摘要
The influence of pulp temperature on the floatability and adsorption behavior of fine wolframite with sodium oleate was investigated by microflotation experiments, electric conductivity tests, adsorption measurements, and FT-IR analysis. Microflotation results show that fine wolframite with sodium oleate exhibits a good floatability at pH 8–9. Electric conductivity tests indicate that the high temperature enhances the ionization degree and electric mobility of oleate species, then the flotation recovery of fine wolframite and the adsorption amount of sodium oleate are observed to increase with the rise in pulp temperature. The results of adsorption experiments are found to meet Freundlich isotherms successfully, and the isosteric enthalpy （ΔH^Θ） is in conformity with the chemical bonding. The changes in FT-IR analysis provide sufficient evidence that sodium oleate interacts with the metal cations of wolframite surface, and the increase in pulp temperature clearly promotes the chemisorption intensity. These findings will be beneficial to strengthen the flotation behavior of fine wolframite.
通过单矿物浮选试验、电导率测试、吸附量测定和红外光谱分析,研究了温度对油酸钠在微细粒黑钨矿表面吸附行为及其可浮性的影响。结果表明,油酸钠作捕收剂,微细粒黑钨矿在p H值8～9区间具有良好的可浮性;矿浆温度升高有助于增强油酸组分的电离度和迁移率,进而增加油酸钠在矿物表面的吸附量和黑钨矿的浮选回收率。吸附试验结果表明油酸钠在黑钨矿表面吸附符合Freundlich等温线,由吸附焓变(ΔH~Θ)推断油酸钠在黑钨矿表面为化学吸附。红外光谱分析充分证明了油酸钠能够与黑钨矿表面的金属离子发生反应,且温度越高化学吸附作用越强。这些结果将有助于强化微细粒黑钨矿的浮选行为。
作者
MENG Qing-you
FENG Qi-ming
OU Le-ming
孟庆有;冯其明;欧乐明(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;School of Mineral Processing and Bioengineering,Central South University,Changsha 410083,China)
基金
Project(51704058)supported by the National Natural Science Foundation of China
