Three coals seam of Batu Ayau Formation from Upper Kutai Basin were analyses
in order to determine coal geochemistry characteristic and mineralogy properties.
Coal samples were collected from active mining and have been analysed with
proximate and ultimate coal analysis, Fourier Transform InfraRed (FTIR) and X-Ray
Diffraction (XRD). Geochemically coal has 69.38% of fix carbon (adb), 27.46 % of
volatile matter (adb), 0.99% moisture (adb) and 2.17% ash content (adb). The
ultimate coal analysis shows 85.51?rbon content (adb) and 0.70% total sulphur
content (adb). The coal samples spectra on FTIR analysis indicated the coals are
classified into bituminous in rank. XRD analysis of coal shows minerals content on
coal samples are clays minerals (kaolinite, smectite), silicate minerals (quartz,
sericite, plagioclase and mica), carbonates (calcite, siderite), sulphate (anhydrite) and
sulphides (pyrite).
