# US 8,784,744 B2 · Device making phosphorus by thermal process

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- Number: US 8,784,744 B2
- Document ID: US8784744B2
- Status: Granted
- Kind: B2
- Application number: 13/321,987
- Filed: 2010-05-27
- Published: 2012-05-24
- Granted: 2014-07-22
- Earliest claimed: 2009-06-25
- Assignees: China Enfi Engineering Corporation; Sichuan Chuanheng Chemical Corporation
- Applicants: Xiaomei Feng; Jin Li; Dong Li; Guangming Li; Zhenmin Zhang; Jiacai Wang; Jian Zou; Yongqiang Ma; Jun Hou
- Inventors: Xiaomei Feng; Jin Li; Dong Li; Guangming Li; Zhenmin Zhang; Jiacai Wang; Jian Zou; Yongqiang Ma; Jun Hou
- Web page: https://patentgrep.com/patent/US8784744B2

## CPC

- C01B 25/01: Treating phosphate ores or other raw phosphate materials to obtain phosphorus or phosphorus compounds
- C01B 25/02: Preparation of phosphorus
- F27B 19/04: arranged for associated working
- F27D 3/16: Introducing a fluid jet or current into the charge (F27D3/18 takes precedence)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE

## Abstract

The present invention discloses an apparatus for thermally refining phosphorus. The apparatus comprises: a melting furnace for melting rock phosphate into melts, including a feed port and a melt outlet; and a reduction-oxidation furnace including a furnace body which gas a melt inlet, a slag outlet, and a fume outlet, and a blow gun, wherein the melt inlet and the melt outlet are in communication with each other and wherein the blow gun has an end inserted into the furnace body. The content of impurities in fumes containing phosphorus pentaoxide is low, and the phosphorus pentaoxide can be easily extracted with a high purity of the phosphorus pentaoxide and at low cost by means of the apparatus for thermally refining phosphorus according to the present invention.

## Claims

### Claim 1

A apparatus for thermally refining phosphorus, comprising: a melting furnace for melting rock phosphate into melts, including a feed port and a melt outlet; and a reduction-oxidation furnace including a furnace body which has a melt inlet, a slag outlet, and a fume outlet, and a blow gun, wherein the melt inlet and the melt outlet are in communication with each other and wherein the blow gun has an end inserted into the furnace body; a projection is disposed on the outer side wall of the furnace body; a recess is disposed on the upper surface of the projection; and the melt inlet is in communication with the recess through an inclined channel.

### Claim 2 (depends on 1)

The apparatus for thermally refining phosphorus according to claim 1, wherein the blow gun comprises a top blow gun and a side blow gun, wherein the top blow gun has a lower end inserted into the furnace body from the top of the furnace body and always located above the surface of liquid slag within the furnace body, and the side blow gun has an end inserted into the furnace body from a side of the furnace body and located below the melt inlet.

### Claim 3 (depends on 2)

The apparatus for thermally refining phosphorus according to claim 2, wherein the slag outlet comprises an upper slag outlet, and a lower slag outlet located below the upper slag outlet, wherein the lower slag outlet is lower than the end of the side blow gun which is inserted into the furnace body.

### Claim 4 (depends on 2)

The apparatus for thermally refining phosphorus according to claim 2, wherein a position limiting member is disposed over the furnace body to limit a depth to which the lower end of the top blow gun is inserted into the furnace body.

### Claim 5 (depends on 1)

The apparatus for thermally refining phosphorus according to claim 1, wherein the melt inlet is located below the surface of the liquid slag within the furnace body.

### Claim 6 (depends on 1)

The apparatus for thermally refining phosphorus according to claim 1, wherein a temperature maintaining burner is disposed over the recess.

### Claim 7 (depends on 1)

The apparatus for thermally refining phosphorus according to claim 1, wherein the projection can be integrated with the furnace body.

### Claim 8 (depends on 7)

The apparatus for thermally refining phosphorus according to claim 7, wherein the projection can be formed of refractory brick to be integrated with the furnace body.

### Claim 9 (depends on 1)

The apparatus for thermally refining phosphorus according to claim 1, wherein the furnace body is provided with a ferrophosphorus outlet located below the slag outlet.

### Claim 10 (depends on 1)

The apparatus for thermally refining phosphorus according to claim 1, wherein the melt outlet and the melt inlet can be in communication with each other through a trough or a conduit.

### Claim 11 (depends on 1)

The apparatus for thermally refining phosphorus according to claim 1, wherein the melt inlet can be located beneath the melt outlet so that the melts flow directly from the melt outlet to the melt inlet.