Cruceru, MihailMihailCruceruChircu, SeiaSeiaChircuCraiu, CornelCornelCraiu2017-04-202017-04-201983-01-30RO 81184 Ahttp://hdl.handle.net/123456789/872Patent Assignee Name(s) and Code(s): INST EPUR APEL REZIZn is recovered in 98% yield from residual waters of artificial fibre prodn. by first treating the acidic residue at 90-95 deg.C with a 30% NaOH soln. to pH 4-5., and then treating with a 10% Na2CO3 soln. to pH 8.5-9.5. The pptd. Zn concentrate is sepd. from the supernatant liq. by decantation or filtration, converted to ZnSO4 and crystallized.en-USZincRecoveryResidual waterZinc recovery from artificial fibre prodn. acidic waste waters comprises two step pptn. with sodium hydroxide and then sodium carbonate soln.Procedeu de recuperare a zincului din ape rezidualePatent