593 Following flotation, all products were filtered, dried at 60 °C for 24 h, weighed, and subsequently analyzed for REE content by inductively coupled plasma mass spectrometry (ICP-MS). Figure 1 - Adapted laboratory flotation setup used in the flotation experiments, comprising a beaker-based flotation cell with a froth collection support, placed inside a water bath system to ensure temperature control during operation. 2.3 Chemical analysis As already mentioned, all products obtained from the flotation experiments, as well as the feed material, were analyzed for REE content by ICP-MS. Prior to analysis, the samples were subjected to microwave-assisted acid digestion using a mixed acid system consisting of hydrochloric acid (HCl), nitric acid (HNO₃), perchloric acid (HClO₄), and hydrofluoric acid (HF), following standard procedures for the complete dissolution of silicate- and carbonate-rich mineral matrices. Approximately 2 g of each solid sample were used for the digestion process. The resulting solutions were subsequently diluted to appropriate concentrations and analyzed by ICP-MS for quantitative determination of REEs. 3. RESULTS
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