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:
May. 30, 2006
Filed:
Feb. 27, 2002
Akira Sakuma, Ibaraki-ken, JP;
Akira Sakuma, Ibaraki-ken, JP;
Kashima-Kita, Electric Power Corporation, Ibaraki-ken, JP;
Abstract
There is disclosed a wet-processing method for combustion ashes of petroleum fuels, comprising a slurry preparation step of preparing a slurry of the combustion ashes; a metal oxidation step of preparing a slurry containing ammonium metavanadate; a solid/liquid separation step of removing solids from the slurry containing ammonium metavanadate; a double decomposition step for ammonium sulfate, of adding a magnesium compound to an aqueous ammonium sulfate solution recovered from the solid/liquid separation step; and an ammonia recovery step of recovering ammonia from a reaction solution recovered from the double decomposition step. The above metal oxidation step is conducted while controlling an ammonium sulfate concentration of the aqueous solution to 20 to 45% by weight and the temperature of the aqueous solution to not more than 50° C., and the above solid/liquid separation step is conducted using a specific solid/liquid separator while controlling the temperature of the slurry to not more than 40° C. The above wet-processing method is an industrially useful and simple process capable of readily recovering vanadium from combustion ashes which is suitably used, in particular, in such a case where the amount of combustion ashes to be treated is relatively small or where the combustion ashes have a less carbon content and a high vanadium content.