浮选精煤热压过滤干燥脱水机理与脱水动力学研究

Mechanism and kinetics of flotation concentrate thermo-compression filtration-drying dewatering

针对细粒浮选精煤深度脱水问题,提出了包括热压过滤和热压干燥过程的热压过滤干燥脱水工艺。结合理论与实验研究了脱水的机理与脱水动力学,指出热压过滤形成饱和滤饼之后进行的热压干燥过程是伴随饱和蒸汽脱水面X(t)和过热蒸汽脱水面Y(t)的形成与扩散,进一步深度脱除滤饼水分;该过程可一次性将浮选精煤悬浮液分离成清澈滤液和含水分12.15%的干燥粉煤,同传统热力干燥脱水工艺相比节约能耗59.31%。

According to the in-depth dewatering of fine flotation concentrate,a theoretical and experimental study was made to investigate the mechanism and kinetics involved in the innovative thermo-compression filtration-drying integrated process.It is pointed out that after a saturated filter cake is formed,the thermo-compression drying process can further reduce the cake moisture along with the formation and diffusion of the saturated steam dewatering surface X（t） and superheated steam dewatering surface Y（t）.Through this dewatering-drying integrated process,a clear filtrate and a final dry concentrate product with a moisture content of 12.15% can be produced.As compared with conventional thermal drying process,the energy consumption can be reduced by 59.31%.