浮选调浆水质环境对气泡粒径分布影响的研究

为研究浮选水质对气泡粒径分布的影响,利用图像分析法测定了不同调浆水质环境下气泡粒径分布特征,研究了Ca^(2+)浓度、Al^(3+)浓度、pH值、水质硬度变化对气泡粒径分布的影响。研究结果表明:随着Ca^(2+)、Al^(3+)浓度的增加,气泡平均粒径减小,当离子浓度达到临界兼并浓度10^(-2) mol/L时,气泡平均粒径保持恒定;随着pH值增大,气泡平均粒径先增大后减小,在pH=7时气泡平均粒径最大,溶液呈酸性(pH<7)时气泡平均粒径大于溶液呈碱性(pH>7)时的气泡平均粒径;随着水质硬度逐渐增大,气泡平均粒径逐渐减小,当水质硬度达到临界兼并浓度600mg/LCaCO_(3)时,气泡平均粒径不再继续减小,之后保持稳定,气泡稳定的平均粒径约为0.45mm。研究结果为浮选调浆调控气泡尺寸、改善气泡矿化效果提供了理论和技术支撑。

Local Measurement of Gas-Liquid Bubbly Flow with a Double-Sensor Probe

A double-sensor probe was used to measure local interfacial parameters of a gas-liquid bubbly flow in a horizontal tube. The parameters included void fraction, interfacial concentration, bubble size distribution, bubble frequency and bubble interface velocity. The authors paid special attention to the probe design and construction for minimizing measurement errors. Measures were also taken in the design of sensor ends for preventing corrosions in the flow. This is an effort to improve the current double-sensor probe technique to meet the ever-increasing needs to local parameter measurements in gas-liquid two-phase flows.