The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 2017
Filed:
Nov. 11, 2014
Applicant:
Nisshin Steel Co., Ltd., Tokyo, JP;
Inventors:
Shoichi Matsuo, Osaka, JP;
Akihiro Asaba, Osaka, JP;
Yasushi Fukui, Osaka, JP;
Masaya Yamamoto, Osaka, JP;
Assignee:
NISSHIN STEEL CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B 25/00 (2006.01); C01B 25/01 (2006.01); C04B 5/00 (2006.01); C01B 25/32 (2006.01); C04B 5/06 (2006.01);
U.S. Cl.
CPC ...
C01B 25/01 (2013.01); C01B 25/32 (2013.01); C04B 5/00 (2013.01); C04B 5/06 (2013.01); C21B 2200/00 (2013.01); C21C 2200/00 (2013.01);
Abstract
An aqueous solution containing 30 ppm or more of carbon dioxide is brought into contact with a steel-making slag to elute phosphorus and calcium contained in the steel-making slag into the aqueous solution. Subsequently, carbon dioxide is removed from the aqueous solution to precipitate a mixture comprising a phosphorus compound and a calcium compound. In this manner, a mixture comprising a phosphorus compound and a calcium compound and containing phosphorus in an amount of 1% by mass or more in terms of phosphorus atom content can be produced.