Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4908727 | Journal of Environmental Chemical Engineering | 2017 | 21 Pages |
Abstract
A stepwise leaching process was developed to recover rare earth elements (REEs) and aluminum (Al) from FCC catalysts manufacturing slag (FCC waste slag), with NaOH and HCl. The FCC waste slag was treated with 2.5Â mol/L NaOH at 293Â K for 0.5Â h to convert 72.4% of Al into NaAlO2. Then, the caustic conversion residue was decompose using 3Â mol/L HCl to control leaching pH at 1.5 under 293Â K for 3Â h. Leaching efficiencies of 94.2%, 98.6% and 98.8% for Al, La and Ce, respectively, were achieved. 98.7% purity of rare earths oxide (REO) product was obtained after further treatments including oxalic acid precipitation and calcination. The filter liquor of oxalic acid precipitation was recycled to acid leaching step to recover the remaining Al. 97.6% REEs and 98.4% Al were recovered in total. Furthermore, the polymerization of metal ions and silicates were found and confirmed by IR and XRD analysis.
Keywords
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Jinyu Wang, Yang Xu, Liangshi Wang, Longsheng Zhao, Qiang Wang, Dali Cui, Zhiqi Long, Xiaowei Huang,