指宿・山川地区白色粘土の基礎的研究

概要

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White clay resources are very abundant in IBUSUKI and YAMAGAWA discrits in Kagoshima prefecture. Chemical analysis, grading analysis, various thermal tests, differential thermal analysis, X-ray analysis, infrared absorption spectra analysis and electron microscopic survey etc., were conducted on the thirteen white clay samples selected in these districts. These clays are exceptionally poor in iron and much in alumina; therefore it is hopeful for ceramic raw materials and filler or coating materials of paper. It is very likely that the main component mineral of these clays is kaolinite and includs quartz, opal and alunite. Among these including minerals, alunite is not preferable for the earthenware raw material by reason of the cause of cracking or bloting of ware on firing. We determined the content of alunite by measuring of weight loss on heating or alkali content of samples. The clays of these districts between the lake Ikeda and the lake Unagi contain much alunite.
鹿児島大学,カゴシマダイガク,Kagoshima Universityの論文