AN EMPIRICAL-MODEL FOR CHLORIDISING-ROASTING OF POTASSIUM IN GLAUCONITIC SANDSTONE

Chloridising-roasting followed by aqua leaching has been used to extra ct potassium from glauconitic sandstone. The investigation includes st udy of the kinetic aspects of roasting and effects of major process va riables. The variables studied are time, temperature, particle size of glauconitic sandstone, and ratio of mixing of calcium chloride and gl auconitic sandstone. An attempt has been made to express the reaction rate as a function of process variables through the use of the followi ng empirical correlations: (a) tau(alpha=0.3-0.8)=5.43x10(-8)(alpha(2. 15). d(1.541)2 . r(-2.03). e(12321/T)) (b) tau(alpha=0.9)=2.6x10(-8)(r (-2.105). e(20377.7/T)) These correlations express the combined effect of different process variables on degree of conversion.