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Synchysite is a rare mineral which has potential as a new source of rare earth elements. The influence of roasting temperature and time on the solubility of rare earth elements from a synchysite concentrate is examined. The maximum solubility of rare earth oxides in 57% HNO 3 was 97% in a sample roasted at 700°C for 120min. Increasing the roasting temperature decreased solubility due to formation...
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