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. 29, 2019
Filed:
Oct. 04, 2017
Applicant:
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
C22B 3/22 (2006.01); C01G 49/06 (2006.01); C22B 3/00 (2006.01);
U.S. Cl.
CPC ...
C01G 49/06 (2013.01); C22B 3/22 (2013.01); C22B 23/043 (2013.01); C01P 2006/80 (2013.01); Y02P 10/212 (2015.11);
Abstract
Provided is a production method for refining iron oxide (hematite), which has such a low sulfur content as to be used as a raw material for ironmaking from a leach residue containing iron oxide, the leach residue being produced by a high pressure acid leach (HPAL) process and being a raw material that can be cheaply and stably procured. In the method of producing (high purity) hematite for ironmaking by a process of adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel, a leach residue obtained after the leaching of nickel is heated to 600° C. or more, and preferably 800° C. or more and 1400° C. or less.