No abstract

Five samples of clays from K.amthana, Shekapur, Pachgaon, Srirangpur and Chintriyal were fractionated· by gravitational sedimentation and centrifugation methods to concentrate the clay mineral c.omponents, and the various fractions obtained were subjected to DT A. Shekapur clay. containing large quantities of impurities could be improved considerably by fractionation. The fraction below 2 microns (over 40% of the clay) is mainly kaolinite, free from non-clay minerals and burns white. Most of the quartz present (over 20%) was separ:ated and the presence of illite was de~ec~ed only in finer fractions of Pachgaon and Chintriyal clays. Kamthana and Srirangpur clays showed little improvement.

No abstract

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.• This investigation was undertaken prior to the reorganisation of the States. The Kamthana day deposits are now in the State of Mysore and the other four clays studied are in the Andhra Pradesh.•

No abstract