油酸钠体系中磁化处理对萤石浮选行为的影响

为了了解油酸钠体系中磁化处理对萤石浮选行为的影响,开展了磁化油酸钠、磁化浮选用水和磁化矿浆情况下的萤石纯矿物浮选试验,并对萤石表面油酸钠的吸附量和Zeta电位进行了研究。结果表明:①在pH=8,油酸钠浓度为1.07×10^-4mol/L,磁场强度为200 mT,油酸钠磁化时间为10 min,水和矿浆均磁化30 min情况下的萤石纯矿物浮选试验的回收率分别为94.48%、93.07%、91.48%,相对于未磁化条件下,回收率分别提高了7.60、6.19、4.60个百分点;同时磁化处理能有效降低油酸钠的用量,且加快萤石的浮选速率,降低选别成本。②磁化油酸钠、水和矿浆均能增大萤石表面的油酸钠吸附量,磁化油酸钠后的吸附量增长最显著,其次是磁化水。磁化处理均能使萤石表面的Zeta电位发生负移,说明磁化处理促进了油酸根离子在萤石表面的吸附。③在人工混合矿浮选试验中,磁化促进了萤石的上浮,未磁化、磁化矿浆、磁化水和磁化油酸钠条件下,萤石精矿品位分别为94.57%、94.70%、94.75%、95.94%,萤石回收率分别为86.60%、89.89%、93.01%、95.35%;磁化矿浆、磁化水和磁化油酸钠相对于未磁化条件下,萤石的回收率分别提高了3.29、6.41和8.75。

Effect of Magnetization Treatment on Fluorite Flotation Behavior in Sodium Oleate System

In order to understand the effect of magnetization treatment on the flotation behavior of fluorite in sodium oleate system， flotation tests of fluorite pure mineral were carried out in the case of magnetized sodium oleate， magnetized flotation water or magnetized pulp. Amount of sodium oleate adsorbed on the surface of fluorite and zeta potential were studied. The results showed that: ①In the condition of pH=8， the concentration of sodium oleate 1.07×10-4 mol/L and the magnetic field intensity 200 mT， the recovery rate of pure mineral flotation tests were 94.48%， 93.07% and 91.48%， when the magnetization time of sodium oleate was 10 min， the magnetization time of flotation water and pulp were 30 min， respectively. The recovery rate of pure mineral flotation tests were 94.48%， 93.07%， and 91.48%， respectively. Compared with unmagnetized conditions， the recovery rate increased by 7.60， 6.19 and 4.60 percentage points， respectively. At the same time， the magnetization treatment can effectively reduce the usage amount of sodium oleate， accelerate the flotation rate of fluorite and reduce the cost of separation. ②All magnetized sodium oleate， water and pulp can increase the amount of sodium oleate adsorbed on the surface of fluorite. The increasing adsorption amount of magnetized sodium oleate is the most significant， followed by magnetized water. All magnetization treatment can negatively shift the zeta potential of the fluorite surface， indicating that the magnetization treatment promotes the adsorption of oleate ions on the surface of the fluorite. ③In artificial mixed mineral flotation tests， magnetization promoted the fluorite flotation. In the conditions of no magnetization， magnetized pulp， magnetized water and sodium oleate， the fluorite concentrate grade were 94.57%， 94.70%， 94.75% and 95.94%， respectively， the fluorite recovery rates were 86.60%， 89.89%， 93.01% and 95.35%， respectively. The recovery rates of fluorite using magnetized pulp， magnetized water and sodium oleate were increased by 3.29， 6.41 and 8.75 percentage points， respectively， compared to unmagnetized conditions.