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In this study, carbonized peanut shells, cashew shells and millet stalks were used as raw materials to produce coal briquettes. Clay and arabic gum were applied as binders during briquetting by use of manual press. Physicochemical and mechanical tests of the obtained briquettes were conducted. The results show that the lower heating values of coal briquettes remain higher to that of wood; however, their ash contents are very high compared to wood. Combustion of coal briquettes samples show also that coal briquettes of peanut shells, cashew shells, and millet stalks ignite respectively at 312, 202.5 and 150.5°C. Bulk densities of these briquettes are respectively 543, 765 and 579 kg/m 3. Briquette made with arabic gum presents mechanical compressive strength above 1 MPa.

In this study, charcoal fines mixed with wheat starch or arabic gum were used to produce pellets. Moisture adsorption increased greatly by increasing relative humidity. Moisture adsorption depends also on the binder type used. All charcoal pellets had compressive strength above 1.0 MPa and their moisture adsorption reached 3% to 12% depending on relative humidity conditions. In authors' experiment field, statistical analysis showed that binder type and the rate of binder had more significant effects on compressive strength. The moisture adsorption was more influenced by relative humidity and binder type.

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