engleski

Comminution kinetics od premullite powder

Pre-mullite powder has been synthesized by sol-gel process. Differential thermal analysis (DTA) of the powder yielded scan with two exotherms: stronger at ~980°C and weaker at ~1200°C. Using X-ray diffraction (XRD) analysis it has been determined that first exothermic peak is a consequence of Al-Si spinel crystallization, while second peak occurs due to mullite crystallization. The powder was wet milled in planetary ball mill within various time intervals. The particle size distribution of ground samples has been determined using particle size analyzer (PSA). Comminution kinetics of calcined pre-mullite gel is modeled using a classical batch grinding equation based on selection and breakage functions. Analysis of experimental data resulted with model suitable for prediction of particle size distribution of calcined amorphous gel comminuted in planetary ball mill if the duration of grinding is no longer than 128 min.

pre-mullite gel; planetary mill; particle size distribution; grinding kinetics

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