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Removal of iron from iron-rich solutions of nickel and cadmium sulphate
321 Electricity consumption is 30 W h / m 3. Newly developed, modified ion exchange membranes were used to provide an entirely new technology of purification of saline waters to produce fresh water and valuable mineral substances.
I. Haklits, A. Nagy, L. Kiss, P. Simon and O. Nagy, Research Institute of the Plastics Industry, North Hungarian Chemical Works, and Technical University of Budapest, Budapest, Hungary: Cadmium Removal From Waste Water by Ion Exchange An ion exchange system was developed for treating cadmium-containing waste water from plants manufacturing accumulators. Two typical streams with different contents of cadmium and accompanying aluminum and magnesium were examined. The competition from aluminum and magnesium can be eliminated by sorption of cadmium as chloro-complex on an anion exchanger in chloride form. The stream with low cadmium content is first preconcentrated by sorption of all metal cations on a cation exchanger in H form and subsequent elution with hydrochloric acid. Process details are provided.
1~. Horv~tovfi, Water Research Institute, Bratislava, Czechoslovakia: Ammonia Removal by Slovak Natural Clinoptilolite Static and dynamic experiments were carried out for removal of ammonia from water by natural Slovakian zeolite. Untreated and Na-form clinoptilolite were used in the experiments. In the static experiments the initial ammonia concentration ranged between 10 and 2740 m g / d m 3. Equilibrium data and selectivity coefficients were calculated. It is concluded that the Na-form clinoptilolite is selective for ammonia over the entire range of zeolite composition. In the dynamic experiments three different model solution (56, 106 and 134 mg NH~--N/dm ~) were used and the breakthrough capacity was measured. Finally, ammonia was removed from industrial waste water and the Na-form clinoptilolite proved far superior to the untreated material.
Gfibor Sinka and Mih~ly Vigvfiri, HUNGALU Engineering and Development Centre, Budapest, Hungary: Removal of Iron from Iron-rich Solutions of Nickel and Cadmium Sulphate The Aluterv-FKl method for hydrometallurgical processing of scrap alkaline batteries involves the generation of iron-rich solutions of Ni and Cd sulphates. Iron removal in the form of hydroxide precipitate is not suitable: separation as well as mixing of the slurry is almost impossible and its filtration can only be performed at a considerable loss of metallic values. An anion exchange method was applied for the removal of iron from leach liquors, utilizing the selectivity of anionic iron sulphate complex formation over Ni and Cd sulphates. Adsorption rate, adsorption isotherms, distribution coefficients were measured as functions of the iron and sulphuric acid concentrations. Varion AT 660 strong-base synthetic anion exchange resin was used. A two-stage counter-current batch-type ion exchange operation performed at pH 2 resulted in a considerable decrease of the iron content: from 30-50 g / d m 3 to below 5 g / d m 3.
I. Haklits, A. Nagy, L. Kiss, P. Simon and O. Nagy, Research Institute of the Plastics Industry, North Hungarian Chemical Works, and Technical University of Budapest, Budapest, Hungary: Cadmium Removal From Waste Water by Ion Exchange An ion exchange system was developed for treating cadmium-containing waste water from plants manufacturing accumulators. Two typical streams with different contents of cadmium and accompanying aluminum and magnesium were examined. The competition from aluminum and magnesium can be eliminated by sorption of cadmium as chloro-complex on an anion exchanger in chloride form. The stream with low cadmium content is first preconcentrated by sorption of all metal cations on a cation exchanger in H form and subsequent elution with hydrochloric acid. Process details are provided.
1~. Horv~tovfi, Water Research Institute, Bratislava, Czechoslovakia: Ammonia Removal by Slovak Natural Clinoptilolite Static and dynamic experiments were carried out for removal of ammonia from water by natural Slovakian zeolite. Untreated and Na-form clinoptilolite were used in the experiments. In the static experiments the initial ammonia concentration ranged between 10 and 2740 m g / d m 3. Equilibrium data and selectivity coefficients were calculated. It is concluded that the Na-form clinoptilolite is selective for ammonia over the entire range of zeolite composition. In the dynamic experiments three different model solution (56, 106 and 134 mg NH~--N/dm ~) were used and the breakthrough capacity was measured. Finally, ammonia was removed from industrial waste water and the Na-form clinoptilolite proved far superior to the untreated material.
Gfibor Sinka and Mih~ly Vigvfiri, HUNGALU Engineering and Development Centre, Budapest, Hungary: Removal of Iron from Iron-rich Solutions of Nickel and Cadmium Sulphate The Aluterv-FKl method for hydrometallurgical processing of scrap alkaline batteries involves the generation of iron-rich solutions of Ni and Cd sulphates. Iron removal in the form of hydroxide precipitate is not suitable: separation as well as mixing of the slurry is almost impossible and its filtration can only be performed at a considerable loss of metallic values. An anion exchange method was applied for the removal of iron from leach liquors, utilizing the selectivity of anionic iron sulphate complex formation over Ni and Cd sulphates. Adsorption rate, adsorption isotherms, distribution coefficients were measured as functions of the iron and sulphuric acid concentrations. Varion AT 660 strong-base synthetic anion exchange resin was used. A two-stage counter-current batch-type ion exchange operation performed at pH 2 resulted in a considerable decrease of the iron content: from 30-50 g / d m 3 to below 5 g / d m 3.