# US 2014/0151944 A1 · Method of producing low oxygen-content molybdenum powder by reducing molybdenum trioxide

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- Number: US 2014/0151944 A1
- Document ID: US20140151944A1
- Status: Published application
- Kind: A1
- Application number: 14/079,615
- Filed: 2013-11-13
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Korea Institute of Geoscience and Mineral Resources
- Applicants: Korea Institute of Geoscience and Mineral Resources
- Inventors: Hyung-Seok KIM; Jung-Min Oh; Chang-Youl Suh; Back-Kyu Lee; Jae-Won Lim
- Web page: https://patentgrep.com/patent/US20140151944A1

## CPC

- B22F 9/20: starting from solid metal compounds
- B22F 9/22: using gaseous reductors
- B22F 2203/11: temperature, temperature profile
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER

## Abstract

Disclosed is an apparatus for producing low oxygen-content molybdenum powders by reducing MoO3. The apparatus includes a body, a cover to close an upper end of the body, a joint to couple the body with the cover, a bracket located in the body, and a micro-sieve located on an upper portion of the bracket. Metal Mo powders having the oxygen content of 3,000 ppm are obtained by using the apparatus for producing low oxygen-content molybdenum powders by reducing MoO3.

## Claims

### Claim 1

An apparatus for producing low oxygen-content molybdenum powders by reducing molybdenum trioxide, the apparatus comprising:
a body;
a cover to close an upper end of the body;
a joint to couple the body with the cover;
a bracket located in the body; and
a micro-sieve located on an upper portion of the bracket,
wherein, the bracket is provided in the form of a tripod.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising a heater installed at an inner lower portion of the bracket.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein a first reducing agent and the molybdenum trioxide are provided on the micro-sieve while making contact with each other.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein a second reducing agent is provided in the bracket under the micro-sieve.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein the molybdenum trioxide is reduced through a first reduction reaction performed due to direct contact between the first reducing agent provided on the micro-sieve and the molybdenum trioxide, and a second reduction reaction performed due to evaporation of the second reducing agent provided in the bracket under the micro-sieve.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the first reduction reaction of the molybdenum trioxide is performed at a temperature of 550° C. to 650° C., and the second reduction reaction of the molybdenum trioxide is performed at a temperature of 1000° C. to 1200° C.

### Claim 7 (depends on 4)

The apparatus of claim 4, wherein the first and second reducing agents comprise calcium powders, and a particle size of the calcium powders constituting the first reducing agent is different from a particle size of the calcium powders constituting the second reducing agent.