常压盐溶液-丁二酸转晶体系中pH对α-CaSO4·0.5H2O的影响

doi:10.11962/1006-4990.2019-0096

Abstract

Abstract:

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.

Key words: phosphogypsum, α-CaSO₄·0.5H₂O, succinic acid, salt solution at atmospheric pressure

CLC Number:

TQ132.32

Ding Feng,Dou Yan,Zheng Zhiyin,Liu Rong,Cui Peng. 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.

Figures/Tables 10

References 16

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序号	反应温度/℃	反应时间/h	丁二酸掺量/%	w（氯化钠）/%	w（α-CaSO₄·0.5H₂O）/%
1	93	3	0.05	5	0
2	93	4	0.10	10	0
3	93	5	0.15	15	0
4	98	4	0.05	15	85
5	98	5	0.10	5	0
6	98	3	0.15	10	0
7	103	5	0.05	10	92
8	103	3	0.10	15	100
9	103	4	0.15	5	0
k₁	0.0	33.3	59.0	0.0
k₂	28.3	28.3	33.3	30.7
k₃	64.0	30.7	0.0	61.7
R	64.0	5.0	59.0	61.7
最优水平	103	3	0.05	15

pH	形貌	长径比	w（α-CaSO₄· 0.5H₂O）/%
2.3	长棒状	8:1~10:1	100.0
6.0	长棒状	8:1~10:1	100.0
7.0	短柱状	3:1~5:1	100.0
8.0	短柱状	1:1~3:1	100.0
9.0	片状和短柱状	—	13.6

晶面	pH	2θ/（°）	d/nm	晶面	pH	2θ/（°）	d/nm
（204）	2.3	31.705	0.281 69	（400）	2.3	29.600	0.301 34
（204）	8.0	31.739	0.281 98	（400）	8.0	29.620	0.301 54

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Inorganic Acid-Base-Salt Committee of CIESC

Effect of pH on α-CaSO₄·0.5H₂O in salt solution at atmospheric pressure-succinic acid crystal transfer system

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Effect of pH on α-CaSO4·0.5H2O in salt solution at atmospheric pressure-succinic acid crystal transfer system