バイオコークスによる高周波誘導電気炉溶解における鋳鉄の加炭効果

抄録

  In order to achieve sustainable development goals (SDGs) in the casting process and become a decarbonized society by 2050, decarbonization in the manufacturing process, such as the utilization of converted biomass resources, should be promoted. Recently, recycled steel scraps that contain small amounts of carbon are increasingly being used as a cheap iron source. Since the total amount of carburizer used also increases in such applications, it is important to examine the characteristics of biomass, which is a sustainable carbon source and carbon-neutral, as a substitution for coal coke and to examine environmentally-friendly casting methods using biomass.

  Biocoke is a solid product for utilizing biomass effectively. It can be produced from herbaceous biomass. There are growing hopes that use of bamboo as a raw material can help realize domestic production of the carburizer. It has already been confirmed in the melting process using high-frequency induction melting furnace that biocoke has carburizing effects. However, the carburizing process and mechanism of biomass have not been examined.

  In this study, biocoke with different degrees of carbonization was carried out in the casting process to clarify the carburizing process. Graphitization degree was used for evaluating the carbon on the contact surface between the biocoke and molten metal. The effects of the carburizing process were reviewed based on carburizing effects and graphitization degree. The lower the degree of crystallinity of carbon in the biocoke, the faster the carbonization was carried out. It was found that carburizing occurred when the R-value, which indicates the degree of graphitization, reached around 0.8.