Inorganic Chemicals Industry >
Study on process of preparing α-hemihydrate gypsum by azeotropic reflux method
Received date: 2021-10-08
Online published: 2022-07-14
In order to eliminate the harm of by-product gypsum to the environment and improve the utilization value of by-product gypsum，the azeotropic reflux method was used to take industrial waste acid gypsum as raw material to obtain α-hemihydrate gypsum through slurry preparation，azeotropic solvent addition，crystal conversion reaction，and suction drying，and the best synthesis process of α-hemihydrate gypsum was explored.The product was characterized by X-ray diffractometer（XRD） and scanning electron microscope（SEM）.The effects of azeotropic solvent concentration，temperature，solid-liquid ratio，and pH on the conversion process of by-product gypsum，the composition and structure of the conversion product were mainly researched，and the best experimental conditions were obtained through single-factor experiments and orthogonal experiments.The results showed that when the concentration of azeotropic solvent was 70%，the crystal transition temperature was 120 ℃，the solid-to-liquid ratio was 1∶6，the pH was 5，and the reaction time was 3 h，the aspect ratio could be about 1∶1，and flexural resistance could be obtained.The α-hemihydrate gypsum with a strength（2 h） of 5.6 MPa and a drying compressive strength of 43 MPa met the α40 strength grade of JC/T 2038—2010“α-type high-strength gypsum”.
Cheng XU , Jiefa SHENG , Yuning HAO , Binghui WU , Xiaoming MA , Jianwu LIU , Shenghu YAN , Yue ZHANG . Study on process of preparing α-hemihydrate gypsum by azeotropic reflux method[J]. Inorganic Chemicals Industry, 2022 , 54(7) : 117 -123 . DOI: 10.19964/j.issn.1006-4990.2021-0597
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