A New Method for the Production of Tungstic Acid from Tungstates

Abstract

This paper deals with a characteristic property of tungstic acid and its reaction with hydrochloric acid solution. The authors' experiments prove that tungstic acid freshly formed from tungstate by decomposition with hydrochloric acid, dissolves in its concentrated acid solution forming a chemical compound, provided that the produced tungstic acid is brought into contact with concentrated hydrochloric acid immediately after its formation. It was found also that if the degree of its concentration 1s reduced, this chemical compound gives the insoluble tungstic acid as a precipitate in the solution. Details are given for lixiviating the tungstic acid from tungstate · and for preparing it.