The study assessed the effect of sizes, mixing ratios and binders on briquettes produced from mixed sawdust and charcoalbonded with two different binders (cassava starch gel and orange waste). The two materials (charcoal and sawdust) weresieved to sizes 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm and 1 mm, using a standard test sieves in accordance with British standard.They were mixed at ratios 50:50, 60:40, 70:30, 80:20, 90:10; sawdust to charcoal and binders were at 16.6%. ASTM methodswere used to determine the briquettes proximate and ultimate analysis. Their heating value was determined using the GouthalFormula. The lowest moisture contents 3.89% was found in briquettes size 0.2 mm with ratio 50:50 using cassava starch gelwhile 6.03% was recorded for orange wastes binder at size 0.2 mm with ratio 50:50, the highest volatile matter 48.5% wasobserved at size 0.2 mm with ratio 50:50 using cassava starch binder while 40.5% was recorded for orange waste binder atsize 0.2 mm with ratio 50:50, the lowest ash contents 3.5% was at size 0.2 mm with ratio 50:50 using cassava starch binderwhile 5.5% was observed for orange waste at size 0.2 mm with ratio 50:50, the highest fixed carbon 64.55% was found at size0.2 mm with ratio 90:10 using cassava starch gel while 65.30% was found for orange waste binder at size 0.2 mm with ratio90:10, the highest heating value 3.90 KJ/g was calculated from briquettes size 0.2 mm with ratio 60:40 using cassava starchwhile for orange wastes binder was 30.03 KJ/g at size 0.2 mm with ratio 50:50.
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