Research on Activation Mechanism of Ce3+ Ions on Calcite in Rare Earth Ore Flotation
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摘要:
通过单矿物浮选试验、红外光谱分析和Zeta电位测试等方法，研究了以辛基异羟肟酸（OHA）为捕收剂浮选稀土时矿浆中Ce3+离子对脉石矿物方解石的活化作用机理。浮选结果表明，当辛基异羟肟酸OHA浓度为2.5×10-4 mol/L，矿浆中Ce3+离子浓度小于1×10-4 mol/L时，在pH 6~11之间Ce3+对方解石有活化作用。机理分析结果表明，Ce3+离子在方解石表面作用后形成活性位点，能与辛基异羟肟酸根作用生成稳定的五元环螯合物，从而促进了捕收剂羟肟酸在方解石表面的吸附作用，使方解石浮选被活化。
Abstract:The activation mechanism of Ce3+ ions on calcite in rare earth ore flotation using octanohydroxamic acid as collector was studied by single mineral flotation experiment, IR spectroscopy and Zeta potential measurement. The flotation results show that Ce3+ ions could activate the flotation of calcite at pH 6~11 when the Ce3+ concentration was less than 1×10-4 mol/L and OHA concentration was 2.5×10-4 mol/L. The mechanism results show that Ce3+ ions could act as the active site on calcite surface, which reacted with OHA ions to form stable five-membered ring chelate. Therefore, the adsorption of collector OHA on calcite was promoted and thus calcite flotation was activated.
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Key words:
- calcite /
- bastnaesite /
- Ce3+ ions /
- activation
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表 1 不同pH值下难免金属离子对方解石回收率的影响
Table 1. The effect of inevitable metal ions on calcite recovery under different pH values
pH 无离子 Ce3+离子(mol/L) Fe3+离子(mol/L) Al3+离子(mol/L) Ca2+离子(mol/L) 5×10-5 1×10-4 5×10-5 1×10-4 5×10-5 1×10-4 5×10-5 1×10-4 6.6 38% 44% 49% 35.5% 33% 35% 32% 31% 34% 8 59% 68.5% 80% 57.5% 56% 53% 50% 46.5% 55% 9.2 78% 88.4% 94.5% 72.8% 70% 73.2% 69% 60% 73.5% 10 81% 94.5% 96% 77.1% 74.5% 78% 72% 62% 79% 11.5 55% 55.5% 58% 39.5% 38% 50% 46.5% 53.5% 62% 
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