起泡剂MIBC和BK-201的浮选泡沫特性

Froth characteristic of MIBC and BK-201 frothers

选用非极性基结构不同的起泡剂MIBC和BK-201,利用自制的泡沫性能测试系统,在两相泡沫体系下,测定两相泡沫不同高度处的气泡直径、静压强、表观溢流速度,研究起泡剂对泡沫特征及夹带的影响。结果表明:增加起泡剂浓度,气泡的兼并行为受到抑制,气泡直径逐渐减小;当MIBC浓度超过75 mg/L、BK-201浓度超过150 mg/L时,兼并行为受到显著抑制,气泡直径基本保持不变。在相同的浓度下,相比MIBC,BK-201产生的泡沫气泡直径大、含液率低、水回收速率低。因而,微细粒脉石在BK-201所形成泡沫中夹带更弱,浮选选择性更好。

By using self-designed foam property testing system, two nonpolar base structure frothers, MIBC and BK-201 were chosen to study the influences of frothers on the foam characteristic and entrainment by measuring the bubble diameter, static pressure and apparent flooding velocity in the two-phase foam. The results show that bubble merger degree reduces and air bubble diameter decreases with increasing frothers concentration. When the concentrations of MIBC and BK-201 are more than 75 and 150 mg/L, respectively, the air bubble diameter basically remains unchanged because the merger behavior is dramatically depressed. Under the same concentration, BK-201 generates larger diameter bubble, lower liquid holdup and lower water recovery compared with MIBC. As a result, the foam entrainment of fine gangue is weaker and the selectivity of flotation is better when BK-201 is used.