島根県石見地方に産する低品位粘土原料の性質と合成瓦坏土への利用

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The traditional Sekishu roofing-tiles have been made from the raw clays occurring in the Tsunodu formation of the Neogene age. These clays consist mainly of disordered kaolinite, quartz and feldspar, accompanied by a small quantity of mica clay minerals and halloysite. The properties of three types of low quality clays, two are of sediment origin and the one is red color altered granite, were investigated in order to utilize them as potential raw materials for the preparation of compound roofing-tile bodies, since the raw clays of good quality tend to be steeply exhausted. As a result, it was found that these clays have functional uses for making compound bodies, although they are lack in shaping ability, individually. The one of sedimentary clays, characterized by dark brown color owing to the accumulation of humic substances, is advantage to improve the plasticity of compound bodies, because it is rich in the finer particle-size fractions and contains a small quantity of smectite. The other one, abundant in quartz and feldspar with coarser particle size, found the uses as non-plastic material and fluxing material. The red color clay, in which gibbsite and halloysite form dominantly, resembles the existent raw clays in chemical composition and is characterized by remarkably small size-changes in firing. The compound body blended by the red color clay with the black color clay at the rate of 1:3 showed the thermal property about equal to that of the raw clays in present use for the roofing tiles.
帝京科学大学の論文
2005-03-31

島根県石見地方に産する低品位粘土原料の性質と合成瓦坏土への利用

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