Method and device for recovering hydrogen pulverized powder of raw-material alloy for rare-earth magnet

摘要

A method and a device for recovering hydrogen pulverized powder of a raw-material alloy for rare-earth magnets capable of lowering a possibility that hydrogen pulverized powder after hydrogen was pulverized remains in a recovery chamber and capable of enhancing magnetic properties by reducing an amount of oxygen of an obtained rare-earth magnet, a processing container 50 is carried into a recovery chamber 40 from a processing chamber through a carry-in port after inert gas was introduced into the recovery chamber 40 by inert gas introducing means 12, the raw-material alloy for rare-earth magnets in the processing container 50 is discharged into the recovery chamber 40 after the pressure in the recovery chamber 40 was reduced by evacuating means 33 and thereafter, inert gas is introduced into the recovery chamber 40 by inert gas introducing means 12, and the raw-material alloy for rare-earth magnets is recovered into the recovery container 50 from an discharge port 40a after a pressure in the recovery chamber 40 was set to a predetermined pressure by inert gas.

主权项

1. A method for recovering hydrogen pulverized powder of a raw-material alloy for rare-earth magnets, comprising
a hydrogen storing step of storing hydrogen into the raw-material alloy for rare-earth magnets accommodated in a processing container, a heating step of heating the raw-material alloy for rare-earth magnets which are already pulverized by storing the hydrogen and dehydrogenating the raw-material alloy, a cooling step of cooling the heated raw-material alloy for rare-earth magnets, and a recovery step of recovering the cooled raw-material alloy for rare-earth magnets into a recovery container, wherein the recovery step is carried out in a recovery chamber which is adjacently connected to one or more processing chambers where the hydrogen storing step, the heating step and the cooling step are carried out, the recovery chamber includes:
inert gas introducing means which introduces inert gas,evacuating means which discharges gas in the recovery chamber,a carry-in port through which the processing container is carried into the recovery chamber from the processing chamber,a discharge port disposed in a lower portion of the recovery chamber, anda recovery container connected to the discharge port, wherein the recovery step comprises the steps of:
the processing container being carried into the recovery chamber from the processing chamber through the carry-in port after inert gas is introduced into the recovery chamber by the inert gas introducing means,the raw-material alloy for rare-earth magnets in the processing container being discharged into the recovery chamber after the pressure in the recovery chamber is reduced by the evacuating means,inert gas being introduced into the recovery chamber by the inert gas introducing means after the raw-material alloy for rare-earth magnets is discharged into the recovery chamber, andthe raw-material alloy for rare-earth magnets being recovered into the recovery container through the discharge port after establishing a pressure in the recovery chamber by inert gas.