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The paper presents results of the study for obtaining perrhenic acid from aqueous ammonium perrhenate solutions by ion exchange. Two ways of perrhenic acid synthesis have been examined: sorption of perrhenate anion on selected anion exchange resins (followed by elution of the sorbed rhenium as HReO 4 ), and sorption of ammonium ion on selected cation exchange resins. The method of ammonium...
The results presented in this paper describe the course and conditions of electrodialytic conversion of zinc chloride to zinc sulphate using mono- and bipolar ion exchange membranes. The object of this work was to find if such a process can be applied to produce zinc sulphate solutions with low concentrations of chloride ions from solutions of zinc sulphate-zinc chloride obtained from raw materials...
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