Samples of several natural micas and a synthetic fluorphlogopite were heated at temperatures up to 850°C and then placed in NaCl.NaTPB solutions at 25°C to determine the effect of various heat treatments on the exchange ability of their interlayer K . The maximum degree of K exchange was generally unaltered when the samples were heated but major changes in the rate of ex change occurred. The K in muscovite was released much faster if the.samples were preheated at temperatures above 350°C and even faster if the temperature were raised to 725°C or the time of heating were increased. As a result, nearly complete exchange of K in <50/*muscovite particles was achieved in 1 week in stead of 2 years. On the other hand, the release of K by biotite and lepido melane was retarded by similar heat treatments. Lepidomelane was affected by temperatures as low as 250°C and to such an extent that samples heated at 450°C for 24 hours released only 65% of its K in 2 years instead of all its K in 1 week. Phlogopite was relatively unaffected by temperatures up to 650°C whereas fluorphlogopite exhibited a decrease in rate and degree of K exchange when heated at 450°C.
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