MECHANISM OF PHASE-TRANSFORMATION OF CALCIUM-SULFATE DIHYDRATE TO HEMIHYDRATE IN 2-STAGE WET-PROCESS MANUFACTURE OF PHOSPHORIC-ACIDстатья
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Аннотация:The mechanism of phase transformation of CaSO4.2H(2)O to CaSO4.0.5H(2)O has been studied for separate crystals of inductrial samples [calcium sulfate dihydrate and wet-process phosphoric acid (WPA) were from Khibiny apatite concentrate] under close to industrial conditions (25% P2O5, 9-15% H2SO4; t = 90-95 degrees C). Phase transformation predominantly proceeds by a solid-phase relay mechanism without a phase-transformation front.