Highly efficient recovery of molybdenum from spent catalyst by an optimized process
Highly efficient recovery of molybdenum from spent catalyst by an optimized process
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DOI：
10.1080/10962247.2020.1792377
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发表时间：
2020-07
影响因子：
2.7
通讯作者：
Menglei Zhang;Hao Song;Cheng-hang Zheng;Z. Lin;Yi Liu;Weihong Wu;Xiang Gao
中科院分区：
文献类型：
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作者：
Menglei Zhang;Hao Song;Cheng-hang Zheng;Z. Lin;Yi Liu;Weihong Wu;Xiang Gao
如何经济、绿色地处理废旧催化剂已成为工业生产中备受关注的问题。为回收废催化剂，开发了酸浸、溶剂萃取和汽提工艺。本研究通过比较不同的萃取剂和剥离剂，重点寻找最佳的萃取和剥离工艺，对钼进行了选择性回收。为有效分离钼和其他金属，研究了不同官能团的三辛基甲基氯化铵、三正辛胺、三（2-乙基己基）胺、磷酸二（2-乙基己基）和磷酸三丁酯5种不同萃取剂的萃取机理；首次在同一体系下系统地研究了这5种萃取剂的萃取能力和萃取机理。结果表明，在最佳条件下，以三正辛胺或三辛基甲基氯化铵为有机相，钼的提取率可达98%以上。结果表明，三正辛胺和甲基三辛基氯化铵具有较好的钼萃取能力，其余萃取剂的萃取能力依次为二（2-乙基己基）磷酸>三（2-乙基己基）胺>磷酸三丁酯。在汽提过程中，选择NH4OH、NaOH和H2SO4作为汽提剂，从负载的三正辛胺有机相中汽提钼。三种脱模剂的脱模能力依次为NaOH > NH4OH > H2SO4。傅里叶变换红外光谱（FTIR）表明，在萃取和剥离过程中，三正辛胺有机相结构稳定。结果表明，优化后的浸提提工艺可高效回收钼。意义：系统地研究了一系列不同的萃取剂和汽提剂，以比较它们在同一体系下的萃取和汽提能力。在此基础上，提出了一种优化的萃取汽提工艺，可有效回收废催化剂中的钼。该方法可以经济、环保地处理废催化剂。
ABSTRACT Disposal of spent catalyst in an economical and green way has become a great concern for industrial production. We developed a process including acid leaching, solvent extraction and stripping in order to recycle spent catalyst. In this study, we conducted selective recovery of molybdenum through focus on finding an optimized extraction and stripping process by comparing different extractants and stripping agents. To separate molybdenum from other metals efficiently and figure out the mechanism of extraction process, the five different extractants of methyl trioctyl ammonium chloride, tri-n-octylamine, tris (2-ethylhexyl) amine, bis (2-ethylhexyl) phosphate, and tributyl phosphate with different functional groups were examined; the extraction ability and extraction mechanism of these five extractants were systematically studied under the same system for the first time. It was found that more than 98% of the molybdenum could be extracted with an organic phase consisting of tri-n-octylamine or methyl trioctyl ammonium chloride under the optimal conditions. The result indicated that the tri-n-octylamine and methyl trioctyl ammonium chloride possess excellent molybdenum extraction ability, the extraction capacity of the rest extractants was in the order of bis (2-ethylhexyl) phosphate > tris (2-ethylhexyl) amine > tributyl phosphate. In the stripping process, NH4OH, NaOH, and H2SO4 were chosen as stripping agent to strip the molybdenum from the loaded tri-n-octylamine organic phase. The stripping ability of the three studied stripping agents was in the order NaOH > NH4OH > H2SO4. The Fourier transform infrared (FTIR) spectra showed that the structure of the tri-n-octylamine organic phase was stable during the extraction and stripping process. Results showed that molybdenum could be highly and efficiently recovered by optimized extraction and stripping process. Implications: A series of different extractants and stripping agent have been systematically studied in order to compare their extraction and stripping ability under the same system. Based on the obtained results, an optimized extraction and stripping process was proposed to recycle molybdenum from spent catalyst efficiently. It is possible to dispose spent catalysts in an economic and environmental way by this developed metal recovery process.