盐酸溶解磷石膏重结晶制备石膏晶须  

Preparation of gypsum whisker by recrystallization of phosphogypsum dissolved in hydrochloric acid

作　　者：袁科 何思祺 余波 钱诗艺 李汶怡 赵春萌 YUAN Ke;HE Siqi;YU Bo;QIAN Shiyi;LI Wenyi;ZHAO Chunmeng(College of Resources and Environmental Engineering,Mianyang Normal University,Mianyang Sichuan 621000,China)

机构地区：[1]绵阳师范学院资源环境工程学院,四川绵阳621000

出　　处：《化工矿物与加工》2024年第5期16-21,共6页Industrial Minerals & Processing

基　　金：四川省科技厅科技支撑项目(2022NSFSC1072);绵阳师范学院科研基金项目(QD2021A06);四川省教育科学院研究院科研项目(SCJG22A101)。

摘　　要：以工业磷石膏为原料,使用盐酸对其进行溶解,探索了单因素试验条件(盐酸浓度、液固比、反应温度、反应时间)对磷石膏溶解率的影响,得到了磷石膏最佳溶解条件:盐酸浓度4 mol/L、液固比20 mL/g、反应温度80℃、反应时间20 min,在此条件下溶解率为86.12%;探究了控温速率对石膏晶须析出率、产物组分、结晶程度和微观显微形貌的影响规律,结果表明:降温速率差异对石膏晶须析出程度几乎没有影响;4种降温速率(0.40、0.30、0.27、0.20℃/min)下的产物均为二水硫酸钙;石膏晶须的特征衍射峰均较尖锐,形成的晶粒较大,结晶程度较高;随着降温速率的减小,石膏晶须的长径比不断增大、形貌更加均匀。研究成果为工业磷石膏的高值高效利用提供了新思路。Using industrial phosphogypsum as raw material,hydrochloric acid was used to dissolve it,and the influence of single factor experimental conditions on the dissolution rate of phosphogypsum,such as hydrochloric acid concentration,solid-liquid ratio,reaction temperature and reaction time,was explored.The optimal dissolution conditions for phosphogypsum were obtained:hydrochloric acid concentration of 4 mol/L,liquid-solid ratio of 20 mL/g,reactio n temperature of 80℃,and reaction time of 20 minutes.Under these conditions,the dissolution rate was 86.12%;The influence of temperature control rate on the precipitation rate,product composition,crystallization degree,and microstructure of gypsum whiskers was investigated.The results showed that the difference in cooling rate had almost no effect on the precipitation degree of gypsum whiskers;The products at four cooling rates(0.40,0.30,0.27,0.20℃/min)were all calcium sulfate dihydrate;The characteristic diffraction peaks of gypsum whiskers were relatively sharp,resulting in larger grains and higher degree of crystallization;As the cooling rate decreased,the aspect ratio of gypsum whiskers continued to increase and their morphology become more uniform.The research results can provide new ideas for the high-value and efficient utilization of industrial phosphogypsum.

关 键 词：磷石膏 盐酸 溶解率 降温速率 结晶生长 石膏晶须 

分 类 号：TQ132.32[化学工程—无机化工]