engleski

High-shear granulation of dolomite

The high-shear granulation of the ground dolomitic limestone represents challenging and recognizable topic of interest in a particle technology community. The aim of this work is to present the impact of the liquid-to-solid ratio and time parameter on the particle size distribution of the obtained dolomite granules. Derived granule size distributions were simulated using a discretised population balance model (Hounslow et al., 1988) and the size independent kernel model (Kapur and Fuerstenau, 1969). Dolomite was used as particulate material with diameter means: d3, 2 of 7, 3  m and d4, 3 of 29, 2  m. Diameter means were measured using the laser diffraction method. A three component system water-molasses-polyvinylpyrrolidone was utilized as a binder formulation. Granulation experiments were performed at a constant temperature in a vertical axis high-shear mixer. During experiments exhibited here, the rotation intensity of the mixer and chopper was set at the constant value. Granule size distribution was determined by sieving and displayed as a normalised mass density function. Series of experiments were repeated at the identical process conditions in order to investigate reproducibility of the granulation experiments. High-shear mixer granulation of dolomite with a three component binder solution yields with bimodal and multimodal granule size distributions. The liquid-to-solid ratio have a significant effect on the granule size distribution. Appliance of the discretised form of the population balance model and size independent kernel model enables good prediction of the PSD's. This study nominates as a good foundation for further kinetic analysis and therefore obtaining more complete quantitative insight into dolomite granulation experiments.

High-shear granulation; Dolomite; Particle size distribution; Population balance

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