Abstract
This paper describes released gas analysis of manganese wad from Akan, Kogane and Niimi. The samples were heated by the infrared image furnace in He gas condition, and mass spectra of released gas phase were measured by Q-mass spectrometer. Experimental results show that(a) the detected phases on heating are H2O, N2, O2 and CO2, (b) the volume of CO2 mainly depends on the species of manganese mineral, and(c) O/Mn ratio of manganese wad was varied widely and there is a negative correlation between O/Mn ratio and crystallinity. The above features are mostly depend on the amorphous part of the managanese wad. As X-ray diffraction method is insufficient for amorphous phase, gas analysis can provides an important data for study of manganese wad. Manganese wad from Akan (Akan-2) shows unique charactaristics.(a) Akan-2 does not release O2 gas on heating in He gas condition.(b) The structure deforms on heating at 42°C.(c) The DTA data shows a exothermic peak at 300°C.
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