关键词: 废物处理, 回收, 配合物, 分离

Abstract: The content of cobalt in the waste cobalt and manganese catalyst in the production of PTA was low and the content of manganese was high. The common cobalt and manganese separation methods generally were not suitable for this material and would make cobalt and manganese mixed with each other,leading to incomplete separation. Ammonia - carbonate method was used in the separation of the cobalt and manganese from lixivium of the waste residue of PTA in this paper. As the surplus rate of cobalt and the precipitation rate of manganese were used as assessment indicators,the effects of the carbonates' types,reaction time,temperature,stirring speed,the amount of ammonia and the amount of carbonate on the separation effect of cobalt and manganese were studied on the basis of orthogonal experiments. Experimental results show that,in the solutions of ammonia-sodium carbonate,ammonium carbonate and ammonium bicarbonate,the best reaction condition is: stirring rate 200r/min,reaction time 8 hours and temperature 20℃. The amount of ammonia is 1.9,1.4 and 1.7 times of chemical stoichiometric coefficient, respectively, and the amount of carbonate is 1.0,1.3 and 1.3 times. The surplus rate of cobalt in these three solutions can reach to 96.0%,99.8% and 99.5%,respectively,and the precipitation rate of manganese can all reach 100%.

Key words: waste treatment, recovery, complexes, separation