【摘要】 ZnY^2-络合物的酸化结晶分离,是利用酸效应,将 logK_ZnY由16.50降低到-2.58,ZnY^2-中的 EDTA 就会自然析出.同时测定了反应速度 V 和反应自由能△G.EDTA 结晶经陈化后,回收率达90%,其中残留的 Zn 小于0.06%,可返回利用.母液中的锌可借助 Zn（OH）₂沉淀浓缩,Zn（OH）₂沉淀稀酸溶解后,可直接再生阳离子树脂,一直返复循环.更多还原

【Abstract】 The Separation of acidifying crystallization of complex ZnY^2-is doneby making use of acid effect;when LogK_ZnYis reduced to -2.58 from16.50,the EDTA of complex ZnY^2-will be separated out naturally,and the reaction velocitvy and free energy △G can be determined in themeantime.After aging,the recovery of EDTA is more than 90%,theremnant Zn in EDTA is below 0.06%,80 EDTA can be used again.Zinc（in form of Zn（OH）₂）in the mother solution can give rise to positiveion column again when the solution of Zn（OH）₂ has been concentrated,precipitated and dissolved,it can be used allalong in cycling.更多还原