罗马尼亚在生产甲替吡咯烷酮时使用了含有Cr_2O_347％、CuO41％和MnO_22—4％的催化剂。已研制成从废催化剂中回收铬、锰和铜的方法:为便于使金属转入溶液中,把催化剂与Na_2CO_3按1:2比例混在一起,在温度1150℃下进行氧化焙烧30分钟;接着把焙烧产物按固液比=1:2,置于水中溶解。此时,铬呈铬酸盐形态转入溶液中。之 Romania used a catalyst containing Cr 2 O 347%, CuO 41% and MnO 22-4% in the production of metforopyrrolidone. A method has been developed for recovering chromium, manganese and copper from spent catalyst: in order to facilitate the transfer of the metal to the solution, the catalyst is mixed with Na_2CO_3 in a 1: 2 ratio and subjected to oxidation roasting at a temperature of 1150 ° C for 30 minutes; Calcined product solid-liquid ratio = 1: 2, placed in water to dissolve. At this point, chromium was chromate into the solution. It