粉煤灰中灰颗粒的摩擦带电特征

The triboelectrification characteristics of fly ash component

利用电位差计配合法拉第圆筒测量2种材料的摩擦电势差及电性符号,对10种材料进行了摩擦带电研究,确定了它们的摩擦静电序列为Pb,Zn,A l,Fe,C,Mn,Cu,SiC,Ag,粉煤灰;选出了Mn,Cu,SiC,Ag四种作为粉煤灰摩擦带电电选机的荷电摩擦材料.用0.5 MPa除水压缩空气在铁管中进行气力输送摩擦带电试验,研究了气体流速、管道形式和长度、以及摩擦管道内固气比等因素对粉煤灰摩擦带电量的影响,增大气体流速能显著提高粉煤灰的带电量,而管道长度对灰颗粒的荷质比影响不大.

Faraday cylinder and potential difference meter were adopted to test electric potential difference and electrical sign between binary materials being rubbed. The triboelectrification experiment was conducted among 10 types of materials and the sequence of triboelectrification of them was Pb, Zn, Al, Fe, C, Mn, Cu, SiC, Ag, fly ash. Mn, Cu, SiC, Ag were obtained to be suitable for frictional material in fly ash triboelectrostatic separator. Pneumatic triboelectrostatic experiment was performed in four types of iron pipeline driven by 0. 5 MPa compressed air removed water respectively. The factors of influencing the electrostatic charge on the fly ash such as the gas flow rate, pipeline form and length, the solids-gas ratio were explored. The electrostatic charge on the fly ash was improved enormously with the gas flow rate increased and maintained at a grade with various pipeline lengths.