磷石膏制备轻质石膏砌块新工艺  

A new process for preparation of the lightweight gypsum block

作　　者：骆真 马玉莹[1] 郭元杨 胡勇 张豪 曹宏[1,2] 薛俊 LUO Zhen;MA Yuying;GUO Yuanyang;HU Yong;ZHANG Hao;CAO Hong;XUE Jun(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China;National Engineering and Technology Research Center for Development&Utilization of Phosphorus Resources,Wuhan 430074,China)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205 [2]国家磷资源开发利用工程技术研究中心,湖北武汉430074

出　　处：《应用科技》2020年第5期94-99,共6页Applied Science and Technology

基　　金：湖北省自然科学基金项目(2014CFB788);武汉工程大学科学研究基金项目(K201465);武汉工程大学研究生教育创新基金项目(CX2019082);国家科技支撑计划项目(2013BAB07B05).

摘　　要：为使磷石膏进一步实现大规模无害化应用,本文提出了一种直接以新排含水磷石膏为原料制备石膏砌块的绿色工艺。该工艺可概括为“先成型—再蒸压—后湿养”这3个步骤,其最佳工艺参数为:α-半水石膏与预处理磷石膏质量比为20∶80,泡沫掺量为8%,玻纤掺量为5%,蒸压温度为140℃、保温时间为3 h、湿放养护为7 d。在此条件下制备的轻质石膏砌块其表观密度为784 kg/m^3、断裂荷载3004 N,软化系数0.81,热导率0.16 W/(m·k),水溶性磷、氟低于离子色谱法检测限,对环境无害,为优质轻容重保温砌块。In order to further realize large-scale harmless application of phosphogypsum(PG),a new green process for directly preparing gypsum block from newly discharged water-containing PG is proposed in this paper.It can be summarized as three steps:“first molding-then autoclaving-last wet curing”.The optimum process parameters are:α–hemihydrate gypsum:pre-treated PG=20∶80,foam content of 8%,glass fiber content of 5%,autoclaved temperature of 140℃,holding time of 3 h,wet curing of 7 d.The lightweight gypsum block prepared under this condition has an apparent density of 784 kg/m^3,a breaking load of 3004 N,a softening coefficient of 0.81,and a thermal conductivity of 0.16 W/(m·k).The water-soluble phosphorus and fluorine are lower than the limit of ion chromatography detection,and are not harmful to the environment.It is a high-quality lightweight bulk density insulation block.

关 键 词：磷石膏 轻质砌块 制备工艺 表观密度 断裂荷载 导热系数 保温 无害化处理 

分 类 号：TU551.33[建筑科学—建筑技术科学] TU522.36