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still for utfellning of zinc, cadmium, copper, nickel, cobalt, iron and / or kromjonkomplex of polykarboxylater out of their vattenlosningar
still for utfellning of zinc, cadmium, copper, nickel, cobalt, iron and / or kromjonkomplex of polykarboxylater out of their vattenlosningar
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机译:仍用于从罐中抽出锌,镉,铜,镍,钴,铁和/或多羧基苯甲酸酯的络合物
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摘要
A process for precipitating heavy metal ion-polycarboxylate complexes from solution, said process comprising adding to a solution containing at least one of said complexes an aqueous solution of a water soluble aluminum salt, the anion of which does not form any water soluble complexes with said heavy metal ions to be precipitated or optionally such anion-heavy metal complexes having a stability constant, expressed as their decadic logarithm, of less than 2; wherein 0.9 to 1.8 moles of aluminum ions are employed per equivalent of polycarboxylate; and adjusting the pH of the resulting reaction mixture to about 6.5 to about 9.0 with an alkali metal carbonate.
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