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精对苯二甲酸(PTA)生产中的废钴锰催化剂中钴低锰高,常用的钴锰分离方法一般不适用,分离钴锰时非常容易互相夹带,导致分离不完全。本文采用氨-碳酸盐法分离PTA废渣浸出液中的钴和锰。在正交试验的基础上,以钴剩余率和锰沉淀率作为考核指标,考察了碳酸盐的种类、反应时间、反应温度、搅拌速度、氨的用量和碳酸盐的用量等因素对钴、锰分离效果的影响。实验结果表明,在氨-碳酸钠、氨-碳酸铵、氨-碳酸氢铵3种溶液中,最佳搅拌速度、反应时间、反应温度分别为200r/min、8h和20℃,氨的最佳用量分别为理论化学反应计量的1.9倍、1.4倍和1.7倍,碳酸盐的用量分别为理论化学反应计量的1.0倍、1.3倍和1.3倍。在最佳反应条件下,氨-碳酸钠、氨-碳酸铵、氨-碳酸氢铵3种溶液中,钴的最大剩余率分别可达到96.0%、99.8%和99.5%,锰沉淀率均可达到100%。
The cobalt-manganese low-manganese high cobalt-manganese catalyst used in the production of refined terephthalic acid (PTA) generally does not apply to the cobalt-manganese separation method, which is very easy to entrain with each other when the cobalt-manganese is separated, resulting in incomplete separation. In this paper, ammonia and carbonate were used to separate cobalt and manganese from the leachate of PTA waste residue. On the basis of orthogonal test, taking the cobalt residual rate and manganese deposition rate as evaluation indexes, the influence of the type of carbonate, reaction time, reaction temperature, stirring speed, ammonia dosage and the amount of carbonate on cobalt , Manganese separation effect. The experimental results showed that the optimum stirring speed, reaction time and reaction temperature were 200r / min, 8h and 20 ℃, respectively, among the three solutions of ammonia - sodium carbonate, ammonia - ammonium carbonate and ammonia - ammonium bicarbonate The dosage was 1.9 times, 1.4 times and 1.7 times of the theoretical chemical reaction, respectively. The dosage of carbonate was 1.0 times, 1.3 times and 1.3 times that of the theoretical chemical reaction, respectively. Under the optimal reaction conditions, the maximum residual rates of cobalt, ammonia-ammonium carbonate, ammonia-ammonium carbonate and ammonia-ammonium bicarbonate were 96.0%, 99.8% and 99.5% 100%.