Abstract
Rice husk as an abundant waste of biomass up to 21 million tons/year, it is unfortunate if it is not utilized. By converting it into bio briquettes, the value of rice husk bio briquettes in some studies before obtaining a relatively low value of 3,221-3,350 cal/g. The purpose of this research is to increase the calorific value of rice husk bio briquettes by mixing with coconut shell charcoal or corncob charcoal at various composition ratios of 50:50 and 80:20, to reach the optimal value that the industrial sector needed. Carbonization process was carried out at a temperature of 250-350 °C for 1.5 hours. From the results of the proximate analysis test using selected carbonization temperature at 300 °C, it can be seen that the best briquette value is made by mixing rice husk and coconut shell charcoal at composition ratio of 50:50, resulting 47.92% fixed carbon, 8.52% moisture content, 23.40% volatile matter and 20.16% ash content. The highest calorific value of 4,886 cal/g at ratio composition of 50:50, is slightly higher than the East Kalimantan coal standard of 4,828 cal/g. Hence, this bio briquettes are suitable for small scale industry application and household community use.
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