The present invention provides a producing method of a rare earth sintered magnet which is suitable as a producing method of a high performance rare earth sintered magnet which can reduce the number of steps for reusing defective molded bodies generated in a wet molding step of the rare earth sintered magnet, and which has a small content amount of oxygen. The invention also provides a slurry recycling method used for the producing method, and a slurry recycling apparatus. Each of the methods includes a crushing step of crushing, in mineral oil and/or synthetic fluid, a molded body in which slurry formed from alloy powder for a rare earth sintered magnet and mineral oil and/or synthetic fluid is wet molded in magnetic field, and recycling the crushed molded body into slurry.

The present invention provides a producing method of a rare earth sintered magnet which is suitable as a producing method of a high performance rare earth sintered magnet which can reduce the number of steps for reusing defective molded bodies generated in a wet molding step of the rare earth sintered magnet, and which has a small content amount of oxygen. The invention also provides a slurry recycling method used for the producing method, and a slurry recycling apparatus. Each of the methods includes a crushing step of crushing, in mineral oil and/or synthetic fluid, a molded body in which slurry formed from alloy powder for a rare earth sintered magnet and mineral oil and/or synthetic fluid is wet molded in magnetic field, and recycling the crushed molded body into slurry.

A defibration processing apparatus includes: an input port into which a raw material is input; a rotating body that rotates about a rotary shaft; a stationary member that covers at least part of the rotating body; and a discharge port through which a defibrated object obtained by the rotating body and the stationary member defibrating the raw material is discharged, in which the rotating body has a plurality of rotating blades protruding in a direction away from the rotation center shaft, and the stationary member has a configuration in which a screen having a plurality of openings is disposed in at least part of the stationary member in a direction of the rotation center shaft and surrounds the rotating body in a rotation direction.

A defibration processing apparatus includes: an input port into which a raw material is input; a rotating body that rotates about a rotary shaft; a stationary member that covers at least part of the rotating body; and a discharge port through which a defibrated object obtained by the rotating body and the stationary member defibrating the raw material is discharged, in which the rotating body has a plurality of rotating blades protruding in a direction away from the rotation center shaft, and the stationary member has a configuration in which a screen having a plurality of openings is disposed in at least part of the stationary member in a direction of the rotation center shaft and surrounds the rotating body in a rotation direction.

A device for dispersing a water-soluble polymer includes a primary water inlet circuit that feeds an overflow, at the bottom end of the cone, an assembly including a chamber for grinding and draining the dispersed polymer, having a rotor driven by a motor provided with knives, a stator, over all or part of the periphery of the chamber, a ring fed by a secondary water circuit, the ring communicating with the chamber by way of slots for spraying pressurized water onto the stator The slots of the stator and/or the knives of the rotor are tilted at an angle of between 20 and 80 relative to the horizontal plane of the stator and the lateral face of the blade next to the stator is curved in such a way as to make the distance separating the two components substantially constant.

A device for dispersing a water-soluble polymer includes a primary water inlet circuit that feeds an overflow, at the bottom end of the cone, an assembly including a chamber for grinding and draining the dispersed polymer, having a rotor driven by a motor provided with knives, a stator, over all or part of the periphery of the chamber, a ring fed by a secondary water circuit, the ring communicating with the chamber by way of slots for spraying pressurized water onto the stator The slots of the stator and/or the knives of the rotor are tilted at an angle of between 20 and 80 relative to the horizontal plane of the stator and the lateral face of the blade next to the stator is curved in such a way as to make the distance separating the two components substantially constant.

A portable manual grinder has a driving section, a grinding section and a discharging section coaxially connected from top to bottom. The driving section has a drive shaft that drives a central axis of the grinding section. The drive shaft is connected to a gear set that increases the gear ratio to facilitate manual grinding. The grinding section comprises an upper grinding section and a lower grinding section that are coaxially disposed and mated together. The upper and lower grinding portions include corresponding blades extending therefrom. The bottom section of the lower grinding section has one or more holes in communication with the discharge section. The driving section and the upper grinding section are magnetically attracted and connected to each other and the upper grinding section and the lower grinding section are magnetically attracted and connected to each other.

A portable manual grinder has a driving section, a grinding section and a discharging section coaxially connected from top to bottom. The driving section has a drive shaft that drives a central axis of the grinding section. The drive shaft is connected to a gear set that increases the gear ratio to facilitate manual grinding. The grinding section comprises an upper grinding section and a lower grinding section that are coaxially disposed and mated together. The upper and lower grinding portions include corresponding blades extending therefrom. The bottom section of the lower grinding section has one or more holes in communication with the discharge section. The driving section and the upper grinding section are magnetically attracted and connected to each other and the upper grinding section and the lower grinding section are magnetically attracted and connected to each other.

A rotating cutter apparatus including a housing having a housing interior surface defining a housing bore, a shaft extending through the housing bore such that an annular space is provided between the housing interior surface and the shaft, and at least one cutter carried on the shaft. The shaft is rotatable relative to the housing about a shaft axis. The at least one cutter extends radially toward the housing interior surface and is rotatable relative to the housing about the shaft axis. A method for reducing a size of solid objects contained in a fluid, including providing a rotating cutter apparatus, introducing the fluid containing the solid objects into the rotating cutter apparatus, and rotating a shaft and at least one cutter in order to reduce the size of the solid objects while passing the fluid through the rotating cutter apparatus.

A rotating cutter apparatus including a housing having a housing interior surface defining a housing bore, a shaft extending through the housing bore such that an annular space is provided between the housing interior surface and the shaft, and at least one cutter carried on the shaft. The shaft is rotatable relative to the housing about a shaft axis. The at least one cutter extends radially toward the housing interior surface and is rotatable relative to the housing about the shaft axis. A method for reducing a size of solid objects contained in a fluid, including providing a rotating cutter apparatus, introducing the fluid containing the solid objects into the rotating cutter apparatus, and rotating a shaft and at least one cutter in order to reduce the size of the solid objects while passing the fluid through the rotating cutter apparatus.