采用钠化焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中经济高效回收Pd和Al_(2)O_(3)  

Economical and efficient recovery of Pd and Al_(2)O_(3)from spent Pd/Al2O3 catalyst with integrated sodium roasting−reductive leaching process

作　　者：董中林 李骞[1] 饶雪飞[1] 徐斌[1] 杨永斌[1] 董海刚[2] 姜涛[1] Zhong-lin DONG;Qian LI;Xue-fei RAO;Bin XU;Yong-bin YANG;Hai-gang DONG;Tao JIANG(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Kunming Institute of Precious Metals,Kunming 650106,China)

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]昆明贵金属研究所铂金属综合利用先进技术国家重点实验室,昆明650106

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第7期2245-2254,共10页中国有色金属学报（英文版）

基　　金：the financial support from the Science and Technology Plan of Yunnan Province,China(No.2018ZE001);the National Key Research and Development Program of China(No.2018YFE0110200);the Key Research and Development Program of Hunan Province,China(No.2020SK2125);the Science and Technology Plan of Department of Natural Resources of Hunan Province,China(No.2020-21)。

摘　　要：开发了钠焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中回收Pd和Al_(2)O_(3)。钠化焙烧热力学分析表明,在最佳的Na_(2)O/Al_(2)O_(3)摩尔比和温度下,NaOH、Na_(2)CO_(3)和Na_(2)C2O4均可以与Al_(2)O_(3)完全反应生成Na Al O2。NaOH、Na_(2)CO_(3)和Na_(2)C_(2)O_(4)的焙烧渣经水浸后,Al_(2)O_(3)浸出率分别为99.6%、61.0%和55.3%。机械活化-NaOH无水焙烧工艺避免了焙烧渣的固结且可获得较高的Al_(2)O_(3)浸出率。N_(2)H_(4)·H_(2)O还原浸出避免了水浸过程中Pd的溶解损失且催化剂中99.7%的Al_(2)O_(3)被浸出。最终得到Na Al O2浸出液和富钯渣,其中有价的铝和钯可被进一步回收。An integrated sodium roasting-reductive leaching process was developed to recover Pd and Al_(2)O_(3)from spent Pd/Al_(2)O_(3)catalyst.The thermodynamic analysis of sodium roasting indicated that NaOH,Na_(2)CO_(3)and Na_(2)C_(2)O_(4)could completely react with Al_(2)O_(3)to form NaAlO_(2)at the optimal Na2O/Al_(2)O_(3)molar ratio and temperature.The Al_(2)O_(3)leaching ratios were 99.6%,61.0%and 55.3%,respectively,when the roasted residues from NaOH,Na_(2)CO_(3)and Na_(2)C_(2)O_(4)roasting were subjected to water leaching.Mechanical activation-dry NaOH roasting process avoided the consolidation of roasted residue,and high Al_(2)O_(3)leaching ratio could be obtained.Reductive leaching with N_(2)H_(4)·H_(2)O averted Pd dissolution loss during water leaching,and 99.7%of Al_(2)O_(3)in the catalyst was leached.NaAlO_(2)leachate and Pd-enriched residue were finally obtained,and the valuable Al and Pd can be further recovered.

关 键 词：废Pd/Al_(2)O_(3)催化剂 Pd和Al_(2)O_(3)的回收 钠化焙烧 机械活化 还原浸出 

分 类 号：TQ133.1[化学工程—无机化工] TF836[冶金工程—有色金属冶金] X70[环境科学与工程—环境工程]