Abstract
The properties and preparation of talc have long been investigated due to its diverse industrial applications, which have expanded recently. However, its comminution behavior is not yet fully understood. Therefore, having better control of the particle size and properties of talc during manufacturing is required. In this study, we investigate the effect of the ball size in a high-energy ball mill on the comminution rate and particle size reduction. High-energy ball milling at 2000 rpm produces ultrafine talc particles with a surface area of 419.1 m2/g and an estimated spherical diameter of 5.1 nm. Increasing the ball size from 0.1 mm to 2 mm increases the comminution rate and produces smaller talc particles. The delamination of (00l) layers is the main comminution behavior when using 1 mm and 2 mm balls, but both the delamination and rupture of (00l) layers occurs when using 0.1 mm balls. The aggregation behavior of ground talc is also affected by the ball size. Larger aggregations form in aqueous solution when ground with 0.1 mm balls than with 1 mm or 2 mm balls, which highlights the different hydro-phobicities of ground talc. The results indicate that optimizing the ball size facilitates the formation of talc particles of a suitable size, crystallinity, and aggregation properties.
Highlights
Talc (Mg3 Si4 O10 (OH)2 ) is a phyllosilicate mineral with a T-O-T layer composed of tetrahedral silicon and octahedral magnesium, which share oxygen and are strongly bonded with each other.The weak van der Waals bonds between the T-O-T layers is the origin of softness of talc
XRDpatterns patterns of of talc talc ground shows the effect of ball size on the crystallinity of ground talc
Increased aggregation could occur in ground talc using 0.1 mm balls due to the loss of in the crystallinity, particle size, and specific surface area of talc, according to the ball size used crystallinity and hydrophobicity
Summary
Talc (Mg3 Si4 O10 (OH)2 ) is a phyllosilicate mineral with a T-O-T layer composed of tetrahedral silicon and octahedral magnesium, which share oxygen and are strongly bonded with each other.The weak van der Waals bonds between the T-O-T layers is the origin of softness of talc. Talc is physically easy to handle due to low hardness, does not react with acid due to its chemical stability, and has high adsorptivity, low plasticity, and low thermal/electrical conductivity. Because of these characteristics, talc is used as a coating, refractory, and additive in various industrial fields such as paper, paint, rubber, ceramic, refractory material, and polymer manufacturing. Chemical and pharmaceutical industries require high-grade talc powders with high purity and uniform particle sizes. The grade and usage of talc is classified considering the purity, whiteness, particle size, and more. Talc with a particle size of 44 μm is used in ceramics and paints, 8–12 μm in paper,
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