(1. 中南大学 资源加工与生物工程学院，战略含钙矿物资源清洁高效利用湖南省重点实验室，长沙 410083；
2. 山东理工大学 资源与环境工程学院，淄博 255049)
摘 要: 通过浮选试验，研究十二烷基磺酸钠、十二烷基硫酸钠、油酸、731、环烷酸皂，以及油酸与十二胺的混合捕收剂对锂辉石、长石和石英单矿物浮选行为及锂辉石实际矿石浮选指标的影响。借助Zeta电位、红外光谱分析、吸附量测试及量子化学计算，探讨混合捕收剂的作用机理。结果表明：油酸与十二胺的混合捕收剂，兼有捕收性和选择性好的特点，在碱性条件下能实现锂辉石与长石和石英的浮选分离。混合捕收剂在锂辉石表面的吸附量大于长石和石英。混合捕收剂中油酸在矿物表面以化学吸附为主，十二胺则以物理吸附为主。油酸离子分别与十二胺离子(或分子)和油酸分子以缔合形态存在，油酸的头基COO-与锂辉石表面的Al原子发生化学作用。
关键字: 锂辉石；混合捕收剂；浮选；离子分子缔合；作用机理
（1. School of Minerals Processing & Bioengineering, Central South University, Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Changsha 410083, China;
2. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China）
Abstract:The flotation behaviors of pure minerals such as spodumene, feldspar and quartz, and the effects on flotation index of spodumene ore were studied by flotation test using sodium dodecyl sulfate, sodium dodecyl sulfonate, oleic acid, 731, naphthenic acid soap, and mixed collector of oleic acid and dodecylamine as collector. Furthermore, the interaction mechanisms of the mixed collector were investigated by the measurement of Zeta potential, infrared spectrum analysis, adsorption amount measurement and quantum chemical calculation. The results indicate that the mixed collector of oleic acid and dodecylamine has the characteristics of good collection and selectivity and achieved flotation separation of spodumene from feldspar and quartz under alkaline conditions. The adsorption amount of mixed collector on spodumene is larger than it on feldspar and quartz. Oleic acid is mainly chemisorbed on mineral surface while the adsorption of dodecylamine on mineral surface is physical adsorption. Oleic acid ions exist in association form with dodecylamine ions (or molecules) and oleic acid molecules respectively. The head group COO- of oleic acid reacts with Al atoms on the surface of spodumene.
Key words: spodumene; mixed collector; flotation; ionic-molecular association; interaction mechanism
