(1. 西南科技大学 固体废物处理与资源化教育部重点实验室,绵阳 621010;
2. 中南大学 资源加工与生物工程学院,长沙 410083)
摘 要: 通过浮选试验、接触角测定后矿物颗粒黏着功的计算以及芘荧光探针检测,考察捕收剂油酸钠对钼酸钙及磷灰石的浮选性能。结果表明:在碱性条件下,两种矿物的浮选行为相似,浮选回收率均可达到80%以上,油酸钠对钼酸钙和磷灰石有很好的捕收性能。六偏磷酸钠用量达到220 mg/L时,钼酸钙的回收率为62.5%,而此时磷灰石的回收率仅有20.3%,两种矿物的可浮性差异显著增加。油酸钠可以显著增加两种矿物颗粒的黏着功,使其更易向气泡粘附并上浮。六偏磷酸钠显著扩大两种矿物的表面疏水性差异,优化其浮选分离条件。油酸钠在钼酸钙及磷灰石表面未形成胶束、半胶束吸附和非静电吸附,而是化学吸附。
关键字: 镍钼矿;尾矿;钼酸钙;黏着功;芘荧光探针;动电位
(1. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education,
Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:The flotation performance of sodium oleate (SOL) on powellite and apatite was investigated through flotation tests, contact angle measurements, work of adhesion calculations and pyrene fluorescent probe detections. The results show that the recovery of two minerals is more than 80% and their flotation behaviors are similar under alkaline conditions. And SOL has good flotation performance on both powellite and apatite. Sodium hexametaphosphate (SHMP) decreases of flotation recovery of powellite and apatite at varying degrees, and the recovery of powellite and apatite are 62.5% and 20.3%, respectively, at SHMP dosage 220 mg/L. SOL can significantly augment the work of adhesion of the two kind of mineral grains, which make them much easier to be absorbed by bubbles and to rise with them. SHMP enlarges dramatically the difference of hydrophobicity between apatite and powellite, which optimizes the flotation separation conditions of two minerals. SOL absorbs on powellite and apatite by chemisorptions rather than micelle, half micelle adsorption or electrostatic adsorption.
Key words: Ni-Mo ore; tailings; powellite; work of adhesion; pyrene fluorescent probe; electrokinetic potential