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:
Nov. 13, 2018
Filed:
Jan. 30, 2015
Applicant:
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
C01G 49/00 (2006.01); C01G 49/06 (2006.01); C22B 1/16 (2006.01); C22B 3/44 (2006.01); C22B 3/00 (2006.01); C22B 3/08 (2006.01); C22B 3/22 (2006.01);
U.S. Cl.
CPC ...
C01G 49/06 (2013.01); C22B 1/16 (2013.01); C22B 3/08 (2013.01); C22B 3/22 (2013.01); C22B 3/44 (2013.01); C22B 23/043 (2013.01); C22B 23/0415 (2013.01); Y02P 10/234 (2015.11);
Abstract
There is provided a method for producing (high purity) hematite for ironmaking, in a process where a mineral acid and an oxidizing agent are added to an ore containing iron and a valuable metal and then the valuable metal is leached under high temperatures and high pressures, comprises the steps of: (1) a high pressure leach step; (2) a preliminary neutralization step; (3) a solid-liquid separation step 1; (4) a neutralization step 1; (5) a neutralization step 2; (6) a solid-liquid separation step 3; (7) seed crystal addition treatment; (8) a solid-liquid separation step 2; and (9) a firing step.