Study on bio-gas and charcoal generator. (IV). Synthesis of SiC from charcoal of rice-husk.:Synthesis of SiC from Charcoal of Rice-Husk

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The charcoal of rice-husk was examined in order to evaluate the availiability of it as raw materials for SiC synthesis. The ten kinds of charcoal samples generated by the indirect pyrolysis of the compressed rice-husk at 500-1000°C are different in C/SiO2 ratio. The results are summarized as follows:(1) The powdered SiC was sintered by the atomospheric sintering method. The produced SiC has a density equivalent to 93% for the theoretical density.(2) The synthetic temperature of 1700°C for the ground charcoal is lower by 500°C than the ordinary method using the ground pitch-coke and quartz silica. It is profitable from an energy-saving viewpoint.(3) The pyrolysis conditions for the compressed rice-husk as raw materials for SiC synthesis, namely, the thermal decomposition temperature and the time required for thermal decomposition, are Td≈900°C and td, req≈10-15min, respec-tively. The rice-husk charcoal, whose C/SiO2 ratio is approximately 0.65-0.7, is generated under these conditions.
農業機械学会の論文