半水石膏固相法转晶制备二水石膏工艺研究  

Research on the process of preparing dihydrate gypsum by crystal transformation of hemihydrate gypsum with solid-phase method

作　　者：陈伟 丁永明 刘利 CHEN Wei;DING Yongming;LIU Li(Guangxi Chuanjinnuo Chemical Co.,Ltd.,Fangchenggang 538000,China)

机构地区：[1]广西川金诺化工有限公司,广西防城港538000

出　　处：《磷肥与复肥》2024年第4期9-11,共3页Phosphate & Compound Fertilizer

摘　　要：对半水石膏转晶制备二水石膏工艺进行实验研究,探究转晶过程中水溶性P2O5、水溶性F、结晶水变化及转晶剂消耗。实验结果表明,加入生石灰可加快半水石膏转晶,实际生产转晶时间可控制在5~7 d;半水石膏在转晶过程中w(P2O5水溶)、w(F水溶)降低至0.1%以下,避免其对下游水泥缓凝剂的质量产生影响;根据石膏中水溶性P2O5含量调整生石灰的加入量,一般生石灰加入量控制在1%~2%。An experimental study is conducted on the process of preparing dihydrate gypsum from hemihydrate gypsum through crystal transformation,the changes of water-soluble POs content,water-soluble F content,crystallization water content,and consumption of crystal transformation agents during the crystal transformation process are explored.The experimental results show that adding quick lime can accelerate the crystal transformation of hemihydrate gypsum,and the actual crystal transformation time can be controlled within 5-7 days;During the crystal transformation process of hemihydrate gypsum,the content of water-soluble P2O,and water-soluble F are reduced to below 0.1%,avoiding their impact on the quality of downstream cement retarders;The amount of quick lime is adjusted according to the water-soluble PO,in gypsum,which is generally controlled at 1%-2%.

关 键 词：半水石膏 转晶 二水石膏 生石灰 

分 类 号：X781[环境科学与工程—环境工程]