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采用硫酸化焙烧—酸浸工艺从汽车失效催化剂中同时浸出回收铈、锆、镧,分别选取固液比、浸出时间、浸出酸度三个主要影响浸出的因素。在单因素条件实验结果基础上,采用响应曲面法优化浸出条件。实验结果表明,铈和镧的浸出影响因子的显著顺序为:固液比>酸度>浸出时间,锆的浸出影响显著性顺序为:酸度>浸出时间>固液比,优化后的最佳工艺条件为液固比9∶1,常温浸出3 h,浸出液酸度[H+]为0.6 mol/L,铈、锆、镧浸出率分别可达到:Ce 92%、La 99.3%、Zr 81%,实际值与预测值偏差较小,说明响应曲面法优化回收铈、锆、镧的模型准确有效。
Sulfate roasting-acid leaching process was used to leach and recover cerium, zirconium and lanthanum simultaneously from the catalyst which was lost in the automobile. Three factors affecting the leaching, such as solid-liquid ratio, leaching time and leaching acidity, were selected respectively. Based on the experimental results of single factor conditions, the response surface method was used to optimize the leaching conditions. The experimental results show that the order of influencing factors for the leaching of cerium and lanthanum is as follows: solid-liquid ratio> acidity> leaching time, the significant order of influence on the leaching of zirconium is: acidity> leaching time> solid-liquid ratio and the optimized process conditions The leaching rate of the leaching solution was 0.6 mol / L and the leaching rate of cerium, zirconium and lanthanum were respectively 92%, 99.3%, 81% and 81% The deviation of the predicted value is small, which shows that the response surface method is an accurate and effective method to recover the cerium, zirconium and lanthanum.