邻苯二甲酸脱除湿法磷酸中金属离子的实验研究  

Experimental study on removal of metal impurities from wet-process phosphoric acid by o-phthalic acid

作　　者：陈以明 柳潇 郝易潇 丁一刚[2] 龙秉文[2] CHEN Yi-ming;LIU Xiao;HAO Yi-xiao;DING Yi-gang;LONG Bing-wen(Hubei Dayukou Chemical Co.,Ltd.,Zhongxiang 431910,China;Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education,Wuhan Institute of Technology,Wuhan 430205,China;Wuhuan Engineering Co.,Ltd.,Wuhan 430223,China)

机构地区：[1]湖北大峪口化工有限责任公司,湖北钟祥431910 [2]磷资源开发利用教育部工程研究中心,武汉工程大学,湖北武汉430205 [3]中国五环工程有限公司,湖北武汉430223

出　　处：《现代化工》2021年第11期164-167,共4页Modern Chemical Industry

基　　金：湖北省重大技术创新专项(2016ACA179)。

摘　　要：湿法磷酸中铁、铝、镁等金属杂质对其下游磷化学品的生产具有极其不利的影响,采用合适的沉淀剂对湿法磷酸进行预处理可简单有效地脱除其中大部分金属杂质。以邻苯二甲酸为沉淀剂对湖北某企业浓缩湿法磷酸进行净化除杂,考察了邻苯二甲酸用量、反应时间和搅拌速率对各杂质离子去除效率的影响。结果表明,当邻苯二甲酸用量为理论值的1.5倍、搅拌线速度为0.2 m/s、常温反应40 min时,湿法磷酸中Fe^(3+)、Mg^(2+)、Al^(3+)和Ca^(2+)的脱除率分别达到了68.94%、55.18%、53.02%和46.9%,反应后磷酸中P_(2)O_(5)质量分数仅下降了2.5%,展现出较好的应用前景。Metal impurities in wet-process phosphoric acid,such as iron,aluminum and magnesium,have significantly negative impacts on production of phosphoric acid-derived chemicals,most of which can be effectively removed by using suitable precipitants in pretreatment.In this contribution,o-phthalic acid is utilized as precipitant to purify the concentrated wet-process phosphoric acid produced in a plant in Hubei province,China.The influences of the addition amount of o-phthalic acid,reaction time and stirring speed on the removal rate of metal impurities are investigated experimentally.It is shown by the results that the removal rates of Fe^(3+),Mg^(2+),Al^(3+)and Ca^(2+)reach 68.94%,55.18%,53.02%and 46.9%,respectively and the concentration of phosphorus pentoxide in the purified phosphoric acid decreases by only 2.5%when the addition amount of o-phthalic acid is 1.5 times the theoretical one,stirring linear velocity is 0.2 m·s^(-1) and the reaction lasts for 40 minutes at room temperature.The results indicate a good practical prospect.

关 键 词：湿法磷酸 金属离子 净化 邻苯二甲酸 

分 类 号：TQ126.35[化学工程—无机化工]