磷石膏基复合相变材料的制备及储热性能研究

doi:10.19964/j.issn.1006-4990.2021-0350

无机盐工业 ›› 2022, Vol. 54 ›› Issue (4): 34-39.doi: 10.19964/j.issn.1006-4990.2021-0350

磷石膏基复合相变材料的制备及储热性能研究

李紫瑞^1,³(),邢冬娴^1,³,汤建伟^2,³,王保明^2,³,化全县^1,³,刘丽³,刘咏^1,³()

1.郑州大学化工学院,河南郑州450001
2.郑州大学生态与环境学院
3.郑州大学国家钙镁磷复合肥技术研究推广中心

收稿日期:2021-05-28 出版日期:2022-04-10 发布日期:2022-04-18
作者简介:李紫瑞（1996— ）,男,硕士,从事磷石膏资源化利用的相关研究;E-mail： 1173430006@qq.com。
基金资助:
国家自然科学基金项目(21576246);河南省高校科技创新团队(19IRTSTHN028)

Study on preparation and heat storage performance of phosphogypsum-based composite phase change materials

LI Zirui^1,³(),XING Dongxian^1,³,TANG Jianwei^2,³,WANG Baoming^2,³,HUA Quanxian^1,³,LIU Li³,LIU Yong^1,³()

1. School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China
2. School of Ecology and Environment,Zhengzhou University
3. National Centre of Research & Popularization on Calcium,Magnesium,Phosphate and Compound Fertilizer Technology,Zhengzhou University

Received:2021-05-28 Published:2022-04-10 Online:2022-04-18

摘要/Abstract

摘要：

以磷石膏为原料,采用常压盐溶液法在硝酸镁溶液中制备α-半水石膏,以凹凸棒土和聚氨酯为载体、十水硫酸钠和结晶乙酸钠二元共晶水合盐为相变材料,采用真空吸附法制备定形相变材料,然后将α-半水石膏与定形相变材料复合制备磷石膏基相变材料,并考察了其机械强度和储放热性能。结果表明,由磷石膏制备的α-半水石膏抗折、抗压强度分别为8.9、36.8 MPa,定形相变材料的相变温度为28.5 ℃,相变焓为82.6 J/g。由于掺入相变材料导致石膏晶体结合点减少,磷石膏基相变材料抗压强度降低,但其仍然能够达到建筑石膏的使用要求。升、降温实验结果表明,磷石膏复合相变材料与纯磷石膏保温箱相比,温差为8.9 ℃,具有一定的储能效果。

关键词: 磷石膏, 定形相变材料, 凹凸棒土, 抗压强度

Abstract:

α-hemihydrate gypsum was prepared from phosphogypsum as raw materials in magnesium nitrate solution by the atmospheric salt solution method.With attapulgite and polyurethane used as the carrier,sodium sulfate decahydrate and crystalline sodium acetate binary eutectic hydrated salt used as the phase change materials,the form-stable phase change materials were prepared by the vacuum adsorption method.Then the α-hemihydrate gypsum and the form-stable phase change materials were combined to prepare the phosphogypsum-based phase change materials,and their mechanical strength and heat storage-release properties were investigated.The results showed that the bending strength and compressive strength of α-hemihydrate gypsum prepared from phosphogypsum were 8.9 MPa and 36.8 MPa,respectively.The phase change temperature of the shaped phase change material was 28.5 ℃,and the phase change enthalpy was 82.6 J/g.The compressive strength of the phosphogypsum-based phase change material was decreased due to the reduction of the gypsum crystal bonding points caused by the incorporation of the phase change material,but it still could meet the requirement of the use of building gypsum.The results of the heating and cooling experiments showed that the phosphogypsum composite phase change material had a certain energy storage effect compared with the pure phosphogypsum incubator with the temperature difference of 8.9 ℃.

Key words: phosphogypsum, form-stable phase change materials, attapulgite, compressive strength

中图分类号:

TQ126.3

李紫瑞,邢冬娴,汤建伟,王保明,化全县,刘丽,刘咏. 磷石膏基复合相变材料的制备及储热性能研究[J]. 无机盐工业, 2022, 54(4): 34-39.

LI Zirui,XING Dongxian,TANG Jianwei,WANG Baoming,HUA Quanxian,LIU Li,LIU Yong. Study on preparation and heat storage performance of phosphogypsum-based composite phase change materials[J]. Inorganic Chemicals Industry, 2022, 54(4): 34-39.

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成分	w （CaO）	w （SO₃）	w （MgO）	w （Al₂O₃）	w （Fe₂O₃）	w （P₂O₅）	w （F^-）	w（结晶水）
原状磷石膏	29.57	34.54	1.66	0.43	0.110	1.72	0.40	15.17
预处理磷石膏	30.35	38.31	0.75	0.36	0.086	0.95	0.17	17.22

相变材料	化学式	熔点/℃	相变焓/（J·g^-1）
十水硫酸钠	NaSO₄·10H₂O	32.9	259.2
结晶乙酸钠	CH₃COONa·3H₂O	57.9	254.0

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磷石膏基复合相变材料的制备及储热性能研究

Study on preparation and heat storage performance of phosphogypsum-based composite phase change materials

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