Mineralogical and Physical Properties of the Maoming Kaolin from Guangdong Province, South China
Jun Yuan, Haydn H. Murray, 1993. "Mineralogical and Physical Properties of the Maoming Kaolin from Guangdong Province, South China", Kaolin Genesis and Utilization, Haydn H. Murray, Wayne M. Bundy, Colin C. Harvey
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A sedimentary kaolinitic sand deposit near Maoming, Guangdong Province, China has potential as a paper coating clay. Laboratory tests of bulk samples from two major mines in the Maoming deposit, the Shange mine and the Jintang mine, show that the kaolin is composed essentially of well-crystalline, low Fe and Ti, relatively pure kaolinite. The Shange sample has a very fine particle size, high brightness, low viscosity and low abrasiveness, and therefore is suitable for use as a coating clay. The Jintang sample has the quality to be used as a filler clay and with special beneficiation treatments can be processed into coating quality.
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Kaolin is an important industrial mineral in several world markets including uses in paper coating and filling, ceramics, paint, plastics, rubber, ink, fiberglass, cracking catalysts and many other uses (Murray, 1991). The kaolin minerals kaolinite, halloysite, dickite, and nacrite have essentially similar chemical composition but each has important structural and stacking differences. The most common kaolin mineral and the one that is the most important industrially is kaolinite [Al2Si205(OH)4]. Kaolinite can be formed as a residual weathering product, by hydrothermal alteration, and as an authigenic sedimentary mineral. The residual and hydrothermal occurrences are classed as primary and the sedimentary occurrences as secondary. Primary kaolins are those that have formed in situ usually by the alteration of crystalline rocks such as granites and rhyolites. The alteration results from surface weathering, groundwater movement below the surface or action of hydrothermal fluids. Secondary kaolins are sedimentary which were eroded, transported and deposited as beds or lenses associated with other sedimentary rocks. Most kaolin deposits of secondary origin were formed by the deposition of kaolinite which had been formed elsewhere. Some secondary deposits were formed from arkosic sediments that were altered after deposition, primarily by groundwater. There are far more deposits of primary kaolins in the world than secondary kaolin deposits because special geologic conditions are necessary for both the deposition and preservation of secondary kaolins.