阴离子捕收剂浮选一水硬铝石溶液化学机理

Solution Chemical Mechanism of Diaspore Flotation Using Anionic Collectors

利用激光动电位测定一水硬铝石的等电点为pH =6 2。用阴离子捕收剂十二烷基磺酸钠和油酸钠浮选一水硬铝石 ,十二烷基磺酸钠与一水硬铝石以静电作用为主 ,并发生半胶束吸附 ,最佳浮选范围为pH <6 2 ;而油酸钠浮选一水硬铝石时为化学吸附 ,当油酸钠浓度为 1× 10 - 4 mol L时 ,一水硬铝石最佳浮选范围为pH =5～ 9。溶液化学计算得到的油酸钠浮选一水硬铝石的pH值上限和下限与试验结果一致。

The isoelectric point of diaspore in water is determined using laser′s electrokenitic potential. pH of the solution at isoelectric point is 6 2. Diaspore flotation is conducted using sodium dodecyl sulfonate and sodium oleate as collectors. In diaspore flotation using sodiam dodecyl sulfonate, electrostatic effect dominates, with semi micelle adsorption occurring on diaspore surface, and the optimum values for diaspore flotation using sodium dodecyl sulfonate is pH<6 2. In diaspore flotation using sodium oleate, chemisorption of sodium oleate takes place on the diaspore surface. At 1×10 -4 mol/L of sodium oleate, the optimum pH values for diaspore flotation ranges from 5 to 9. The results obtained by chemical calculation show that the upper and lower limits of pH values for diaspore using sodium oleate are in agreement with the test results. From infrared spectra analysis, it is shown that chemisorption of sodium oleate on diaspore surface takes place.