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:
Jan. 17, 2012
Filed:
Jul. 11, 2008
Mitsuo Abumiya, Tokyo, JP;
Yusuke Sato, Akita, JP;
Hironobu Mikami, Akita, JP;
Masami Oouchi, Tokyo, JP;
Tetsuo Fujita, Tokyo, JP;
Masayoshi Matsumoto, Tokyo, JP;
Mitsuo Abumiya, Tokyo, JP;
Yusuke Sato, Akita, JP;
Hironobu Mikami, Akita, JP;
Masami Oouchi, Tokyo, JP;
Tetsuo Fujita, Tokyo, JP;
Masayoshi Matsumoto, Tokyo, JP;
Dowa Metals and Mining Co., Ltd., Tokyo, JP;
Abstract
To provide a method of generating, with good reproducibility and ease and without complicated operations, scorodite which satisfies the elution standard (in accordance with Notification of No. 13 of Japanese Environment Agency) and which has good filterbility and stability for processing arsenic contained in a diarsenic trioxide form. A method of processing diarsenic trioxide, including: a leaching step of adding water to diarsenic trioxide to produce slurry, heating the slurry, and leaching arsenic while adding an oxidant to obtain leachate; a deoxidization step of removing the oxidant so as to obtain an adjusted solution; and a crystallizing step of converting arsenic in the adjusted solution to scorodite crystal.