浮选柱气含率及其影响因素对煤泥分选的研究

利用压差法检测浮选柱气含率，通过正交设计和煤泥浮选实验，研究循环压力、进气量和起泡剂浓度对气含率的影响以及气含率对煤泥浮选效果的影响.结果表明，起泡剂浓度对气含率的影响最大，进气量次之，循环压力最小.在一定范围内，随着气含率的增大，精煤产率增大，精煤的灰分也随之增大，精煤质量下降.当气含率为24.17%时，精煤产率为87.35%，精煤灰分为10.02%.随着循环压力增大，精煤产率增大，但精煤灰分有所下降.分析指出气含率大小可作为调节浮选柱矿物分选指标的一个参考标准.

Study of flotation column gas holdup and influence factors to slurry separation

Pressure difference method was used to monitor gas holdup in flotation column. The influences of circulating pressure, air flow and frother concentration on gas holdup and the influence of gas holdup on slurry separation were mainly studied by Orthogonal and slurry flotation experiments. The results show that frother concentration is the most important factor that could affect gas holdup, and air flow is the second, and the circulating pump pressure is the third. The recovery and ash of cleaned coal increase with the increasing of gas holdup in a certain range, so the quality of cleaned coal decline. When gas holdup is 24.17%, the recovery of cleaned coal is 87.35%, and its ash is 10.02%.With the increasing of circulating pressure, the cleaned coal recovery increases, but its ash declines slightly. The gas holdup can be used as a reference standard for regulating the mineral separation indexes of flotation column.