In this study, recycling of the top gas of a blast furnace to its base, as a reducing agent, was investigated theoretically and some new concepts introduced. In particular, a new method for blast furnace top gas recycling using gasification of waste hydrocarbon material is suggested, and the characteristics of the system have been analyzed by thermodynamic calculation. By using coal or coke as a carbon source and blast furnace top gas as the gasification agent, a reducing gas is produced for iron ore containing 50% CO and 16% hydrogen, in the state of thermodynamic equilibrium at a temperature of 1000°C. With the ratio of effective (CO+H_2) 0.112, this gas can be injected as a reducing agent directly into the blast furnace. For confirmation of this result practically, an experimental study on the gasification of waste hydrocarbon material e.g. waste plastic, low grade coal or organic sludge, and evaluation of the effects on the blast furnace operation will follow.
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