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通过纯矿物试验,研究了氟碳铈矿在油酸钠为捕收剂体系下的浮选行为,当油酸钠用量5×10-5mol.L-1时,pH=6.5～11范围内,氟碳铈矿浮选回收率均在91%以上,在pH=8.5,氟碳铈矿浮选回收率最高,为99.77%。红外光谱检测结果表明,经过油酸钠作用,氟碳铈矿表面出现了油酸钠中-CH3和-CH2-的伸缩振动吸收峰;且氟碳铈矿的CO23-的反对称伸缩振动吸收峰偏移了28.93 cm-1,因此油酸钠在氟碳铈矿表面发生了化学吸附。根据油酸钠溶液化学计算,在pH=8.5时,油酸钠溶液的优势组分为C17H33COO-和(C17H33COO)22;结合氟碳铈矿在油酸钠捕收剂下的浮选行为,随着pH在2.00～8.04范围内上升,油酸钠溶液中C17H33COO-,(C17H33COO)22-含量上升,氟碳铈矿浮选回收率也上升;而当pH<5时,油酸钠的优势组分为C17H33COOH(aq),但回收率<40%,因此推测是C17H33COO-和(C17H33COO)22-在矿物表面发生化学吸附,从而决定氟碳铈矿的浮选,此外可能存在C17H33COOH(aq)和C17H33COOH(C17H33COO)-的物理吸附。根据氟碳铈矿晶体化学,由于氟碳铈矿解理0001发育,而在矿物表面容易暴露Ce3+,Ce3+在矿浆水溶液中溶解和水解而生成铈羟基络合物,铈羟基络合物吸附在矿物表面而成为浮选的活性点,Ce羟基络合物再与C17H33COO-和(C17H33COO)22反应生成了Ce(C17H33COO)3。
Through the pure mineral test, the flotation behavior of bastnaesite in the presence of sodium oleate as collector was studied. When the amount of sodium oleate was 5 × 10-5mol.L-1, the pH ranged from 6.5 to 11, Bastnasite flotation recovery rates were above 91%, at pH = 8.5, bastnaesite flotation recovery was the highest, 99.77%. The result of FTIR showed that the stretching vibration absorption peak of -CH3 and -CH2- in sodium oleate appeared on the surface of bastnaesite after the action of sodium oleate, and the antisymmetric stretching vibration absorption peak of bastnaesite CO23- Shifted by 28.93 cm-1, so sodium oleate chemisorbed on the surface of bastnaesite. According to the stoichiometric calculation of sodium oleate solution, the dominant components of sodium oleate solution are C17H33COO- and (C17H33COO) 22 at pH = 8.5. Combining the flotation behavior of bastnaesite with sodium oleate collector, With the increase of pH in the range of 2.00 ~ 8.04, the content of C17H33COO -, (C17H33COO) 22- increased in the sodium oleate solution and the recovery of bastnaesite flotation increased. At pH <5, the dominant group of sodium oleate C17H33COOH (aq), but the recovery rate was <40%. Therefore, it is presumed that C17H33COO- and (C17H33COO) 22- chemisorbed on the mineral surface to determine the flotation of bastnaesite. In addition, C17H33COOH Physical adsorption of C17H33COOH (C17H33COO) -. According to the bastnaesite crystal chemistry, due to bastnaesite 0001 cleavage development, and in the mineral surface easily exposed Ce3 +, Ce3 + in the pulp aqueous solution to dissolve and hydrolysis to generate cerium hydroxyl complexes, cerium hydroxyl complexes adsorbed on the mineral Surface to become the active site of flotation, Ce hydroxy complexes with C17H33COO- and (C17H33COO) 22 reacts with Ce (C17H33COO) 3.