甲壳素渗析膜分离钪锡

THE SEPARATION OF SCANDIUM AND TIN BY CHITIN DIALYSIS MEMBRANE

研究用自制的甲壳素膜电渗析法分离钪与锡，该甲壳素与交联剂形成的阴离子交换膜能选择性地通过ＳｎＯ３２－阴离子，使溶液中的Ｓｃ３＋与ＳｎＯ２＋３分离。实验考查了电压、酸度和浓度等条件对ＳｎＯ３２－透过率的影响。结果表明，在电压为２０Ｖ，膜两侧ｐＨ差值ΔｐＨ＞７时，在２１０ｍｉｎ内ＳｎＯ２－３与Ｓｃ３＋能完全分离。用甲壳素膜分离，允许ＳｎＯ２－３浓度范围在３００ｍｇ／Ｌ以下。

The membrane separation of scandium and tin was investigated by dialysis method. The anion membrane was made from the chitin and cross linking agent. SnO 2- 3 anion can pass through the anion membrane but Sc 3+ can not, so that both SnO 2- 3 and Sc 3+ can be separated. The effects of some condition such as voltage, acidity and concentration on transmittance were examined. The result showed that at voltage 20V,ΔpH>7, the thorough separation of SnO 2- 3 and Sc 3+ can be completed in 210min. The concentration of SnO 2- 3 to be separated using the anion membrane must be <300mg/L.