Effect of Mechanochemical Processing on Illite Particles

摘要

Dry grinding of illite particles has been investigated by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and nitrogen adsorption techniques.Prolonged grinding results in an amorphous illite structure and the mechanochemical effect markedly promotes a reduction in reflection intensities with increased grinding time.It is confirmed that illite is very susceptible to alteration by grinding.The illite crystal size(d_(006))appears to reach a limit after 2 h of grinding.N_2 adsorption studies indicate that illite ground for 8h shows a larger average pore diameter than a sample after 4h grinding or the original illite.It is inferred that grinding is good for the formation of macrostruc-tural pores.Illite grinding results in a decrease in the Brunauer-Emmet-Teller(BET)surface area and total pore volume.IR spectroscopy shows a slight alteration in the illite bands after mechanochemical processing and some new bands were detected after 4 or more hours of grinding.