Impact of Operating Parameters on the Breakage Process of Talc
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Impact of Operating Parameters on the Breakage Process of Talc Diler Katircioglu-Bayel 1 Received: 23 May 2019 / Accepted: 16 July 2020 # Society for Mining, Metallurgy & Exploration Inc. 2020
Abstract This manuscript aimed to examine the impact of operating parameters on the wet grinding of talc in a vertical-type stirred media mill. Within the scope of the research, the effects of operating parameters including media filling ratio, solid mass fraction, grinding media size, and grinding time were studied. The findings were assessed based on the product particle size (d50, d10), surface area (Sw), and energy consumption (Em). As a result of the present research, the following optimum grinding test conditions were determined: 65% media filling ratio, 40% solid mass fraction, 1 mm grinding media size, and 120 min grinding time. After determining the optimum grinding conditions, the Box–Behnken statistical design was used to determine the effect of parameter interactions on the d50 size. The media filling ratio was found to significantly affect the decrease in d50 compared to the other two parameters. Furthermore, the minimum d50 size was also achieved under optimum grinding conditions. Keywords Vertical stirred media mill . Talc . Wet grinding . Submicron particles
1 Introduction In recent years, the consumption of industrial mineral products in the submicron range in areas such as pigments, paints, paper coatings, adhesives, cosmetics, ceramics, catalysts, and waterproofing materials has increased substantially. However, it is very difficult to ensure the production of particles in this size range by grinding, and submicron grinding is an expensive process due to low mill capacity and high energy consumption. Talc represents a hydrated magnesium silicate and has a chemical formula of Mg3Si4O10(OH)2. It consists of octahedral magnesium oxide sandwiched between hydrophobic tetrahedral silica layers. The layers are linked to each other by weak van der Waals forces. Talc is soft because of the easy displacement of these layers [1]. The properties of talc (platyness, chemical inertness, softness, hydrophobicity, creep resistance, organophilicity, and mineralogical composition) provide specific functions in many applications, and because of these features, talc is known to be a reinforcing filler [2]. Much research has been conducted on the use of talc in the paper, agricultural, food, ceramics, and coating industries, and its use as a stabilizer in plastics and wastewater treatment * Diler Katircioglu-Bayel [email protected] 1
Department of Mining Engineering, University of Nigde Omer Halisdemir, Nigde, Turkey
[3–11]. Because of its structural properties, talc is considered a better mineral filler in applications than other mineral fillers. Submicron talc particles have been investigated in different applications, including polymer nanocomposites [12–15], intumescent fire retardant coating [16, 17], and semicrystalline plastics [18]. Dry mills are commonly used to grind talc particles [19–24]. However, wet mill
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