Effects of dry grinding on the structure and granularity of calcite and its polymorphic transformation into aragonite

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• 作者：Tiantian Li^a ; Fengfeng Sui^a ; Fuchun Li^a ; ^{fchli@njau.edu.cn" class="auth_mail} ; Yuanfeng Cai^b ; Zhangdong Jin^c
• 关键词：Calcite ; Aragonite ; Dry grinding ; Structure ; Granularity ; Phase transformation
• 刊名：Powder Technology
• 出版年：March, 2014
• 年：2014
• 卷：254
• 期：Complete
• 页码：338-343
• 全文大小：1221 K

文摘

The structure and granularity of calcite were measured during dry grinding in a ball mill by X-ray diffraction, Fourier transform infrared spectroscopy and laser diffraction, and its morphology was observed by a scanning electron microscope. During the early stage of grinding (0-10 min), the median particle size and X-ray diffraction intensity of the calcite decreased, while the full width at half maximum increased as grinding progressed. During the middle grinding stage (20-300 min), the grain size and crystalline degree of ultrafine calcite particles no longer changed with time; this was attributed to aggregation, which hindered the breakage of particles. During the final grinding stage (360-720 min), a polymorphic transformation of calcite into aragonite took place.