Title

UTILIZATION OF WASTE PLASTIC MATERIAL AS REDUCING AGENT AND GASEOUS SOURCE DURING IRON REDUCTION PROCESS

UTILIZATION OF WASTE PLASTIC MATERIAL AS REDUCING AGENT AND GASEOUS SOURCE DURING IRON REDUCTION PROCESS

Authorship

Ohno, Ko-ichiro; Ueki, Yasuaki; Maeda, Takayuki; Nishioka, Koki; Shimizu, Masakata

Ohno, Ko-ichiro

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Ueki, Yasuaki

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Maeda, Takayuki

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Nishioka, Koki

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Shimizu, Masakata

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DOI

10.5151/5463-5463-0007

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Abstract

Reduction of CO2 emissions in the ironmaking process is one of emergency countermeasures against global warming. An effective use of waste plastic materials in the ironmaking process is regarded as a particularly advantageous solution. Waste materials contain huge amount of hydrogen, and the hydrogen is expected to contribute toward the reduction of iron oxide in iron ore. In this work, we conducted fundamental research on co-production of metallic iron and H2 gas from mixtures of iron oxide and waste plastic materials as follows: polyethylene, polypropylene and RDF (Refuse Derived Fuel). Mixture samples of waste plastic materials and iron oxide were heated up to 1000~1300°C in argon gas flow. Multi-component measurement of generated gases from samples and variation measurement in sample weight were carried out using the quad-pole mass spectrometer and thermo balance, respectively. The results were summarized as follows: The final fractional reductions of sample containing Refuse Derived Fuel at 1200°C were 100%. The conversion ratio of H2 by reduction of mixture samples was almost the same ratio by thermal decomposition of waste plastic materials alone. From the same figure, it was found that the conversion ratio of H2 by reduction of mixture samples reached 55~65% at 1200°C. In conclusion, the metallic iron and H2 gas were obtained by heating the mixture of waste plastic materials and iron oxide.

Reduction of CO2 emissions in the ironmaking process is one of emergency countermeasures against global warming. An effective use of waste plastic materials in the ironmaking process is regarded as a particularly advantageous solution. Waste materials contain huge amount of hydrogen, and the hydrogen is expected to contribute toward the reduction of iron oxide in iron ore. In this work, we conducted fundamental research on co-production of metallic iron and H2 gas from mixtures of iron oxide and waste plastic materials as follows: polyethylene, polypropylene and RDF (Refuse Derived Fuel). Mixture samples of waste plastic materials and iron oxide were heated up to 1000~1300°C in argon gas flow. Multi-component measurement of generated gases from samples and variation measurement in sample weight were carried out using the quad-pole mass spectrometer and thermo balance, respectively. The results were summarized as follows: The final fractional reductions of sample containing Refuse Derived Fuel at 1200°C were 100%. The conversion ratio of H2 by reduction of mixture samples was almost the same ratio by thermal decomposition of waste plastic materials alone. From the same figure, it was found that the conversion ratio of H2 by reduction of mixture samples reached 55~65% at 1200°C. In conclusion, the metallic iron and H2 gas were obtained by heating the mixture of waste plastic materials and iron oxide.

Keywords

Waste plastic materials; Ironmaking process; Co-production of metallic iron and H2 gas; quad-pole mass spectrometer

Waste plastic materials; Ironmaking process; Co-production of metallic iron and H2 gas; quad-pole mass spectrometer