Abstract: Apparatus for continuously processing wood comprises a pressurized grinding chamber, a grinding stone which is mounted for rotation in the grinding chamber, a device for feeding wood into the grinding chamber to form a primary groundwood stock therein, and a device for discharging the primary groundwood stock from the chamber without allowing gas to escape from the chamber to atmosphere. The discharging device comprises a stick crusher for crushing sticks present in the primary groundwood stock thereby to produce a secondary groundwood stock and an outlet for continuously discharging the secondary groundwood stock while preserving a hydraulic seal of groundwood stock thereby to maintain the groundwood stock in the apparatus under superatmospheric pressure.

Abstract: A method of grinding wood under pressurized conditions in a grinder according to which wood is fed in batches into a pressurized gas-filled grinding chamber provided with a rotary grinding means. The wood batches are fed through a feeding chamber provided with means for sequentially opening and pressure-tightly closing said feeding chamber from two sides in and respectively out of communication with the atmosphere and said grinding chamber respectively. The groundwood stock is discharged from the grinding chamber through a pressure lock formed by the groundwood stock. In this way feeding of the wood batches into the grinding chamber and the discharging of the groundwood stock out from said grinding chamber are carried out as sluicing steps, whereby a continuous pressure can be maintained in the grinding chamber in spite of feeding of new wood batches and discharging of groundwood stock.

Abstract: A method of discharging groundwood stock when grinding wood under pressurized conditions in a grinding chamber, according to which the groundwood is suspended into stock and collected in a tank provided with an outflow for groundwood stock to atmospheric pressure. The surface of the stock in said tank is maintained at such a level above said outflow, that the stock in said tank forms a pressure lock in the communication between the grinding chamber and said outflow. In this way the discharging of the groundwood stock out from said grinding chamber is carried out as a sluicing step, whereby a continuous pressure can be maintained in the grinding chamber in spite of discharging of groundwood stock.

Abstract: A method is provided for inhibiting the occurrence of explosions or puffs in a coal pulverizing mill by introducing a sufficient amount of water vapor into the primary air stream of a coal pulverizing system immediately prior to the introduction of coal at start-up and during stripping at shutdown.

Abstract: A device for processing rare earths with a grinding vessel having ball-shaped grinding bodies and an agitator for rotating the bodies, said vessel having a connection for the supply of liquid hexane andhaving near the bottom a tapping opening communicating with an evaporation vessel, said vessels having connections with a vacuum source and for the supply of rare gas, the evaporation vessel having an outlet for the ground product, and an outlet for the vaporlike products communicating with a condenser, the outlet of the condenser communicating through a control vessel and a hexane supply vessel with the inlet of the grinding vessel.

Abstract: A vacuum impact pulverizing mill comprising a housing, a cover sealingly closing said housing, a rotor inside said housing, motor means for driving said rotor, impact targets encompassing said rotor and fixed to said housing, conduit means for delivering granules to be comminuted to said rotor substantially along the axis thereof, means for maintaining the interior of said housing under vacuum, and means protecting the rotor against comminuted particles issuing from the targets.

Abstract: An apparatus intended for carrying out various mechanico-chemical processes for production of borohydrides and comprises an airtight shell with three compartments. The top compartment serves as a material charging chamber, whereas the middle compartment accommodates grinding solids and a vibrator rod which passes through the charging chamber and is mechanically disengaged from the shell of the apparatus, the chamber with grinding solids being suspended on the vibrator rod. The bottom compartment serves for discharge of the disintegrated products therefrom. During operation of the apparatus, reciprocating motion is imparted to the vibrator rod along and around its own axis. This results in the grinding-solid chamber being set in motion so that the material fed from the charging chamber is vigorously disintegrated.

Abstract: A vacuum food mill or blender for the cutting and mixing of food. There is provided a container associable with means for evacuating same, said container comprising a stationary lower part and a removable cover therefor. A receptacle is rotatably arranged within the container and a cutter spindle associated with suitable drive means projects into the container. Knives for cutting and mixing of the food are mounted on the spindle within the receptacle. The cover comprises two halves which are both mounted on a single hinge shaft, one thereof being pivotal with said shaft and the other thereof being pivotal with respect to said shaft. A rotatable receptacle is mounted within the container for rotation with respect thereto and the drive for same also supports said hinge shaft.