Mechanochemical effect of talc during fine grinding process in a jet mill

Palaniandy, Samayamutthirian and Azizli, Khairun Azizi Mohd (2009) Mechanochemical effect of talc during fine grinding process in a jet mill. International Journal of Mineral Processing, 92 1-2: 22-33.


Author Palaniandy, Samayamutthirian
Azizli, Khairun Azizi Mohd
Title Mechanochemical effect of talc during fine grinding process in a jet mill
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2009-07-01
Sub-type Article (original research)
Volume 92
Issue 1-2
Start page 22
End page 33
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Fine grinding testwork of talc was carried out in a jet mill by varying the feed rate, classifier rotational speed, and grinding pressure at five levels. In this jet mill, grinding and classification took place simultaneously. The ground products were characterized in terms of particle size distribution and mechanochemical effect via X-ray diffraction and infrared spectroscopy (IR). The ground product exhibited poly-modal distribution, thus its particle size was characterized by volume moment diameter. Coarser particle size distribution was obtained at a higher classifier rotational speed due to the fluctuation of inside mill condition and particle characteristics, which deviated from Stokes' law. The optimum feed rate, classifier rotational speed, and grinding pressure for talc were 12 kg/h, 7000 rpm, and 6 bar, respectively. Ground talc exhibited mechanochemical effect where the degree of crystallinity ranged from 26.5% to 85.3%. Talc ground at 4 kg/h, 13,000 rpm, and 6 bar exhibited massive mechanochemical effect where the degree of crystallinity was 27.6%. The crystallite size and lattice strain of talc ranged from 147.69 nm to 353.72 nm and 0.08 to 0.2, respectively. Reduction of hydroxyl Si–O–Mg and hydroxyl band for talc were observed via IR.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Tue, 22 Nov 2011, 21:23:50 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre