硫酸铝、草酸钾及其共混物对α-半水石膏制备及性能的影响

doi:10.19964/j.issn.1006-4990.2022-0019

摘要/Abstract

摘要：

制备高强石膏是磷石膏资源化的重要途经。为实现磷石膏资源化,采用蒸压水溶液法,以硫酸铝、草酸钾及其共混物为转晶剂,在蒸压温度为130 ℃、保温时间为6 h、液固质量比为0.5条件下制备了α-半水石膏。讨论了不同转晶剂对α-半水石膏形貌和力学性能的影响。结果表明,以硫酸铝为转晶剂时,所制备试样的形貌随转晶剂掺量的增大呈现由针状向长柱状、小晶粒向大晶粒发展的趋势,而以草酸钾为转晶剂制备的试样形貌多为短柱状、晶粒大小不一。当转晶剂总量为石膏量的0.6%、硫酸铝与草酸钾掺量比为5∶1时所制备的石膏试样具有晶粒尺寸大、晶体形貌规整（六方状晶体）的特点,其2 h抗折强度和2 d绝干抗压强度分别可达5.88、36.90 MPa。

关键词: α-半水石膏, 转晶剂, 硫酸铝, 草酸钾

Abstract:

Preparation of high-strength gypsum is an important way to recycle phosphogypsum.In order to realize the recycling of phosphogypsum,the method of autoclaved aqueous solution was adopted by using aluminum sulfate,potassium oxalate and their complexes as crystal modifier to prepare α-hemihydrate gypsum under the conditions of autoclaved temperature of 130 ℃,holding time of 6 h and liquid-solid mass ratio of 0.5.The effect of the different crystal modifier on the morphology and mechanical properties of α-hemihydrate gypsum was discussed.The results showed that the morphology of the samples prepared by using aluminum sulfate as the crystal modifier had a tendency to develop from needle-like to long-column,small-grain to large-grain with the increase of crystal modifier content,but the morphology of the samples prepared by potassium oxalate as the crystal modifier was mostly short columnar and the grain size was different.When the total amount of crystal modifier was 0.6% of gypsum and the ratio of aluminum sulfate to potassium oxalate was 5∶1,the sample prepared by the composite crystal modifier had the characteristic of large crystal grain size and regular crystal morphology（hexagonal crystals）.The 2 h flexural strength and 2 d absolute dry compressive strength could reach 5.88 MPa and 36.90 MPa respectively.

Key words: α-hemihydrate gypsum, crystal modifier, aluminum sulfate, potassium oxalate

中图分类号:

TQ177.373

江瀚宁,李玉平,王志云,温慧敏,叶宝权. 硫酸铝、草酸钾及其共混物对α-半水石膏制备及性能的影响[J]. 无机盐工业, 2022, 54(10): 121-126.

JIANG Hanning,LI Yuping,WANG Zhiyun,WEN Huimin,YE Baoquan. Effect of potassium oxalate and aluminum sulfate and their compounds on preparation and properties of α-hemihydrate gypsum[J]. Inorganic Chemicals Industry, 2022, 54(10): 121-126.

图/表 11

图1

表1

图2

图3

图4

图5

图6

表2

表3

图7

图8

参考文献 15

[1]	张厚记, 宗炜, 郑武西, 等. 工业固废磷石膏复合稳定基层材料研究[J].武汉理工大学学报, 2021, 43(12): 7-12.
	ZHANG Houji, ZONG Wei, ZHENG Wuxi, et al.Composite stabilized base material research of industrial solid waste phosphogypsum[J].Journal of Wuhan University of Technology, 2021, 43(12): 7-12.
[2]	龚丽, 何宾宾, 姜威, 等. 简述磷石膏制备半水石膏的工艺及应用[J].磷肥与复肥, 2019, 34(12): 27-29.
	GONG Li, HE Binbin, JIANG Wei, et al.Review of production process of hemihydrate gypsum from phosphogypsum and its application[J].Phosphate ＆ Compound Fertilizer, 2019, 34(12): 27-29.
[3]	刘伟, 刘永秀, 王琰沛.利用不同磷石膏制备α型半水石膏的研究[J].山东化工, 2019, 48(14): 59-61.
	LIU Wei, LIU Yongxiu, WANG Yanpei.Study on using different phosphogypsum prepared α-hemihydrate gypsum[J].Shandong
	Industry Chemical, 2019, 48(14): 59-61.
[4]	张凡凡, 陈超, 相利学.基于磷石膏的半干法制备α半水石膏试验[J].现代矿业, 2016, 32(10): 72-74, 77.
[5]	耿庆钰, 李建锡, 韩伟明, 等. 磷石膏蒸压制备半水硫酸钙晶须[J].人工晶体学报, 2016, 45(7): 1892-1897, 1905.
	GENG Qingyu, LI Jianxi, HAN Weiming, et al.Preparation of calcium sulfate hemihydrate whisker by phosphogypsum autoclave method[J].Journal of Synthetic Crystals, 2016, 45(7): 1892-1897, 1905.
[6]	韩康, 管学茂, 王燕峰, 等. 加压水溶液法制备工艺对α型高强石膏性能的影响[J].硅酸盐通报, 2021, 40(5): 1620-1630, 1645.
	HAN Kang, GUAN Xuemao, WANG Yanfeng, et al.Effect of preparation process of pressurized aqueous solution method on properties of α-high strength gypsum[J].Bulletin of the Chinese Ceramic Society, 2021, 40(5): 1620-1630, 1645.
[7]	郑万荣, 高洋, 高飞, 等. 加压水溶液法制备α半水石膏技术的几个问题[J].非金属矿, 2007, 30(4): 4-7.
	ZHENG Wanrong, GAO Yang, GAO Fei, et al.Some questions on preparation of α-hemihydrate gypsum with hydrothermal method in pressure[J].Non-Metallic Mines, 2007, 30(4): 4-7.
[8]	LI Xianbo, ZHANG Qin, SHEN Zhihui, et al.L-aspartic acid:A crystal modifier for preparation of hemihydrate from phosphogypsum in CaCl₂ solution[J].Journal of Crystal Growth, 2019, 511: 48-55.
[9]	丁峰, 窦焰, 郑之银, 等. 常压盐溶液-丁二酸转晶体系中pH对α-CaSO₄·0.5H₂O的影响[J].无机盐工业, 2020, 52(1): 82-86, 98.
	DING Feng, DOU Yan, ZHENG Zhiyin, et al.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, 98.
[10]	SINGH N B, MIDDENDORF B.Calcium sulphate hemihydrate hydration leading to gypsum crystallization[J].Progress in Crystal Growth and Characterization of Materials, 2007, 53(1): 57-77.
[11]	SHAO Duoduo, ZHAO Bin, ZHANG Hongqi, et al.Preparation of large-grained α-high strength gypsum with FGD gypsum[J].Crystal Research and Technology, 2017, 52(7).Doi:10.1002/crat. 201700078 .
[12]	张稼祥, 徐玲玲.EDTA对脱硫石膏制备α-半水石膏晶体生长的影响[J].南京工业大学学报:自然科学版, 2018, 40(2): 90-94, 131.
	ZHANG Jiaxiang, XU Lingling.Effects of EDTA on crystal growth of α-hemihydrate gypsum prepared by flue gas desulphurization gypsum[J].Journal of Nanjing Tech University:Natural Science Edition, 2018, 40(2): 90-94, 131.
[13]	胡成, 向玮衡, 陈平, 等. 丁二酸对水热合成α-半水脱硫石膏微晶形貌及力学强度的影响[J].无机盐工业, 2021, 53(4): 76-80.
	HU Cheng, XIANG Weiheng, CHEN Ping, et al.Effects of succinic acid on crystallite morphology and mechanical strength of α-hemihydrate desulfurized gypsum synthesized by hydrothermal method[J].Inorganic Chemicals Industry, 2021, 53(4): 76-80.
[14]	张巨松, 孙蓬, 鞠成, 等. 转晶剂对脱硫石膏制备α-半水石膏形貌及强度的影响[J].沈阳建筑大学学报:自然科学版, 2009, 25(3): 521-525.
	ZHANG Jusong, SUN Peng, JU Cheng, et al.Influence of crystal modifier on morphology and strength of α-hemihydrate gypsum prepared by desulfurization gypsum[J].Journal of Shenyang Jianzhu University:Natural Science, 2009, 25(3): 521-525.
[15]	DUAN Zhengyang, LI Jianxi, LI Tianguo, et al.Influence of crystal modifier on the preparation of α-hemihydrate gypsum from phosphogypsum[J].Construction and Building Materials, 2017, 133: 323-329.

首页

全国无机盐信息中心

中国化工学会

无机酸碱盐专业委员会