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

Abstract

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

CLC Number:

TQ126.3

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.

Figures/Tables 8

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References 16

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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

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

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

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