Triboelectrification And Discharging Characteristic In Fly Ash

The method of middle carrying capacity capacity and technology is as producing the raw material of building materials in the fly ash comprehensive utilization, and is reducing coke content to the central specification of fly ash. Comparison with flotation, fluidization combustion, electrical separation removing coke techniques has a wide application. The selected coke and tailing fly ash hold more purity, and developing the high efficiency electrostatic separator is the center link to solve the fly ash utilization.The judgment with the rub potential difference, the rub electrification alignment of 10 kinds of bulk materials for: Pb, Zn, Al, Fe and C ( coke or graphite ), Mn, Cu, SiC and Ag ( fly ash ), among them Mn, Cu, SiC and Ag, can make coke component part and the pure ash component part rub in the fly ash give rise to the contrary electric charge.With iron serve as frictional material, adopted pneumatically electrification, specifical charge in coke reduces as solid-gas mass-ratio, pipeline length and air relative Humidity raising, and increases as gas pressure gone up, enlarges of powder fineness.With iron, copper, silver and self-combining silicon carbide and silicon junction silicon carbide serve as frictional material, coke powder and pure fly ash are all taken the negative charge after pneumatically electrification. The pure fly ash rubbed with M material takes positive charge, its largest specifical charge is 14.38μC/g; whereas the coke powder rubbed with petroleum coke material takes negative charge, its largest specifical charge is -0.5μC/g. Both absolute value differ more than 20 times.The electrified powder body loses the electric charge with other materials collision very fast, residual electrical charge in coke is smaller than that in fly ash.