常压下工业副产石膏制备硫酸钙晶须研究进展

doi:10.19964/j.issn.1006-4990.2024-0392

Abstract

Abstract:

With the rapid development of China's industry，industrial by⁃product gypsum（phosphogypsum，flue gas desulfurization gypsum，titanium gypsum，etc.） emissions are growing，a large amount of industrial by⁃product gypsum accumulation will cause serious environmental problems，such as groundwater pollution，soil pollution and so on.Calcium sulfate whisker is often added to other materials as a filler in the industry to enhance performance and other functions，make full use of industrial by⁃product gypsum to prepare high added value calcium sulfate whisker，which can not only protect the environment，but also expand its application range and increase economic benefits.Due to the influence of production technology and equipment，the preparation of calcium sulfate whisker by industrial by⁃product gypsum under normal pressure has not been realized on a large scale.The methods of preparing calcium sulfate whisker from industrial by⁃product gypsum under atmospheric pressure were described and compared，the regulation mechanism of different types of crystal modifier on crystal morphology was described， the influence of impurities in industrial by⁃product gypsum on the crystallization process was introduced.The shortcomings of the current preparation methods of calcium sulfate whisker was summarized，and the future preparation process of calcium sulfate whisker was prospected.

Key words: industrial by?product gypsum, calcium sulfate whisker, atmospheric pressure method, crystal modifier

CLC Number:

TQ177.3

RAO Jiahuan, WEI Jiazhan, DENG Lian, JING Daiyan. Research progress on preparation of calcium sulfate whisker from industrial by⁃product gypsum under atmospheric pressure[J]. Inorganic Chemicals Industry, 2025, 57(5): 46-54.

Figures/Tables 5

Table 1

Fig.1

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Table 2

Fig.3

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样品	w （CaO）	w （Fe₂O₃）	w （MgO）	w （P₂O₅）	w （SiO₂）	w （SO₃）	w （Al₂O₃）
磷石膏	32.25	0.234	0.017	0.643	2.330	43.50	0.163
脱硫石膏	31.51	0.320	0.060		2.690	41.92	0.350
钛石膏	31.20	18.890	1.420	0.034		39.40	2.600
乳酸石膏	33.49	0.009	0.180	0.498	0.049	42.73
天然石膏	31.25	0.480				43.15	0.480

制备方法	优点	缺点
常压酸化法	操作简便，制备硫酸钙晶须时可以同时去除杂质	腐蚀设备及管道，酸性废水排入水体污染环境
常压盐溶液法	操作简便，成本较低	氯盐会腐蚀设备且污染环境，产率低
常压醇溶液法	操作简便，腐蚀性小，便于制备小直径硫酸钙晶须	黏性较大，不易分离，成本较高，产率低
微波辐照法	缩短反应时间，受热均匀	制备过程不易观察，机理不明

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[15]	HAN Qing, LUO Kang-Bi, LI Hu-Ping, ZHANG Ying-Cai, WANG Qi, XIANG Lan. High efficient utilization of phosphogypsum：preparation and application of calcium sulfate whiskers [J]. INORGANICCHEMICALSINDUSTRY, 2013, 45(7): 46-.

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Inorganic Acid-Base-Salt Committee of CIESC

Research progress on preparation of calcium sulfate whisker from industrial by⁃product gypsum under atmospheric pressure

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