sawdust and other woody residues are the best material for the biomass briquette machine, because these contain a high proportion of lignin.
However, most dry agricultural residues can be used if they are ground into a coarse powder.
Grain straw and dried grasses do not make good briquettes on their own, but work well when mixed with woody materials to provide the lignin. Bagasse, shells (such as from peanuts) husks (such as rice husks and corn cobs) and pine needles make reasonable briquettes.
However rice husks are abrasive due to their silica content, and can reduce the life of machine components.
