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- W1569237967 abstract "The decarbonation of carbonate-fluorapatite (francolite) has been studied in the range 599-747C, at atmospheric pressure. Progressive CO, loss from the apatite is characterized by color change, an increase in crystallinity, and the appearance ofan anomalous z, doublet in the infrared absorption spectrum. Interpretation of the rate data with diffusion theory gives an activation energy of 62.5 kcal/mde and entropy of activation within the limits 3.g to ll.2 cal/mole/deg. Significant deviations from ideal kinetics occur at high fractional CO, losses. Application of the data to the thermometry of the 'Mottled Zone' (Israel) thermal meta- morphism gives 300C as a minimum temperature estimate for the event. Optimum condi- tions are suggested for industrial processes which concentrate phosphorites by roasting." @default.
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- W1569237967 date "1977-01-01" @default.
- W1569237967 modified "2023-09-27" @default.
- W1569237967 title "The decarbonation of carbonate-fluorapatite (francolite)" @default.
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