Studies on the Thermal Dissociative Process of Microcline

Abstract

Abstract: The microcline CaSO₄-CaO system was determined to be used to obtain K₂SO₄ by thermodynamical analysing and computing lots of possible reactions of 6 microcline systems. The effects of roasting temperature, time and ratios of reactants on the potassium recovery of the microcline CaSO₄-CaCO₃ were studied and the favorable conditions were determined as follow: 1323 K, 3.0 h, m (microcline)∶ m (CaSO₄·2H₂O)∶ m (CaCO₃)=1∶1∶3. In the presence of 0.9% additive I, the roasting temperature decreased from 1323 Kto 1223 Kand the potassium recovery was 84%. Kinetic experimental data of the two systems with or without additive I both fitted a diffusion-through-product-layer-reaction-controlmodel, and their kinetic equations were presented with apparent activation energies 184.4 kJ·mol^-1 and 158.9 kJ·mol^-1 respectively.

Key words: Microcline, Thermal dissociation, Thermodynamics, Kinetics

CLC Number:

TQ443.5

TrendMD:

QIU Long-Hui, WANG Li-Sheng, JIN Zuo-Mei. Studies on the Thermal Dissociative Process of Microcline[J]. Chem. J. Chinese Universities, 1998, 19(3): 345.

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Studies on the Thermal Dissociative Process of Microcline

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