Method for production of vanadium pentoxide

This is an English translation of a Czechoslavakian patent which describes an invention for the production of vanadium pentoxide. The principle of the invention can be described as follows: inlet recirculated water is filtered using at least two layers of the base anion exchangers arranged in series, received reciprocating recirculated water free of chromium, but containing the initial amount of vanadium, is returned to the circuit of production of vanadium pentoxide. After the first layer of the base anion exchanger is saturated with chromium, the inlet recirculated water is fed to the second layer of the base anion exchanger. In the meantime, in the first layer of the anion exchanger, the hexavalent chromium is reduced and removed, using liquid phase, as a concentrated reclaimed chromium. The first layer of the base anion exchanger is used, after it was regenerated using the above method, for the filtration of the following portion of the inlet recirculated water. The invention also suggests the introduction of sulphur dioxide to the layer of the base anion exchanger which was saturated by hexavalent chromium to enable the reduction to the trivalent chromium