Considering the benefits of resource, environment and economy, recycling secondary rare earth resources is becoming an extremely significant resource regeneration way. In this paper, we reported a novel synergistic extraction system combining ionic liquid [OMIm] [PF6] and extractant Cyanex272 to separate and purify the REE from the leachate of waste CRT phosphor powder. Some extraction parameters were studied including extraction acidity, the ratio of organic phase to aqueous phase, the ratio of Cyanex272 and [OMIm] [PF6], extraction time and extraction temperature. The optimal parameters of the extraction process was obtained as extraction acidity 0.2 mol/L, the ratio of organic phase to aqueous phase 1:5, the ratio of Cyanex272 and [OMIm]PF6 XC = 0.4, extraction time 10 min and extraction temperature 25 ℃. Under these conditions, REE is successfully and efficiently extracted and separated with zinc and aluminum, which revealed a potential application for REE separation and purification from electronic waste.
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This work was financially supported by Beijing Nova Program (Z1511000003150141), National Natural Science Foundation of China (2174068), Academician Workstation in Yunnan Province and Key Discipline for Resource, Environment & Circular Economy of Beijing (Q5104001201503).
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