Method and apparatus for producing fiber pulp in a steam-pressurized grinding apparatus

Abstract From the Canadian patent

Method and apparatus for producing pulp from moisture-containing lignocellulosic material, such as wood chips which is, ground in a grinding space defined between a pair of grinding discs which rotate relative to one another in an environment of pressurized steam generated during the grinding process in a clos-, ed housing. The grist discharged from the grinding housing is propelled by the accompanying steam into a cyclone where the grist is, separated from the steam for further treatment while the steam is, recycled for further use in the pulping process. The pressure in the cyclone is so controlled that a pressure is maintained therein which is substantially equal to a pressure drop which …