Decomposition of Carbonate Minerals in Spent Oil Shale.

摘要

Cylindrical samples of spent shale,ranging in weight from 0.79to 33.6 g,were heated to temperatures of 685, 850,or 950exp 0 C. The spent shale contained 13to 16wt percent CO sub 2as dolomite (ankerite). In each experiment the weight loss was recorded as a function of time until the sample reached approximately constant weight. The final weight loss and the chemcial analyses before and after the thermal treatment showed that virtually all CO sub 2contained in dolomite is liberated during the heating of spent shale at these temperatures. The decomposition rate of dolomite can adequately be treated with a global,first-order kinetics. The rate of dolomite decomposition in a block of spent shale can be predicted with reasonable confidence by properly accounting for intrinsic kinetics and heat transport effects.