文献类型：期刊文献

中文题名：水热环境下磷石膏溶解结晶行为研究

英文题名：Study on hydrothermal dissolution and crystallization behavior of phosphogypsum

作者：郑瑞凯 易芸 刘秋美 杨林 曹建新

第一作者：郑瑞凯

机构：[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

第一机构：贵州大学化学与化工学院,贵州贵阳550025

年份：2026

卷号：58

期号：2

起止页码：83-91

中文期刊名：无机盐工业

外文期刊名：Inorganic Chemicals Industry

收录：;北大核心:【北大核心2023】；

语种：中文

中文关键词：磷石膏;α-半水石膏;石灰改性;溶解度

外文关键词：phosphogypsum;α-hemihydrate gypsum;lime modification;solubility

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。
The phase transformation and influencing factors during the dissolution?recrystallization process ofα-hemihy?drate 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 ofα-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 solubil?ity 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.Pretreat?ment methods such as water washing or lime neutralization could modify the PG′s phase transition behavior to resemble that of natural gypsum.