原位高效利用湿法磷酸中Mn^(2+)的工艺研究  

Study on in-situ efficient utilization of manganese ion in WPA

作　　者：郭磊 王烨[1,2] 杨贵翔 庄海波 邓强 王辛龙 杨林[1] 张志业[1] GUO Lei;WANG Ye;YANG Guixiang;ZHUANG Haibo;DENG Qiang;WANG Xinlong;YANG Lin;ZHANG Zhiye(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;Yuntianhua Group Co.,Ltd.,Kunming 650228,China;College of Chemistry,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]云天化集团有限责任公司,云南昆明650228 [3]四川大学化学学院,四川成都610065

出　　处：《磷肥与复肥》2019年第3期5-6,10,共3页Phosphate & Compound Fertilizer

基　　金：国家重点研发计划(2016YFD0200404);博士后定向培养计划(No.0003318)

摘　　要：在湿法磷酸生产水溶磷酸一铵的过程中,通过向中和阶段添加螯合剂乙二胺四乙酸二钠(EDTA-2Na),直接生产出含Mn^(2+)的水溶肥,既满足了农作物生长需求,又实现了湿法磷酸中Mn^(2+)的原位高效利用。考察螯合温度、螯合剂添加量和螯合pH对螯合效率的影响。结果表明,在反应温度为30℃,螯合剂添加量为湿法磷酸质量的0.5%,螯合pH为3的条件下,Mn^(2+)的螯合率最高为11.0%。并通过对产品的FT-IR分析,证明了螯合机制为配位反应。In the process of water-soluble monoammonium phosphate produced by WPA,water-soluble fertilizers containing Mn^2+are directly produced by adding EDTA-2Na to the neutralization stage,which not only meets the growth needs of crops,but also realizes the in-situ efficient utilization of manganese ion in WPA.The effects of reaction temperature,the addition amount of EDTA-2Na and chelating pH on chelating efficiency are investigated.Experimental results show that when the reaction temperature is 30℃,the addition amount of chelating agent is 0.5%and chelating pH is 3,the chelating efficiency of Mn^2+is as high as 11.0%.The chelation mechanism is proved to be coordination reaction by FT-IR analysis.

关 键 词：湿法磷酸 螯合 EDTA-2Na MN^2+ 配位 

分 类 号：TQ126.35[化学工程—无机化工]