Method for recovering NdFeB waste material by cold crucible induction smelting technology

Method for recovering NdFeB waste material by cold crucible induction smelting technology

  • CN 102,492,848 A
  • Filed: 12/22/2011
  • Published: 06/13/2012
  • Est. Priority Date: 12/22/2011
  • Status: Active Grant
First Claim
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1. the method with cold crucible Induction Melting Technology recovery NdFeB waste material is characterized in that it comprises the steps:

  • Step 1;

    pretreatment procedure;

    with artificial tangible foreign matter in the NdFeB waste material is sorted away earlier;

    Clean the greasy dirt of scraped surface again with kerosene;

    Then waste material is broken into the particle of granularity less than 3mm, in magnetic separator, selects the foreign material of nonferromagnetic, will pass through the drying materials of magnetic separation at last;

    Step 2;

    thick purification process;

    heating NdFeB waste material in cold crucible vacuum induction melting equipment;

    Add the high-power feed liquid that makes after the fusing and seethe, remove volatile impurity, reduce power then and make the impurity slag float to the surface of feed liquid;

    Remove the pipe close of upflow tube;

    Make the surface current of feed liquid go out water jacketed copper crucible, get in the lateral waste liquid tank of water jacketed copper crucible, spur the pull bar of water jacketed copper crucible below then downwards;

    Make the crucible plug that is connected on the pull bar to the bottom that drops to mould, make through thick feed liquid of purifying and inject mould;

    Step 3;

    smart purification process;

    utilize the cold crucible apparatus for directional solidification, make through thick material of purifying and in the piped water jacketed copper crucible, melt, the pull bar that utilizes water-cooled then makes feed liquid shift out the high-temperature zone downwards and solidifies at the bottom of the crucible of drop-down water-cooled;

    In the feed liquid process of setting, be dissolved in originally partition ratio in the metal less than 1 impurity atoms just from the exclusion of coagulation phase to feed liquid, coagulation phase has just obtained purification;

    Continue to add the thick material of purifying to water jacketed copper crucible along with continuing at the bottom of the crucible to move down with feeder, the quantity of the charge bar of smart purification after coagulation constantly increases.

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