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1MECHANISM OF PHASE-TRANSFORMATION OF CALCIUM-SULFATE DIHYDRATE TO HEMIHYDRATE IN 2-STAGE WET-PROCESS

I S Sirota,Sergey V Dorozhkin,M V Kruchinina,V N Rudin,I V Melikhov

1993引用：23

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2MECHANISM AND METHODS OF CONTROLLING CONVERSION RATE OF CALCIUM-SULFATE DIHYDRATE INTO SEMIHYDRATE I

I S Sirota,Sergey V Dorozhkin,M V Kruchinina,V N Rudin,I V Melikhov

1993引用：22

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3The Mechanism and Ways of Monitoring the Rate of Phase Transition of Calcium Sulfate Dihydrate into the Semihydrate in Sulfophosphoric Acid Media

I. Sirota, S. V. Dozozhkin,M. Kruchinina,V. N. Rudin,I. Melikhov

1993引用：23

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4MECHANISM OF PHASE-TRANSFORMATION OF CALCIUM-SULFATE DIHYDRATE TO HEMIHYDRATE IN 2-STAGE WET-PROCESS MANUFACTURE OF PHOSPHORIC-ACID

IS SIROTA,SV DOROZHKIN,MV KRUCHININA,VN RUDIN,IV MELIKHOV

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.

1993RUSSIAN JOURNAL OF APPLIED CHEMISTRY（1993）

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5Pulse regulation of the phase transition of calcium sulfate dihydrate into the semihydrate under con

I S Sirota,Sergey V Dorozhkin,M V Kruchinina,V N Rudin,I V Melikhov, P V Klassen

1993引用：23

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6Pulse regulation of the phase transition of calcium sulfate dihydrate into the semihydrate under conditions of two-stage EPA production

I. S. Sirota,Sergey V. Dorozhkin,M. V. Kruchinina,Vsevolod Nikolaevich Rudin,I. V. Melikhov, P. V. Klassen

1993Russian chemical industry引用：23

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7Influence of impurities on the phase transition of calcium sulfate dihydrate into the semihydrate in sulfophosphoric acid solutions

I. S. Sirota,Sergey V. Dorozhkin,M. V. Kruchinina,I. V. Melikhov

1993Russian chemical industry引用：23

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8Mechanism of the phase transition of calcium sulfate dihydrate into the semihydrate under conditions of two-stage production of extraction phosphoric acid

I. S. Sirota,Sergey V. Dorozhkin,M. V. Kruchinina,Vsevolod Nikolaevich Rudin,I. V. Melikhov

1993Russian chemical industry引用：23

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9Mechanism of the phase transition of calcium sulfate dihydrate into the semihydrate under conditions

I S Sirota,Sergey V Dorozhkin,M V Kruchinina,V N Rudin,I V Melikhov

1993引用：23

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10Influence of impurities on the phase transition of calcium sulfate dihydrate into the semihydrate in

I S Sirota,Sergey V Dorozhkin,M V Kruchinina,I V Melikhov

1993引用：22

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11MECHANISM AND METHODS OF CONTROLLING CONVERSION RATE OF CALCIUM-SULFATE DIHYDRATE INTO SEMIHYDRATE IN SULFURIC PHOSPHORIC-ACID SOLUTIONS

IS SIROTA,SV DOROZHKIN,MV KRUCHININA,VN RUDIN,IV MELIKHOV

The kinetics and mechanism of conversion of crystalline CaSO4.2H2O (DH) into CaSO4 . 0.5H2O (SH) have been studied on samples of analytically pure grade under near-industrial conditions (18-27% P2O5, 4-12% SO3, t = 90-97-degrees-C). The methods developed for effectively controlling the conversion rate of DH into SH have an impact on the initial step (induction period) through an impulse alteration of the solution composition and temperature and through seeding with SH crystals.

1993RUSSIAN JOURNAL OF APPLIED CHEMISTRY（1993）

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12Phase Transformation and Dehydration of Calcium Sulphate Dihydrate in Solution Studied by SEM

IS SIROTA,SV DOROZHKIN,MV KRUCHININA,IV MELIKHOV

The transformation of separate crystals of CaSO4.2H2O (DH) into CaSO4.0.5H2O (HH) in an aqueous solution of H3PO4 and H2SO4 at 90-97-degrees-C was studied using a JSM-35CF SEM. The source DH and acids were reagent or commercial (taken from the production of H3PO4 by a wet process). DH was allowed to convert into HH and periodic samples of the suspension were drawn, filtered, and investigated in the solid phase by SEM. It was shown that the dehydration of reagent DH specimens occurred through the recrystallization mechanism, whereas the transformation of commercial DH into HH was basically topochemical and developed by a relay race mechanism without any phase transformation front. The observed difference between commercial and reagent DH specimens may be explained by differences in their crystalline structure, initial particle size and by the presence of impurities in DH and acids. It is established that chemical impurities can change the mechanism of the phase transformation of the crystals DH into HH.

1992SCANNING（1992）引用：8

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