综合回收利用磷铁的新工艺研究  

New technology for comprehensive recovery and utilization of ferrophosphorus

作　　者：张海燕[1] 李军[1] 王邵东 王涛[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]瓮福(集团)有限责任公司

出　　处：《无机盐工业》2009年第10期50-52,共3页Inorganic Chemicals Industry

摘　　要：提出一种回收利用磷铁的新工艺,并通过实验证明了该工艺的可行性。将磷铁和碳酸钠的混合粉末进行低温和高温两段氧化焙烧使磷和铁分离,然后浸取、过滤,滤液经浓缩、结晶、干燥制得磷酸三钠产品,滤饼经两次逆流洗涤、烘干制得氧化铁红产品。通过正交实验研究了物料配比、焙烧温度、焙烧时间对五氧化二磷转化率和氧化铁红产品中三氧化二铁含量的影响,并回归出模型方程。在最优工艺条件下,五氧化二磷转化率为97.10%,制得的磷酸三钠中十二水磷酸钠质量分数为98.43%,氧化铁红中三氧化二铁质量分数为96.67%。制得符合国家标准的氧化铁红(GB/T 1683—1989氧化铁红颜料)和磷酸三钠产品(HG/T 2517—1993工业磷酸三钠)。New technology for comprehensive recovery and utilization of ferrophosphorus was put forward. Its feasibility has been proved by experiments. In this process ,the mixed powder of ferrophosphorus and sodium carbonate was calcined in low and high temperature two stages under oxygen atmosphere, so as to separate phosphorus and iron. Then through leaching and filtering, the fihrate was turned into trisodium phosphate （TSP） product after condensation, crystallization, and drying. Filter cake was turned into iron oxide red product througb twice countercurrent washing and drying. Meanwhile,influences of technological conditions, such as material mixed ratio, calcining temperature and roasting time on conversion rate of P2O5 as well as on Fe2O3 content of iron oxide red product were investigated by orthogonal experiments and regression model equation was obtained. Under optimal conditions, conversion rate of P2O5 in ferrophosphorus was 97. 10%, content of sodium phosphate dodecahydrote of prepared TSP product was 98.43%, and content of Fe2O3 in iron oxide red was 96.67%. Both of iron oxide red and TSP met GB/T 1683--1989（ Iron Oxide Red Pigment） and HG/T 2517--1993（Industrial Trisodium Phosphate ） , respectively.

关 键 词：磷铁 氧化铁红 磷酸三钠 

分 类 号：TQ131.12[化学工程—无机化工]