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:
Aug. 02, 1977
Filed:
Aug. 23, 1976
Gakif Zakirovich Nasyrov, Leningrad, SU;
Izabella Vladislayovna Ravdonikas, Leningrad, SU;
Other;
Abstract
The invention relates to methods of preparing vanadium pentoxide from a vanadium-containing solution, and more particularly, from a sodium vanadate solution. The method consists in that the solution is treated at a pH of 4 to 6 with ammonium chloride or sulphate to prepare an ammonium-vandate salt precipitate which is then dissolved in hot water, and recrystallized by a mineral acid. The new precipitate of the ammonium-vanadate salt is calcined to prepare vanadium pentoxide. The advantage of the proposed method is a highly increased degree of precipitation of the ammonium-vanadate salt from the solution of sodium vanadate and a corresponding decrease of vanadium loss with wastes to at least four times.