TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The slurry of catalyst is a sulfurized catalyst containing at least an element comprising molybdenum, iron, nickel, tungsten, cobalt, vanadium or ruthenium. The additive is inorganic oxides, spent catalysts containing at least one supported element of group VIII and/or at least one element of group VIB and/or carbon-containing solids with a low content of hydrogen. The additive has a particle size of lower than 1 mm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The roasting step is carried out at a temperature of 200-300 degrees C, preferably 225-275 degrees C in the absence of air. The pretreatment comprises at least one of: drying at a temperature of lower than 250 degrees C, preferably lower than 200 degrees C; and crushing. After the pretreatment, the particles of biomass have a moisture content of 1-50%, preferably 1-10% and a particle size of lower than 600 mu m, preferably lower than 150 pm. The hydroconversion step is performed at a temperature of 300-440 degrees C, a total pressure of 2-35 MPa, at a mass hourly velocity of 0.1-5 per hour and at a hydrogen/charge ratio of 0.1-2 Nm3/kg. The biomass is co-treated with a substance comprising oil residues, synthetic crude oils, pollarded crude oils, deasphalted oils, deasphalted resins, deasphalted asphalts, derivatives of conversion process of oil, bituminous sands or their derivatives, bituminous shales or their derivatives, coal(s) or liquid products obtained by liquefaction, hydrocarbon waste and/or industrial polymeric waste, organic waste or domestic plastic waste, plant or animal oils and fats, tar and residues not or hardly undergo beneficiation resulting from the gasification of biomass, coal, gas or oil residues, charcoal, oil of pyrolysis, and/or activated sludge. The effluent resulting from the hydroconversion step is sent to a separation section for separating gases, a heavy fraction containing the solid catalyst particles and one or more liquid fractions devoid of solids of naphtha, kerosene, gas oil and vacuum gas oil type. The liquid fraction undergoes a hydrotreatment prior to its/their recycling to the suspension. The heavy fraction containing the solid catalyst particles is recycled, partly or entirely, directly to the stage of hydroconversion. The heavy fraction containing the solid catalyst particles is recycled, partly or entirely, to the step of preparation of the catalyst of the hydroconversion step after having undergone separation and any treatment of preparation of catalytic precursors such as combustion, washing with solvent, gasification or any other technique of separation. The liquid fraction(s) devoid of solids obtained by at least a separation undergoes/undergo partly or entirely a stage of hydrotreating and/or hydrocracking via decompression. The liquid fraction(s) devoid of solids obtained by at least a separation undergoes/undergo partly or entirely a stage of hydrotreating and/or hydrocracking without decompression. The liquid fraction(s) devoid of solids and having a distillation point of 180-550 degrees C, preferably 200-550 degrees C is/are recycled, partly or entirely, as a solvent to the stage of preparation of the suspension. The liquid fraction(s) devoid of solids and exiting from the hydroconversion stage undergoes/undergo a hydrotreatment prior to its/their recycling in the suspension.