(1. 西南科技大學 固體廢物處理與資源化教育部重點實驗室，綿陽 621010；
2. 中南大學 資源加工與生物工程學院，長沙 410083)
摘 要: 通過浮選試驗、接觸角測定后礦物顆粒黏著功的計算以及芘熒光探針檢測，考察捕收劑油酸鈉對鉬酸鈣及磷灰石的浮選性能。結果表明：在堿性條件下，兩種礦物的浮選行為相似，浮選回收率均可達到80%以上，油酸鈉對鉬酸鈣和磷灰石有很好的捕收性能。六偏磷酸鈉用量達到220 mg/L時，鉬酸鈣的回收率為62.5%，而此時磷灰石的回收率僅有20.3%，兩種礦物的可浮性差異顯著增加。油酸鈉可以顯著增加兩種礦物顆粒的黏著功，使其更易向氣泡粘附并上浮。六偏磷酸鈉顯著擴大兩種礦物的表面疏水性差異，優(yōu)化其浮選分離條件。油酸鈉在鉬酸鈣及磷灰石表面未形成膠束、半膠束吸附和非靜電吸附，而是化學吸附。
關鍵字: 鎳鉬礦；尾礦；鉬酸鈣；黏著功；芘熒光探針；動電位
（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
