Abstract: The present invention relates to a method and facility for preparing lignocellulosic biomass, in particular by means of water extraction and optionally particle-size refinement, for subsequent use particularly in a process of torrefaction, carbonization, pellet production, such as fuel pellets or soil enhancement pellets, or the manufacturing of building materials, or even the preparation of agri-food products, comprising centrifugation (100) of the biomass followed by attrition milling and drying (200).

Abstract: The invention concerns a method for transforming a biomass into at least one biochar, comprising the following steps of: (a) Providing a ground and dried biomass, said biomass containing at least 30% of a lignocellulosic biomass, by mass relative to the dry weight of the ground and dried biomass; (b) Heating progressively this biomass to a temperature higher than 140° C. and lower than 350° C., in an oxygen-free gas stream, under a pressure comprised between 1 and 40 bar; (c) Allowing the reaction to proceed by maintaining the temperature in the 300-700° C. range and the pressure in the 1-40 bar range; (d) Cooling the biomass derived from step (c), at a temperature of at most 100° C., in an oxygen-free gas stream; and (e) Collecting the biochar. The invention also concerns the thus obtained biochar.