Title

REDUCTION AND GASIFICATION BEHAVIOR OF THE COMPOSITE OF COAL AND IRON ORES CONTAINING DIFFERENT CONCENTRATION OF COMBINED WATER

REDUCTION AND GASIFICATION BEHAVIOR OF THE COMPOSITE OF COAL AND IRON ORES CONTAINING DIFFERENT CONCENTRATION OF COMBINED WATER

Authorship

Murakami, Taichi; Kasai, Eiki

Murakami, Taichi

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Kasai, Eiki

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DOI

10.5151/5463-5463-0005

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Abstract

Due to rapid increase of world steel production, steel industry is facing two difficult tusks to solve simultaneously. These are the reduction of CO2 emissions and the effective use of low-grade iron ore resources with relatively high concentration of combined water. Lowering the reduction temperature of iron oxide using a carbon-ore composite is promising ways to solve the former problem. The latter is mainly concerning to the Australian pisolite and marramamba ores. In this study, effects of particle size and the concentration of combined water on the reduction and gasification behaviors of the composite were examined. The coal/ore composite sample was heated up to 1573 K under Ar gas flow. The changes in the reduction and gasification degrees were calculated using the concentration of the generated gases. The peak of CO gas generation from the composite using pisolite and marramamba ores was obtained at about 1173 K, though there was no peak for hematite ore. Below 1373 K, the gasification degree increased with increasing the combined water concentration in the ore. It appears that the gasification reaction was accelerated by the catalytic effect of metallic iron formed by the reduction. Accordingly, the higher reduction degree was obtained below 1373 K.

Due to rapid increase of world steel production, steel industry is facing two difficult tusks to solve simultaneously. These are the reduction of CO2 emissions and the effective use of low-grade iron ore resources with relatively high concentration of combined water. Lowering the reduction temperature of iron oxide using a carbon-ore composite is promising ways to solve the former problem. The latter is mainly concerning to the Australian pisolite and marramamba ores. In this study, effects of particle size and the concentration of combined water on the reduction and gasification behaviors of the composite were examined. The coal/ore composite sample was heated up to 1573 K under Ar gas flow. The changes in the reduction and gasification degrees were calculated using the concentration of the generated gases. The peak of CO gas generation from the composite using pisolite and marramamba ores was obtained at about 1173 K, though there was no peak for hematite ore. Below 1373 K, the gasification degree increased with increasing the combined water concentration in the ore. It appears that the gasification reaction was accelerated by the catalytic effect of metallic iron formed by the reduction. Accordingly, the higher reduction degree was obtained below 1373 K.

Keywords

Reduction of CO2 emission; Iron ore resources; Coal; Reduction of iron oxide.

Reduction of CO2 emission; Iron ore resources; Coal; Reduction of iron oxide.