# US 2009/0260484 A1 · Molten metal treatment, method for treating molten metal, and apparatus and method for feeding cover gas to molten metal

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- Number: US 2009/0260484 A1
- Document ID: US20090260484A1
- Status: Published application
- Kind: A1
- Application number: 12/453,684
- Filed: 2009-05-19
- Published: 2009-10-22
- Earliest claimed: 2003-02-28
- Assignees: Taiyo Nippon Sanso Corporation
- Inventors: Hiroshi Sanui; Yuji Nomura; Hidetoshi Ohta; Shoji Sekihara
- Web page: https://patentgrep.com/patent/US20090260484A1

## CPC

- C22B 9/006: {with use of an inert protective material including the use of an inert gas}
- B22D 21/007: {with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C}
- C22B 26/22: Obtaining magnesium
- Y02P 10/122: by capturing or storing CO2
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## 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.

## Claims

### Claim at position 1

-7. (canceled)

### Claim 8

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.

### Claim 9

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.

### Claim at position 4

-17. (canceled)

### Claim 18

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.

### Claim 19 (depends on 18)

The method for feeding a molten metal cover gas according to claim 18, wherein the concentration of fluorinated ketone included in the molten metal treatment is 0.1 to 20 wt %.

### Claim 20 (depends on 18)

The method for feeding a molten metal cover gas according to claim 18, wherein, when putting the molten metal treatment in the filled container in a supercritical state, temperature is 31° C. or more, and pressure is 7.38 MPa or more.

### Claim 21 (depends on 17)

The method for feeding a molten metal cover gas according to claim 17, wherein the fluorinated ketone is pentafluoroethyl-heptafluoropropylketone C3F7(CO)C2F5.