(1. 中南大學 資源加工與生物工程學院，戰(zhàn)略含鈣礦物資源清潔高效利用湖南省重點實驗室，長沙 410083；
2. 山東理工大學 資源與環(huán)境工程學院，淄博 255049)
摘 要: 通過浮選試驗，研究十二烷基磺酸鈉、十二烷基硫酸鈉、油酸、731、環(huán)烷酸皂，以及油酸與十二胺的混合捕收劑對鋰輝石、長石和石英單礦物浮選行為及鋰輝石實際礦石浮選指標的影響。借助Zeta電位、紅外光譜分析、吸附量測試及量子化學計算，探討混合捕收劑的作用機理。結果表明：油酸與十二胺的混合捕收劑，兼有捕收性和選擇性好的特點，在堿性條件下能實現(xiàn)鋰輝石與長石和石英的浮選分離。混合捕收劑在鋰輝石表面的吸附量大于長石和石英。混合捕收劑中油酸在礦物表面以化學吸附為主，十二胺則以物理吸附為主。油酸離子分別與十二胺離子(或分子)和油酸分子以締合形態(tài)存在，油酸的頭基COO-與鋰輝石表面的Al原子發(fā)生化學作用。
關鍵字: 鋰輝石；混合捕收劑；浮選；離子分子締合；作用機理
（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
