| 摘要 |
PURPOSE:To recover efficiently rhenium from a waste acid produced as a by- product in a stage for refining a nonferrous metal by treating the waste acid by specified systems in order. CONSTITUTION:Gaseous SO2 generated in a stage for refining a nonferrous metal such as copper is scrubbed with water, and part of produced sulfuric acid is periodically drawn as waste sulfuric acid. This waste acid contg. Re, Hg, Mo, Bi, As, etc. is treated with a resin having strong Hg adsorbing power such as ''VR-2200HT'' of UNICHIKA K.K. to remove the Hg, and it is treated with an anion exchange resin such as ''Dia Ion PA408'' of MITSUBISHI KASEI KOGYO K.K. to adsorb the Re, Mo, Bi and As. An aqueous NaOH soln. is passed through the resin to remove the Mo and As by elution, and about 3-9N hydrochloric acid is passed to elute the Re and Bi. The eluted Re is then recovered from the eluate as rhenium sulfide.
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