Optimization of Compressive Strength from the Combination of Sugar Cane Bagasse and Cashew Nut Shell Composite Briquettes Using D-Optimal Design

Sarafa, I., Olaoye, S.O., Olafimihan, E.O., Oladosu, K.O., Babatunde, K.A., Oladeji, J.T., Adeaga, O.A.

Abstract


This study aimed at optimizing the mixture of Cashew Nut shells (CNS) and Sugarcane Bagasse (SGB) composites briquettes using starch as binder on the compressive strength using D-optimal under the custom design of the design expert (12.0.1.0).  CNS and SCB were obtained from Olam Industry and Lafiagi Kwara State. The two biomasses were sun-dried for four days to reduce moisture content. CNS was carbonized in a furnace at a temperature 2500C for 3 hours. The two biomasses were pulverized into three different particle sizes 0.3mm 0.6 mm and 0.9mm which were mixed together by following the result generated by the design of experiment (D-optimal). A total number of 19 experimental runs from D-optimal were used to produce the briquettes of CNS and SCB composite briquette where the compressive strength of each of the briquettes were determined based on ASTMD 2166-85 standard. Run 10 (44% CNS, 19% SCB, 37% binder, Particle size 0.3 mm) gave the highest compressive strength of 1.09 MPa. The regression coefficient (R2) of the model equation obtained for the process is 0.8991, while the predicted R2   is 0.6314 which shows a reasonable agreement with the adjusted R2 (0.7982). The result of optimization indicates the mixed ratio of CNS, SCB, binder and particle size influences the compressive strength. This study shows the efficacy of using CNS, and SCB in producing composite briquettes to achieve the highest compressive strength and improve transportability and marketability of the briquettes

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