Influence of milling on physical properties of illite
Raw illitic clay (80 % illite, 4 % montmorillonite, 4 % orthoclase, and 12 % quartz) was milled in a planetary ball mill for 0, 60, 120, and 180 min in air. From milled clay, samples for XRD, granulometry, thermogravimetry, DTA, and dilatometry measurements were prepared. It was found that 1) the ph...
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Format: | Tagungsbericht |
Sprache: | eng |
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Zusammenfassung: | Raw illitic clay (80 % illite, 4 % montmorillonite, 4 % orthoclase, and 12 % quartz) was milled in a planetary ball mill for 0, 60, 120, and 180 min in air. From milled clay, samples for XRD, granulometry, thermogravimetry, DTA, and dilatometry measurements were prepared. It was found that 1) the phase composition is almost unchanged by milling; 2) the distribution of grain sizes shows two distinct maxima; the ratio of their areas depends on the milling time – longer milling leads to larger agglomerates; 3) the dehydroxylation of illite is a two-step process: the first step is shifted to lower temperatures with the milling time; the temperature of the second step decreases only slightly with the milling time; 4) the mass loss during both steps of the dehydroxylation slightly decreases with the milling time; 5) the onset temperature of sintering sharply decreases at the longest milling time. |
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ISSN: | 0094-243X 1551-7616 |
DOI: | 10.1063/1.4994489 |