Carburizing materials (Carburizer) are used in the process of manufacturing cast iron. Types of Carburizers include electrode graphite and coke, and Japan is dependent on imports from overseas. Since Carburizer are derived from fossil resources, reducing the amount of Carburizer used is an issue. Since biomass is a resource of natural origin, the carbon neutral theory holds. In particular, the effective use of waste-based biomass will lead to a reduction in waste. In recent years, coffee grounds have been discarded at convenience stores because coffee is brewed from beans. Efforts are being made to reuse paper, but there are only a few and most companies dispose of it. The results of previous experiments suggest that biocoke produced from woody and herbaceous biomass has the potential to be an alternative as a carburizing material. However, woody biomass is expensive to collect. As a result, we thought that we could solve the three points of safe suppl y of energy, environmental safety, and economic effects at the same time, and that we could manufacture cast iron in an environmentally friendly manner. In this study, biocoke was used as a carburizing material during cast iron production, and pig iron less casting was performed in a high frequency induction melting furnace. At that time, we investigated the substitution of coffee grounds as a carburizing material by using a mixture of coffee grounds and wood-based biocoke and investigating the effect on the amount of carburization and mechanical properties. As a result, it was found that substituting 100% cedar bio-coke with coffee grounds for 30% did not affect the mechanical properties, and good cast iron castings could be produced.

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 The use of carbon-neutral resources is required to build a fossil-free and decarbonized society. Biomass is not suitable for transportation due to its small specific gravity. Moreover, biomass is widely and thinly distributed throughout the country, and local production for local consumption is desirable. Therefore, it is important to understand and utilize the amount of resources at the regional level, such as prefectures and municipalities in utilizing forest biomass resources. GIS has been used to determine the amount of forest biomass resources at the regional level, and the abundance is estimated for woody biomass such as cedar and cypress. In this study, biomass resource estimation was conducted for fast-growing bamboo. In addition, we focused on the amount of biomass that could be gathered. This is because bamboo needs to be gathered and transported as well as cut down in order to be used as a resource. Therefore, calculations were limited to low-cost, collectible installations that were assumed

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