K_2SO_4溶液对磷石膏中晶须生长及结晶过程的影响  

The impact of K_2SO_4 solution on phosphogypsum whisker growth and crystallization process

作　　者：蹇守卫[1] 孙孟琪[1] 郅真真 马保国[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《功能材料》2015年第24期24043-24047,共5页Journal of Functional Materials

基　　金：国家科技支撑计划资助项目(2011BAJ03B03)

摘　　要：以预处理后的磷石膏为原料,以K_2SO_4为添加剂,采用常压水溶液法制备石膏晶须,研究K_2SO_4溶液浓度对磷石膏溶解度和晶须长径比的影响,在此基础上,探讨了磷石膏晶须的生长机理。结果表明,K_2SO_4溶液的浓度对晶须的组成和微观结构存在显著影响,在0.1 mol/L时没有发现晶须的生成,而在K_2SO_4浓度达到0.3 mol/L时,生成CaSO_4·2H_2O和K_2Ca(SO_4)_2·2H_2O的混合晶须,长径比为73~120;晶须随时间变化的研究结果表明,与普通的CaSO_4·2H_2O生长机理类似,K^+对晶须的轴向生长具有促进作用。Pretreated with phosphogypsum as raw materials,K_2SO_4 as additive,study of the impact of K_2SO_4 solution with different concentrations on whisker growth of phosphogypsum by the atmos-pheric water solution method. On this basis,explores the growth mechanism of phosphogypsum whiskers. The results show: the concentration of K_2SO_4 solution have significantly effect on whis-ker composition and microstructure. In 0. 1 mol / L whisker can not be found,when it reaches to 0. 3 mol / L,the sample generates CaSO_4·2H_2O and K_2Ca(SO_4)_2·2H_2O mixing whiskers,large aspect ratio between 73-120; the results which study of whiskers change with time-varying show that the growth mechanism was similar to ordinary CaSO_4·2H_2O and K^+ can promote the growth of whiskers.

关 键 词：K2SO4 磷石膏 晶须 生长 

分 类 号：TB34[一般工业技术—材料科学与工程]