氟石膏水化活性改性试验研究  

Experimental Study on Hydration Activity Modification of Fluorgypsum

作　　者：薛璐韬 李育彪 吴晓勇[1,2] 李瑞 孙旭超[1,2] 吴开振[1,2] 池汝安 XUE Lutao;LI Yubiao;WU Xiaoyong;LI Rui;SUN Xuchao;WU Kaizhen;CHI Ru’an(Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources,Ministry of Education,Wuhan 430070,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Three Gorges Laboratory,Yichang 443000,China)

机构地区：[1]关键非金属矿产资源绿色利用教育部重点实验室,武汉430070 [2]武汉理工大学资源与环境工程学院,武汉430070 [3]湖北三峡实验室,宜昌443000

出　　处：《硅酸盐通报》2025年第1期223-230,共8页Bulletin of the Chinese Ceramic Society

基　　金：湖北省科技重大专项(2022ACA004-6);湖北三峡实验室创新基金项目(SC232019)。

摘　　要：氟石膏的强酸性与较低水化活性限制了其在抹灰石膏领域的应用,为解决这一难题,本文选用CaO、Ca(OH)_(2)为中和剂,Na_(2)C_(2)O_(4)、Na_(2)SO_(4)、K_(2)SO_(4)、K_(2)SiO_(3)、半水石膏为激发剂,对氟石膏水化活性进行改性,探究中和剂与激发剂种类、掺量对改性效果的影响。结果表明:3%(质量分数)的中和剂可以将氟石膏pH值提高至9左右,并使氟石膏中游离氟含量维持在0.02%(质量分数)左右,基于成本考虑,选择价格更低的CaO为中和剂;K_(2)SO_(4)、Na_(2)SO_(4)和半水石膏作为激发剂均有较好的激发效果,其中Na_(2)SO_(4)激发效果最好,经1.0%(质量分数)Na_(2)SO_(4)激发制备的抹灰石膏初凝时间为119 min,终凝时间为252 min,抗压强度为10.30 MPa,抗折强度为3.85 MPa,各项指标均达到《抹灰石膏》(GB/T 28627—2023)的要求。The high acidity and low hydration activity of fluorgypsum restrict its application in the field of plastering gypsum.In order to solve this problem and promote the large-scale application of fluorgypsum in plastering gypsum,CaO and Ca(OH)_(2) were selected as neutralizer while Na_(2)C_(2)O_(4),Na_(2)SO_(4),K_(2)SO_(4),K_(2)SiO_(3)and gypsum hemihydrate were selected as activator,to modify fluorgypsum.The effects of type and dosage of activator and neutralizer on modification effect were investigated.The results show that 3%(mass fraction)neutralizer can improve the pH value of fluorgypsum to around 9 and keep its free fluorine content around 0.02%(mass fraction).Considering the cost,the cheaper CaO is choose as neutralizer.In addition,K_(2)SO_(4),Na_(2)SO_(4)and gypsum hemihydrate as activator have good excitation effect,among which Na_(2)SO_(4)has the best excitation effect.Plastering gypsum excited by 1.0%(mass fraction)Na_(2)SO_(4)is prepared,with initial setting time of 119 min and final setting time of 252 min.Moreover,the compressive strength is 10.30 MPa while the flexural strength is 3.85 MPa.It should be noted that all indicators reach the requirements of“Plastering gypsum”(GB/T 28627—2023).

关 键 词：氟石膏 中和剂 激发剂 凝结时间 抗压强度 抗折强度 水化率 

分 类 号：TQ177.3[化学工程—硅酸盐工业]