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Effect of pH on α-CaSO4·0.5H2O in salt solution at atmospheric pressure-succinic acid crystal transfer system
Received date: 2019-07-18
Online published: 2020-02-26
α-CaSO4·0.5H2O was prepared with phosphogypsum as raw material and succinic acid as crystal transfer by salt solution at atmospheric pressure.The effect of pH on the preparation of α-CaSO4·0.5H2O was studied under the conditions of reaction temperature of 103 ℃,reaction time of 3 h,mass fraction of succinic acid of 0.05% and mass fraction of sodium chloride of 15%.Results showed when the pH was at 7.0~9.0,the short columnar α-CaSO4·0.5H2O crystals that the aspect ratio between 1∶1~3∶1 was obtained.The results of FT-IR and XPS showed that the range of succinic acid ionization out just the right amount of carboxylic acid root complexing adsorption on the Ca 2+ of α-CaSO4·0.5H2O crystal surface when the system was in an appropriate pH range,the growth velocity of the crystal suface was slowed down and the aspect ratio of the crystal was reduced.XRD and TEM characterization results confirmed that carboxylic acid ions were complexated and adsorbed on the（204） crystal surface of α-CaSO4·0.5H2O crystal.
Feng Ding , Yan Dou , Zhiyin Zheng , Rong Liu , Peng Cui . Effect of pH on α-CaSO4·0.5H2O in salt solution at atmospheric pressure-succinic acid crystal transfer system[J]. Inorganic Chemicals Industry, 2020 , 52(1) : 82 -86 . DOI: 10.11962/1006-4990.2019-0096
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