Molten metal treatment, method for treating molten metal, and apparatus and method for feeding cover gas to molten metal
AssigneeTaiyo Nippon Sanso Corporation
InventorsHiroshi Sanui, Yuji Nomura, Hidetoshi Ohta, Shoji Sekihara
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Abstract
A molten metal treatment consisting of a liquid mixture in which fluorinated ketone is dissolved in liquid carbon dioxide at 0.01 to 10 wt % is put in a container, and the molten metal treatment is vaporized, and is fed as a cover gas to be contacted with the surface of a molten metal.
Claims8
-7. (canceled)
A method for treating a molten metal comprising the steps of vaporizing a molten metal treatment consisting of a liquid mixture having fluorinated ketone dissolved in a liquid carbon dioxide at 0.01 to 10 wt %, and feeding the same as a cover gas brought into contact with the surface of the molten metal.
A method for treating a molten metal comprising the steps of:
- making a molten metal treatment, which is composed of a liquid mixture in which fluorinated ketone is dissolved in a liquid carbon dioxide at 0.01 to 10 wt %, into misted by using spraying means;
- simultaneously vaporizing a liquid carbon dioxide, and feeding the misty fluorinated ketone as a cover gas brought into contact with the surface of a molten metal, using the carbon dioxide as a spraying propellant.
-17. (canceled)
A method for feeding a molten metal cover gas to a molten metal, comprising the steps of:
- putting carbon dioxide of a molten metal treatment consisting of a liquid mixture including a liquid carbon dioxide and fluorinated ketone into a supercritical state in a filled container;
- thereafter taking out the molten metal treatment from the filled container and mixing the same with a base gas;
- and
- feeding a thereby the obtained cover gas to the molten metal.
The method for feeding a molten metal cover gas according to claim 17, wherein the fluorinated ketone is pentafluoroethyl-heptafluoropropylketone C3F7(CO)C2F5.
Dependencies are inferred from the claim text.