as well as molten iron composition on steel-making process were discussed through computation in thermodynamics, and rational solution on processing coal-gas was proposed. The steel-making reactions in CO2 are strongly endothermic on the whole, thus, heat source needs to be provided in steel-making process. The removal limit of carbon in molten iron is below 0.02%, and removal ratio of which exceeds 99% in the temperature range of steel-making, when top coal-gas of oxygen blast furnace is used as oxidant. The capacity and composition of coal-gas modification are influenced by chemical composition of molten iron, and the content of carbon is dominant. The requirements on volume and temperature of circulation coal-gas are met through combining processes of steel-making by CO2 and pressure-swing adsorption.

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