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. 18, 2025
Filed:
Oct. 23, 2019
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Hitoshi Ishida, Niihama, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
Provided is a production method and a production apparatus that increase a throughput of nickel sulfate per equipment. A first dissolution step I of introducing a nickel briquette, sulfuric acid, and water to a leaching tank () and dissolving the nickel briquette to obtain a primary nickel sulfate solution, and a second dissolution step II of introducing the primary nickel sulfate solution and additionally introducing a nickel briquette to a leaching adjustment tank () and dissolving the additionally introduced nickel briquette with free sulfuric acid in the primary nickel sulfate solution to obtain a nickel sulfate solution are executed in this order. With the leaching adjustment tank () having a role as a concentration adjustment tank that increases a nickel concentration and decreases a free sulfuric acid concentration, and the leaching tank () supplied with the sulfuric acid and the water in addition to the nickel briquette, a continuous dissolution is achievable without increasing a retention time and without unnecessarily enlarging the equipment.