由铜一铬废催化剂制备K_2Cr_2O_7和CuSO_4·5H_2O

PREPARATION OF K_2Cr_2O_7 AND CuSO_4 5H_2O BY TREATING WASTE CATALYST CONTAINING Cu AND Cr

对铜一铬废催化剂可以进行回收利用。研究结果表明，废催化剂高温碱熔的最佳条件是：碱加入量为理论值的１１倍，５３０℃下碱熔氧化１ｈ。可利用ＣａＣｌ２脱除碱熔后浸取液中的硅化合物，当ＣａＣ１２的用量为理论值的１３５倍时，硅的脱除率达９７％。将脱硅后的浸取液酸化，与ＫＣＩ进行复分解反应后可制得Ｋ２Ｃｒ２Ｏ７；用酸溶解碱熔后留下的固体残渣，溶液蒸发、结晶后可得到ＣｕＳＯ４·５Ｈ２Ｏ。

Waste catalyst containing Cu and Cr can be used to prepare K2Cr2 O7and CuSO4 5H2O The fusion percent of Cr2O3100%when the waste catalyst is fused with alkali and excess ccarstic soda for hour at 530 The sil- icon is divorced from extractum by adding CaCl2 The Na2Cr2O7 solution is obtained when extractum is treated by chlorhydric acid, and then it reacts with KCl to generate K2Cr2O7