Abstract To achieve the efficient flotation separation of barite from fluorite, citric acid (CA) was utilized as a depressant for fluorite in this study. Microflotation showed that both fluorite and barite had good floatability when using sodium oleate (NaOl) as the collector, while fluorite was selectively depressed when using CA as the depressant. Real ore flotation confirmed that CA could be used as a depressant to successfully separate barite from fluorite. Adsorption experiments and ICP-AES tests revealed that the addition of CA caused the dissolution of Ca2+ from the fluorite surface, but it had no significant effects on Ba2+ on the barite surface. SEM-EDS analysis further revealed a reduction in the Ca/F ratio on the fluorite surface with the addition of CA. Zeta potential measurements indicated that NaOl could be adsorbed onto the barite surface rather than the fluorite surface in the presence of CA. Solution chemistry calculations demonstrated that L3− more easily interacts with Ca2+ than Ba2+ at pH 8.5. These findings indicated that the selective inhibition of fluorite by CA could be attributed to the dissolution of Ca2+ from the mineral surface, which reduced the number of activated sites for the adsorption of NaOl.

中文翻译：

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柠檬酸作为抑制剂在萤石中浮选重晶石中的应用

摘要 为了实现重晶石与萤石的高效浮选分离，本研究采用柠檬酸(CA)作为萤石抑制剂。微浮选表明，以油酸钠(NaOl)为捕收剂时，萤石和重晶石均具有良好的可浮性，而以CA为抑制剂时，萤石被选择性地抑制。实际矿石浮选证实，CA 可用作抑制剂，成功地将重晶石与萤石分离。吸附实验和ICP-AES测试表明，CA的加入引起萤石表面Ca2+的溶解，但对重晶石表面的Ba2+无显着影响。SEM-EDS 分析进一步揭示了加入 CA 后萤石表面的 Ca/F 比降低。Zeta 电位测量表明，在 CA 存在下，NaOl 可以吸附到重晶石表面而不是萤石表面。溶液化学计算表明，在 pH 8.5 时，L3− 比 Ba2+ 更容易与 Ca2+ 相互作用。这些发现表明，CA 对萤石的选择性抑制可能归因于从矿物表面溶解 Ca2+，这减少了吸附 NaOl 的活化位点数量。