无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2026, Vol. 58 ›› Issue (2): 83-91.

• 环境·健康·安全 • 上一篇    下一篇

水热环境下磷石膏溶解结晶行为研究

郑瑞凯1,2(), 易芸1,2, 刘秋美3, 杨林1,4, 曹建新1,4()   

  1. 1.贵州大学化学与化工学院,贵州 贵阳 550025
    2.贵州省绿色化工与清洁能源技术重点实验室,贵州 贵阳 550025
    3.贵州理工学院,贵州 贵阳 550003
    4.贵州省废弃物高效利用工程研究中心,贵州 贵阳 550025
  • 收稿日期:2025-01-20 出版日期:2026-02-10 发布日期:2026-03-12
  • 通讯作者: 曹建新(1956— ),男,博士,教授,研究方向为绿色化工;E-mail:jxcao@gzu.edu.cn
  • 作者简介:郑瑞凯(1998— ),男,硕士,主要研究方向为磷石膏资源化利用;E-mail:912932787@qq.com

Study on hydrothermal dissolution and crystallization behavior of phosphogypsum

ZHENG Ruikai1,2(), YI Yun1,2, LIU Qiumei3, YANG Lin1,4, CAO Jianxin1,4()   

  1. 1.School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China
    2.Guizhou Key Laboratory for Green Chemical and Clean Energy Technology,Guiyang 550025,China
    3.Guizhou Institute of;Technology,Guiyang 550003,China
    4.Guizhou Provincial Engineering Research Center of;Efficient Utilization for Waster,Guiyang 550025,China
  • Received:2025-01-20 Published:2026-02-10 Online:2026-03-12

摘要:

研究饱和蒸气压环境下二水石膏水热法制备α-半水石膏的溶解重结晶过程中物相组成的变化及其影响因素,为磷石膏水热法制备α-半水石膏提供一定的参考。使用多种石膏作为原料,在水热体系中探究升温速率、组分及pH对制备α-半水石膏过程的影响,并采用X射线衍射(XRD)、扫描电镜(SEM)等表征手段分析石膏的转晶过程。研究结果表明:磷石膏水热反应最佳升温速率为0.1 ℃/min;在108~130 ℃时,天然石膏、水洗磷石膏、原状磷石膏、石灰改性磷石膏的硫酸钙溶解度总体上均呈现先缓慢增大后减小并逐渐稳定的变化趋势,同时均在118 ℃左右发生转晶;在相同保温条件下,原状磷石膏溶解重结晶生成α-半水石膏的速率比天然石膏与水洗磷石膏更慢、转化率更低,石灰改性磷石膏则具有与水洗磷石膏相似的溶解重结晶行为。磷石膏中所含水溶性杂质是干扰石膏溶解转晶过程的主要因素,通过水洗或石灰中和对磷石膏进行预处理后,其转晶行为与天然石膏类似。

关键词: 磷石膏, α-半水石膏, 石灰改性, 溶解度

Abstract:

The phase transformation and influencing factors during the dissolution-recrystallization process of α-hemihydrate gypsum(α-HH) prepared from dihydrate gypsum(DH) via hydrothermal synthesis under saturated vapor pressure conditions were investigated,providing a reference for the hydrothermal preparation of α-HH from phosphogypsum(PG).Various gypsum sources were employed to examine the effects of heating rate,composition,and pH on the phase transition process,with XRD and SEM used to analyze the crystal transformation.The results indicated that an optimal heating rate of 0.1 ℃/min was determined for the hydrothermal conversion of PG.Within the temperature range of 108~130 ℃,the solubility of CaSO4 in natural gypsum,washed PG,raw PG,and lime-modified PG generally exhibited an initial gradual increase followed by a decrease before stabilizing,with the phase transition occurring near 118 ℃.At the same holding temperature,raw PG demonstrated slower dissolution-recrystallization rate and lower conversion efficiency compared to natural gypsum and washed PG,whereas lime-modified PG exhibited dissolution-crystallization behavior similar to that of washed PG.Water-soluble impurities in PG were identified as the primary factor hindering the dissolution-recrystallization process. Pretreatment methods such as water washing or lime neutralization could modify the PG′s phase transition behavior to resemble that of natural gypsum.

Key words: phosphogypsum, α-hemihydrate gypsum, lime modification, solubility

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