利用微泡浮选柱从浮选尾矿中回收微细粒级白钨矿

Recovery of fine scheelites from flotation tailings by flotation column

针对湖南安化湘安钨业公司白钨浮选尾矿中微细粒级未能在浮选机中有效分选的特点,研究开发一种微泡浮选柱,该浮选柱采用微孔材质发泡,并利用专家系统控制浮选柱关键工作参数。半工业试验获得了较适宜的柱浮选工作参数:表观矿浆速率为0.27cm/s,表观气体速率为1.35cm/s。工业试验获得的精矿品位可达24.52%,回收率为43.41%,富集比达35.03。水析试验结果表明:5～10,10～19和19～38μm3个粒级的回收率均达到65%以上。试验测得的浮选柱内气泡的Sauter直径为400μm,仅为机械搅拌浮选机气泡的1/3,气泡直径减小促使浮选速率常数k显著增大,这是浮选柱能有效回收微细粒级白钨矿的主要原因。

In order to recover fine scheelites from flotation railings of cleaner circuit, a novel flotation column, which using microcellular material as bubble generator and using expert system to control key work parameters of the column, was manufactured. Pilot and full scale column flotation experiments were carried out, and interrelated work parameters of the column were obtained. The optimum work parameters are as follows： the superficial velocity of the feed 0.27 cm/s and the superficial velocity of air 1.57 cm/s. The recovery of WO3 reaches 43.41% with an average grade of 24.52%, and the enrichment ratio reaches 35.03. The recoveries of three different size fraction, 5-10μm, 10-19μm and 19-38μm, all reach 65%. Sauter diameter of the bubbles in the column is about 400μm, and smaller diameter make the flotation rate constant k increases greatly, improving flotation performance, which is the key reason that fine scheelites can be recovered.