Study on Reduction Method of Carbon-Dioxide Gas Generation Using Wastes in Iron-Making process

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This study aimed to propose the method of reduction of carbon-dioxide gas generation in iron and steel making processes using wastes instead of coals and to contribute the suppression of global warming. The studies achieved are as follows ;1. Production of reduced iron1.1 Gasification of wastes and reduced iron production by reducing gasThe reducing method to put the iron are into the reducing gas made by wastes was proposed. The model of reduction reaction was proposed and the reduction experiments to obtain the suitable reduction conditions were carried out. The data showed that reduction actually occurred, but the reaction rate was very small.1.2 Reduction experiments using pellets of wastes and iron are mixturesIn order to increase productivity of reduced iron, pellets of crashed wastes and iron are mixtures were examined. The experiments revealed that the best conditions for reduction were mixing ratio of iron are of about 50% and heating temperature of around 1400℃. The effect of grain size distribution was not so important. Chemical and EPMA analysis was carried out to evaluate the quality of the reduced iron, and the data showed that the iron had the metallic Fe content of 95% and was reduced uniformly in it.Plastics and food wastes were also investigated for reducing agents. The plastic was vaporized in high temperature and it was impossible to reduce iron ore. On the other hand, the food wastes were found a good reducing agent.2 Amount of wastes in Japan and CanadaIn Japan wastes of woods, tires and plastics were generated 21 million tons, 200 thousand tons and 10 million tons every year. In Canada 25% of wastes in Japan was generated every year. However, the cost of collecting the wastes in Canada is too high to use them effectively.