Blends of lignite with oat straw and cellulose fiber biomass and of charcoal with a 2-component binder were used sep. in various proportions of mass components (50/50, 70/30 and 80/20) to produce briquettes by using the roller press. Mech. strength of briquettes, their durability as well as unitary energy demand for their producing were detd. and then compared for changing press parameter and rotational speeds of rollers (4.25-16.96 rpm) to choose the best prodn. parameters.