Abstract:

The mineralogical characteristics of the partings in the No.6 coal seam from the Dafanpu Mine of the Jungar Coalfield were studied using analytical procedures including X-ray diffraction (XRD), optical microscope, electron scanning microscope equiped with an energy dispersive X-ray spectrometer(SEM-EDX). The results showed that the main minerals in the partings were boehmite (60%) and kaolinite (40%), which had obvious genetic relations in optical microscope images. The Al-rich area was different from the Si-rich area in SEM-EDX Mapping images. The boehmite was transformed from kaolinite in the desilication. The chemical reaction reacted strongly in the space between crystal layers of kaolinite and strongly around the kaolinite surface.

Key words: Jungar Coalfield, boehmite, kaolinite, high-alumina partings