| 摘要 |
1501552 Removing metal ions from water LEUVEN RESEARCH & DEVELOPMENT VZW 10 March 1976 [19 March 1975] 09636/76 Headings C1A and C1C A process for the removal of metal ions from aqueous solution comprises contacting the solution with a polyamine in the presence of an inorganic cation exchanger. Specified metals are from periods 4, 5, 6 and 7 of the Periodic system in Groups Ib, IIb, IIIa/b, IVa/b, Va/b, VIa/b, VIIa/b and VIII, preferably Hg, Cd, Cu, Zn, Ag, Ni and/or Co. The process is preferably carried out at pH 4-9. Specified amines are ethylene diamine, propylenediamine, triaminotriethylamine, diethylenetriamine, triethylenetriamine, tetraethylenepentamine and tetra-2-aminoethylethylenediamine. Specified inorganic cation exchangers are natural and synthetic tectosilicates and phyllosilicates. The solution may be contacted first with the polyamine and then with the cation exchanger or the polyamine may be adsorbed on to the cation exchanger for subsequent contact with the solution. The metal may be eluted from the cation exchanger by treatment with mineral acids. |
