風化花崗岩に含まれる粘土とその窯業原料としての利用

概要

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Recently, big increase of ceramic product has brought the great consumption of its materials. The author has tried to obtain the ceramic clay from the weathered granitic rocks. At first the forming process and containing situation of clay minerals were surveyed on various rocks at each step of weathering, and then the selection of suitable raw material and extracting method of ceramic clay were investigated.The results of this study are summarized as follows:(1) Among the constituent minerals of granitic rocks, plagioclase and biotite are altered most easily by weathering and kaoline, gibbsite, vermiculite etc. are formed and contained in the weathered rocks.(2) Kaoline is contained in all kinds of weathered and decomposed granitic rocks, even in the rather coarse size range of about 100-150micron.(3) The clay from so called “masatsuchi” can be used as a material of ceramics. Especially, the extremely weathered but not contaminated one provides the clay of higher grade in good yield.(4) In order to get the clay of high quality from the weathered granitic rocks, raw material should be scrubbed softly in water, and the cut size of clay should be as fine as possible. And clay can be made higher grade through magnetic separation.
社団法人日本セラミックス協会の論文
1974-08-01