| An automatic apparatus for D.T.A. was
installed and calibrated giving good reproducibility
of the results. Preliminary studies
of Hyderabad clays by D.T.A. in their raw
.and washed forms showed that Kamthana
and Shekapur clays were well crystallised
kaolinitic type, the latter indicating the
presence of small amount of dolomite. The
Pachegaon clay was found to be a poorly
crystallised kaolinitic fire-clay with appreciable
quantity of free quartz ( > 20%).
Srirangapur clay exhibited three well defined
sharp endothermic peaks at 150°, 705°, and
885oC corresponding to montmorillonite in
addition to a small endoth~·mic peak for
kaolinite. The D.T.A. data of Chintryal
day revealed the presence of large amount
of free quartz ( > 30%) and complete
absence of kaolinite. |
