半水-二水法磷酸装置中硫酸钙滤渣及其夹杂磷的状态及演变  

State and evolution of calcium sulfate filter residue and its inclusion phosphorus in a semihydrate-dihydrate phosphoric acid plant

作　　者：刘雁 胡勇 张华丽 郭国清 李志刚 曹宏 龚小梅 LIU Yan;HU Yong;ZHANG Huali;GUO Guoqing;LI Zhigang;CAO Hong;GONG Xiaomei(School of Chemistry and Environmental Engineering,Wuhan Institute of Technology,Wuhan 430073,China;China Wuhuan Engineering Co.,Ltd.,Wuhan 430223,China;National Engineering and Technology Research Center for Development and Utilization of Phosphorus Resources,Wuhan 430074,China;Wuhan R&D Center of Xin'anjie Environmental Sanitation Co.,Ltd.,Wuhan 430070,China)

机构地区：[1]武汉工程大学化学与环境工程学院,湖北武汉430073 [2]中国五环工程有限公司,湖北武汉430223 [3]国家磷资源开发利用工程技术研究中心,湖北武汉430074 [4]新安洁环境卫生股份有限公司武汉研发中心,湖北武汉430070

出　　处：《磷肥与复肥》2021年第11期32-35,37,共5页Phosphate & Compound Fertilizer

基　　金：武汉工程大学研究生教育创新基金(CX2020283)。

摘　　要：对30万t/a半水-二水法磷酸装置副产硫酸钙进行取样,现场阻断其水化,再对其化学组成、物相组成、夹杂磷含量及相互关系进行系统分析。结果表明,在半水工艺段,半水石膏从高浓度磷酸溶液中结晶,致使较多磷被裹入硫酸钙晶格,w(共晶磷)0.56%;在二水工艺段,可水化石膏溶解-再结晶为石膏,此时溶液中磷酸浓度低,因此共晶磷含量显著降低(w(共晶磷)0.01%),再经多次水洗涤实现滤渣夹杂磷降低,也使得半水-二水工艺磷回收率达到了98.2%。The by-product calcium sulfate is sampled from 300 kt/a semihydrate-dihydrate phosphoric acid plant,and its hydration is blocked on site.The chemical composition,phase composition,inclusion phosphorus content and their relationship are systematically analyzed.The results show that in the semihydrate process,the semi-aqueous gypsum crystallizes from the high concentration phosphoric acid solution,resulting in more phosphorus being wrapped into the calcium sulfate lattice,the content of eutectic phosphorus is 0.56%.In the dihydrate process,the hydrable gypsum is dissolved and recrystallized into gypsum.At this time,the phosphoric acid concentration in the solution is low,so the eutectic phosphorus content is significantly reduced(0.01%).After repeated water washing,the low phosphorus inclusion in the filter slag is realized,and the phosphorus recovery rate in the semihydrate-dihydrate process reaches 98.2%.

关 键 词：半水-二水法磷酸工艺 硫酸钙 共晶磷 

分 类 号：X781[环境科学与工程—环境工程]