閉鎖型シラスパーライト製造に関する研究

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What is termed "Shirasu perlite" in this report is a bloated glass particle from the Shirasu that is the volcanic ash and is located everywhere in the south of Kyushu. This ash has some interesting bloating characteristics, for instance, preheating treatment with following rapid heating may produce Shirasu perlite with closed-structure, while rapid heating with no preheating is apt to make the one with partly opened-structure.Some results obtained to make the Shirasu perlite with closed-structure-type are summarised as follows;1. The component of the gas to expand the Shirasu during bloating is considered as water from the results of the infrared spectra analysis and the gravimetric analysis.2. Rapidly heated, the Shirasu begins to bloat at about 850°C and keeps on bloating to 1050°C. The temperatures to begin the bloating and softening of the ash which are closely related are also examined.3. Shirasu has two peaks on the dehydration curve determined by T. B., one at about 300°-350°C and the other at 450°-500°C, while the perlite mineral has only one peak at 300°-350°C.4. The higher the heating rate or the larger the particle size, the larger the shift to higher temperature of dehydration curve of the Shirasu. These characteristics of the Shirasu indicate that the heating rate should be correspondingly regulated to its particle size, in order to keep on water enough to expand the ash into sphere until getting to the bloating temperature.According to these results, the continuous production of Shirasu perlite with closed-structure was satisfactorily performed using both a test and a commercial rotary kiln.
社団法人日本セラミックス協会の論文
1973-12-01

閉鎖型シラスパーライト製造に関する研究

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