FIELD: wood-pulp paper industry. SUBSTANCE: proposed mixer comprises casing provided with receiving hopper and auger, shaft of which carries powder dispensing device arranged coaxially on shaft. Mixer further comprises means for withdrawing air from fibrous pulp, said means being made in form of plurality of longitudinal through-going splines extending on casing surface, disposed level with last auger turn and having width not greater than average fibre length. Besides, mixer comprises mixing chamber arranged coaxially with auger shaft at some distance from last turn of auger in such manner that powder dispensing device would be placed inside mixing chamber at its inlet. Mixing chamber has branch pipe for discharging processed fibrous pulp, and also has means for supplying chemical agent, transporting agent and/or overheated steam, said means being made in form of hollow annular chambers provided with inlet and outlet openings and disposed around powder dispensing device, in concentric relationship with auger shaft. EFFECT: proposed mixer is effective for carrying out operations of mixing, heating and transporting in wood-pulp and paper industry. 2 cl, 1 dwg
