石灰と貝灰

抄録

As-recived samples of limestones (from Kuzuu, Tochigi Prefecure) and shells (clams from Ariake) were calcined at 1010°C, crushed and screened, followed by hydrothermal treatment at 110°C in an autoclave. The resultant ashes were analyzed by various methods.
Results obtained are summerized as follows :
(1) Na⁺ ion concentrations were found to be 0.386 ppm in limestones and 67.004 ppm in shells.
(2) The H⁺ ions (proton) were detected in shells by the Ion Micro-analyzer, indicating the presence of organic substances in shells.
(3) Intensity ratios of the powder X-ray diffraction patterns were different, (001) diffraction intensity of the shell ash was extremely larger than that of the lime.
(4) Electron Microscope observations revealed that the lime ash consisted of spindle and irregular-shape particles, while particles in the shell ash mostly had hexagonal plate-shape, and the average particle size of the shell ash was about 10-20 times as large as that of the lime.