由磷石膏制备柠檬酸钙的陈化分离工艺条件研究  

作　　者：王梦瑜 涂新悦 杨保俊 王百年 

机构地区：[1]合肥中亚环保科技有限公司,安徽合肥230051 [2]合肥工业大学,安徽合肥230051

出　　处：《中国水泥》2024年第6期49-54,59,共7页China Cement

摘　　要：采用“相转移-陈化法”,开展以工业固废磷石膏为原料、NH4Y为相转移剂制备柠檬酸钙水合物的陈化分离工艺条件研究工作。通过单因素条件实验和正交实验,考察并确定较适宜的柠檬酸钙陈化分离工艺条件为:反应时间150min,反应温度90℃,搅拌速率400r/min,此条件下柠檬酸钙水合物沉淀率为92.22%;由FE-SEM及FE-TEM表征可知,优化条件下所制备的柠檬酸钙水合物样品为长约1~10μm,宽约1μm的长方形片状,结合XRD和TG分析结果可知,所制备的柠檬酸钙水合物样品为四水合柠檬酸钙;并以柠檬酸钙水合物为钙源、CO_(2)为碳化沉淀剂碳化沉淀制备样品,由XRD和FE-SEM分析结果可知,所制备样品为方解石型(c)(JCPDS 86-2334)和球霰石型(v)(JCPDS 72-0506)CaCO_(3)的混合相,其形貌为粒径200nm左右的不规则球状。In this dissertation,the“phase transfer-aging”method was used to study the aging separation conditions of caleium citrate hydrate prepared from industrial solid waste phosphogypsum as raw material and ammonium citrate as phase transfer agent.Through single factor experiment and orthogonal experiment,the optimum aging separation process conditions were investigated and determined as follows:aging temperature 90C,aging time 150min,stirring rate 400r/min.Under the optimum condition,the yield of hydrated caleium citrate reached 92.22%.According to FE--SEM and FE-TEM characterization,the prepared calcium citrate hydrate samples under optimized conditions are rectangular sheets with a length of about 1-10μm and a width of about 1μm.The results of XRD and TG analysis show that the prepared caleium citrate hydrate samples are calcium citrate tetrahydrate.The sample was prepared by carbonizing precipitation with caleium citrate hydrate as caleium source and CO_(2) as carbonizing precipitator.The results of XRD and FE-SEM analysis show that the prepared sample is the mixed phase of calcite(c)(JCPDS 86--2334)and aragonite(v)(JCPDS 72-0506)CaCO_(3) and its morphology is irregular spherical with a particle size of about 200nm.

关 键 词：磷石膏 柠檬酸钙 相转移-陈化法 

分 类 号：TQ172.462[化学工程—水泥工业]