Summary
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1.
A study was made of the conditions ensuring complete separation of zinc and cobalt from aluminum and iron, the latter being precipitated with ammonia, in the form of basic acetates, or with pyridine.
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It was shown that, for the first of these methods, complete separation of both zinc and cobalt from aluminum and iron is attained only within a narrow pH range, 5.5–5.9, and it is necessary that not less than 5% of ammonium salt should be present. Under these conditions separation is attained irrespective of the relative amounts of the ions to be separated. It was shown that ferrice hydroxide is a “collector” for aluminum hydroxide and presence of iron in the solution permits complete precipitation of aluminum at relatively low pH.
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The “acetate-hydrolysis” method is unsuitable when zinc or cobalt is accompanied only by aluminum, for the latter very incompletely precipitated. However, the presence of iron in amounts exceeding the amount of aluminum removes this defect of the method. Precipitation of ferric and aluminum hydroxides with excess of pyridine gives excellent separation of zinc and cobalt from aluminum and iron.
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Morachevsky, Y.V., Bashun, Z.S. Investigation with the aid of labeled atoms of the conditions required for the separation of zinc and cobalt from aluminum and iron. Russ Chem Bull 5, 1213–1224 (1956). https://doi.org/10.1007/BF01173778
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DOI: https://doi.org/10.1007/BF01173778