Kinetics of calcium molybdate crystallization

Abstract

Kinetics of crystallization of calcium molybdate from unstirred molten solutions of lithium chloride of low to medium supersaturation in platinum crucibles by the process of continuous cooling at 5° C hr-1 from temperatures T0=700 and 750°C are investigated. The crystal size measured by optical microscopy for different crystallization periods reveals that both crystal length and width generally increase with cooling period. The degree of crystallization αt,also increases with cooling period, attaining a maximum of 0·90. The diffusion rate constants, KDlat 700 and 750°C are 0·0776 and 0·1138 respectively. The effect of variation of the crystallization temperature on the crystal size and their number is also studied. © 1986 Indian Academy of Sciences.