用蒸压法将磷石膏制备α半水石膏的研究  

The research of using phosphogypsum manufacture of α-semi-hydrated gypsum by autoclaved method

作　　者：罗东燕 邱树恒[1] 陈霏 杨志明 蒋江[1] 黄静[1] 孙保玉 曾思成[1] 

机构地区：[1]广西大学材料科学与工程学院,广西南宁530004 [2]广西建筑材料科学研究设计院,广西南宁530022

出　　处：《新型建筑材料》2015年第9期23-26,46,共5页New Building Materials

基　　金：广西科技攻关计划项目(桂科攻12118014-3C)

摘　　要：采用经水洗、浮选、筛分处理后的磷石膏,通过蒸压法制备α-Ca SO4·0.5H2O。以蒸压温度、蒸压时间及料浆含水率为因素,进行3因素3水平的正交实验,以力学性能为指标找出最优实验方案,并研究转晶剂作用下制备α半水石膏的效果。结果表明:蒸压温度140℃、蒸压时间8 h、料浆含水率30%时,可以制得7 d干抗压强度达22.16 MPa的α半水石膏;掺入硫酸铝和明胶作为复合转晶剂时,得到长径比约为2∶1的短柱状晶体,适宜掺量分别为0.6%和0.06%时,制品抗压强度达到30.71 MPa。The article uses phosphogypsum which washed,selected and sieved to prepare α-CaSO4·0.5H2O by autoclaved method. Formulate orthogonal test of three factors and thred levels containing steam temperature,time and moisture content of slur- ry,then to find the optimal scheme under index of mechanical properties, and study the effect of crystal modifier. Experiment re- suits showed that：when the moisture content of the slurry is 30%,keeping autoclaved time of 8 hours under 140℃ can obtain α- semi-hydrated gypsum which 7 d dry compressive strength is 22.16 MPa： mixing compound crystal modifier（aluminum sulfate and gelatin） which suitable content is 0.6% and 0.06% can obtain short columnar crystals that length to diameter ratio is about 2：1, compressive strength is 30.71 MPa.

关 键 词：磷石膏 蒸压法 α—CaSO4·0.5H2O 转晶剂 强度 

分 类 号：TU526[建筑科学—建筑技术科学] TQ177.375[化学工程—硅酸盐工业]