中文摘要：

探讨了酸浸-水解法分离提取丙烯腈废催化剂中铋、镍的工艺条件,采用先酸浸后水解的方法,利用硝酸铋的水解特性实现酸浸液中铋、镍的分离。研究结果表明,在温度80℃、反应时间1.5 h、酸浓度3 mol/L、液固比5的最优酸浸条件下,铋、镍浸出率分别为97.49%和81.81%;在温度80℃、水解时间60 min、液液比8的最优水解条件下,水解沉淀中铋提取率为89.57%,水解液中镍提取率为94.86%;铋、镍的总回收率均可达75%以上。水解沉淀的Bi/Ni值从原料的0.297增大到136.76,水解液的Ni/Bi值从原料的3.37降低到0.007,有效实现了铋与镍的分离。

英文摘要：

The extraction of Bi and Ni from spent acrylonitrile catalyst by the process of acid leaching-hydrolyzing was studied in laboratory. Hydrolyzing of bismuth nitrate after acid leaching can result in the separation between Bi and Ni in acid leaching solution. In the test, leaching at 80 ℃ for 1.5 h, with acid concentration at 3 mol/L and liquid to solid ratio of 5, resulted in the leaching rate of 97.49% and 81.81% for Bi and Ni, respectively. The following hydrolyzing process at 80 ℃ for 60 min with liquid/liquid ratio of 8, led to the extraction rate of Bi from hydrolytic precipitation reaching 89.57% and extraction rate of Ni from the hydrolyzing solution reaching 94.86%, with the total recovery of Bi and Ni above 75%. The Bi/Ni value increased from 0.297 （raw material） to 136.76（ hydrolyzing residue）, while the Ni/Bi value decreased from 3.37 （raw material） to 0.007 （hydrolyzing solution）, thus achieving an efficient separation between Bi and Ni.