Surface treatment method and device for hydrogen absorbing alloy powder
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMasashi Kodama, Motoyoshi Okumura
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Abstract
A surface treatment method for a hydrogen absorbing alloy powder of the present disclosure is used for a surface treatment on a hydrogen absorbing alloy powder containing rare earth elements and nickel as constituent elements, including an immersion process in which the hydrogen absorbing alloy powder is immersed in an aqueous alkaline solution; and a removal process in which a liquid containing the hydrogen absorbing alloy powder immersed in the aqueous alkaline solution is introduced into a liquid cyclone, and undesired substances having a smaller specific gravity than the hydrogen absorbing alloy powder adhered to the surface of the hydrogen absorbing alloy powder are removed.
Claims2
A surface treatment method for a hydrogen absorbing alloy powder containing rare earth elements and nickel as constituent elements, comprising:
- immersing the hydrogen absorbing alloy powder in an aqueous alkaline solution;
- bringing the hydrogen absorbing alloy powder into contact with an oxidant such that hydrogen is desorbed from the hydrogen absorbing alloy powder while the hydrogen absorbing alloy powder is immersed in the aqueous alkaline solution;
- and
- introducing the liquid containing the hydrogen absorbing alloy powder into a liquid cyclone such that undesired substances having a smaller specific gravity than the hydrogen absorbing alloy powder adhered to the surface of the hydrogen absorbing alloy powder are removed in the liquid cyclone, after the hydrogen absorbing alloy powder is brought into contact with the oxidant.
Dependencies are inferred from the claim text.