(中南大學 資源加工與生物工程學院，長沙 410083)
摘 要: 采用二辛基二甲基溴化銨(DDAB)作捕收劑，研究白鎢礦、方解石單礦物的浮選行為和其人工混合礦的浮選分離以及柿竹園白鎢礦的常溫精選。結果表明：在單礦物和人工混合礦的浮選中，DDAB在對白鎢礦的捕收能力和選擇性上均顯著優(yōu)于油酸，其最佳的浮選pH值范圍為8~10；在對柿竹園白鎢礦的常溫精選中，DDAB取得了開路最終浮選精礦WO3品位51.63%, 回收率43.83%的良好指標。這些都證明DDAB是一種新型高效的白鎢礦常溫精選捕收劑。通過對白鎢礦和方解石的表面動電位分析、DDAB的結構分析以及DDAB與白鎢礦作用的紅外光譜分析和量子化學分析，推斷DDAB主要依靠靜電力與白鎢礦表面作用。
關鍵字: 二辛基二甲基溴化銨；白鎢礦；方解石；常溫浮選；分離
（School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The flotation behavior of scheelite and calcite, the flotation separation of artificial mixed minerals with scheelite and calcite and the flotation of ores from Shizhuyuan by using dioctyl dimethyl ammonium bromide (DDAB) were all investigated. The results show that, in the flotation of scheelite, calcite and their artificial mixed minerals, DDAB exhibits a strong collecting and selective ability for scheelite, which is much better than that of oleic acid, and the best separation can be achieved over pH range of 8−10. Also, the grade and recovery of concentrates reach 51.63% WO3 and 43.83%, respectively, in the flotation of scheelite from Shizhuyuan at ambient temperature with DDAB. All above proves that DDAB is a new effective collector for ambient-temperature concentrating scheelite. Furthermore, the mechanism of DDAB interacting with scheelite were investigated through analysis of zeta potentials of scheelite and calcite, FTIR analysis and quantum chemical analysis of the interaction between DDAB and scheelite, and the conclusion was that they interact through electrostatic forces.
Key words: dioctyl dimethyl ammonium bromide; scheelite; calcite; ambient-temperature flotation; separation
