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Effect of process parameters on densification of rice husk at medium pressures

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131593871,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Mohammed Bakari, Michael Ngadi
Keywords:   Rice husk Densification Biofuel Durability Permeability FTIR-ATR Gum arabic Afzelia africana aril Parrafin wax Groundnut shell Binder Process parameters.

Abstract. Rice husk is a potential feedstock for biofuel production. However, its low density and difficulty in handling requires it to be effectively densified into briquettes or pellets. In this study, raw rice husk with geometric mean diameter of 1.669 mm and moisture content of 15% was densified at medium (42.5 to 70.8 MPa) pressures using a manual hydraulic press. Effects of process parameters including binder type, binder ratio, and die pressure; on density and water permeability of the densified rice husk were studied. The water permeability ranged from 1.40-2.27 and briquettes densities ranged from 0.39-0.78 kg/m3. FTIR-ATR, compositional analysis and proximate analysis were used to investigate the chemical and proximate characteristics of both the rice husk and the binders. The result showed that die pressure, binder type and binder ratio have significant effects on both water permeability and density of the briquettes produced. Densified rice husk bonded with paraffin wax, whole Afzelia Africa aril, and gum arabic (Acacia senegal) were found to be more hydrophobic than the ones with deoiled Afzelia africana aril and groundnut shell. However, de-oiled Afzelia africana aril produced briquettes with higher densities than the high lipid whole Afzelia africana aril.

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