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RARE METALS, SEMICONDUCTORS
ArticleName Investigation of the process of purification of sulfuric acid vanadate solutions from manganese and other impurities
DOI 10.17580/tsm.2017.02.10
ArticleAuthor Goncharov K. V., Anisonyan K. G., Kop'jov D. Yu., Sadykhov G. B.
ArticleAuthorData

A. A. Baikov Institute of Metallurgy and Materials Science, Moscow, Russia:

K. V. Goncharov, Researcher, e-mail: goncharov-imet@mail.ru
K. G. Anisonyan, Researcher
D. Yu. Kop'jov, Researcher
G. B. Sadykhov, Head of Laboratory

Abstract

All investigations were carried out on vanadate solutions with 20–35 g/l of V2O5 and pH = 2.5, produced during the leaching of annealed vanadium slag with limestone addition. There is shown the principal possibility of obtaining of pure vanadium pentaoxide from sulfuric acid vanadate solutions due to their preliminary deep purification from manganese and other impurities by processing with ammonium carbonate. Addition of ammonium carbonate makes possible not only the vanadium binding in ammonium vanadate, but also the manganese and calcium isolation in sediment in carbonate form. There was investigated the influence of concentration of vanadate solution and process temperature on the grade of solution purification from impurities. There was described the chemism of the process of ammonium carbonate solution interaction with calcium and manganese vanadates in sulfuric acid medium. On the first stage, the solution is neutralized, which leads to the sharp growth of pH to 7 and to intensive sedimentation of manganese and calcium carbonates. On the third stage, during the increasing of ammonium carbonate consumption, the impurities' sedimentation is almost completely finished, and solution pH increases up to 8 and higher (because of ammonia excess). At the same time, vanadium is in solution in the form of ammonium vanadates. Increasing of V2O5 concentration in solution from 20 to 35 g/l leads to some worsening of the results of solution purification, because the manganese sedimentation grade is decreased up to 94.2%, and vanadium losses are increased to 2.2%. The temperature, suitable for the solution purification is in the range of 25–35 oC. Temperature increasing to 40–50 oC leads to complete sedimentation of manganese (99.3–99.99%), but, at the same time, vanadium losses are significantly increased (up to 7.5–13.4%), which, probably, is connected with the process of secondary formation of less-soluble manganesium methavanadate. The set optimal conditions allow the almost complete (>97.7%) purification of the solution from manganese. At the same time, vanadium losses with sediment are ~1.6%.
This scientific work was carried out with the support of the Russian Foundation for Basic Research No.26 16-3301124\16.

keywords Vanadium pentaoxide, vanadate solution, purification, manganese sedimentation, ammonium vanadate, ammonium carbonate
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