Title:
METHOD FOR DECHROMIZING HOT METAL AND METHOD FOR PRODUCING PHOSPHATE FERTILIZER RAW MATERIAL
Document Type and Number:
WIPO Patent Application WO/2019/078199
Kind Code:
A1
Abstract:
A method according to the present invention provides a hot metal having a P concentration of 1.9 to 3.8 mass% and a Cr concentration of less than 0.2 mass% by supplying an oxygen source to a hot metal having a P concentration of 2 to 4 mass% and a Cr concentration of 0.3 to 1.2 mass% for dechromization under a condition where a slag basicity (CaO mass%)/(SiO2 mass%) is adjusted to greater than 0.1 and not more than 1 and the hot metal temperature is adjusted to be within the range of 1250°C to 1500°C.
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Inventors:
SAKAMOTO MOTOHIRO (JP)
Application Number:
PCT/JP2018/038467
Publication Date:
April 25, 2019
Filing Date:
October 16, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C21C1/04; C05B5/00; C21C1/02
Foreign References:
| JP2014189427A | 2014-10-06 | |||
| JP2015038250A | 2015-02-26 | |||
| JP2016074940A | 2016-05-12 | |||
| JPS515322B1 | 1976-02-19 | |||
| JPH11158526A | 1999-06-15 | |||
| JP2009132544A | 2009-06-18 | |||
| JP5594183B2 | 2014-09-24 | |||
| JP2015189591A | 2015-11-02 | |||
| JP2016074940A | 2016-05-12 | |||
| JP2016088757A | 2016-05-23 | |||
| JPS6119361B2 | 1986-05-16 |
Other References:
See also references of EP 3699308A4
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
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