共沸回流法制备α-半水石膏工艺研究
收稿日期: 2021-10-08
网络出版日期: 2022-07-14
基金资助
工信部产业技术基础公共服务平台(2020-0107-3-1)
Study on process of preparing α-hemihydrate gypsum by azeotropic reflux method
Received date: 2021-10-08
Online published: 2022-07-14
为消除副产石膏对环境的危害，提高副产石膏的利用价值，采用共沸回流法以工业废酸石膏为原料，经过浆料配制、投加共沸溶剂、转晶反应以及抽滤烘干得到α-半水石膏，并对α-半水石膏的最佳合成工艺进行了探究。通过X射线衍射仪（XRD）、扫描电镜（SEM）对产物进行表征。重点研究了共沸溶剂浓度、温度、固液比、pH对副产石膏的转晶过程、转晶产物组成及结构的影响，并通过单因素实验以及正交实验得到最佳实验条件。结果表明：在共沸溶剂体积分数为70%、转晶温度为120 ℃、固液质量比为1∶6、pH为5、反应时间为3 h时可以制得长径比约为1∶1、抗折强度（2 h）为5.6 MPa、烘干抗压强度为43 MPa的α-半水石膏，满足JC/T 2038—2010《α型高强石膏》α40强度等级。
徐成 , 沈介发 , 郝宇宁 , 吴炳辉 , 马晓明 , 刘建武 , 严生虎 , 张跃 . 共沸回流法制备α-半水石膏工艺研究[J]. 无机盐工业, 2022 , 54(7) : 117 -123 . DOI: 10.19964/j.issn.1006-4990.2021-0597
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”.
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