The invention discloses a preparation method of high purity
ammonium rhenate, the method comprises the following steps of S1, dissolving
ammonium rhenate in pure water to obtain an
ammonium rhenate solution and adjusting pH value to 7 to 10, then performing oxidation and
precipitation in sequence, and centrifuging to obtain an ammonium rhenate solution without containing TI; S2, after performing concentration and
crystallization on the ammonium rhenate solution without containing TI, performing oxidation volatilization to obtain a
perrhenic acid solution; S3, exchanging the
perrhenic acid solution by adopting a cation exchange resin for removing impurities; S4, adding
ammonia water into the
perrhenic acid solution subjected to adsorption and impurities removal and performing concentrationand
crystallization to obtain the high purity ammonium rhenate. According to the preparation method of the high purity ammonium rhenate disclosed by the invention, TI<+> in the ammonium rhenate solution is oxidized into TI<3+>, a harmful
impurity TI is removed through a synergistic effect of hydrolytic
precipitation of TI<3+> and adsorption packaging of a flocculating agent, then trace TI and other
impurity elements are removed through oxidation volatilization,
ion exchange and concentration
crystallization to obtain the high purity ammonium rhenate with low TI content, the high purity ammonium rhenate meets the requirements of
rhenium with low TI content in aeronautical material.