减压反应蒸馏去除热镀锌FeCl2污泥中的Cl^-  

Removal of Cl from hot-dip galvanized FeCl sludge by vacuum reactive distillation

作　　者：黄东霖 李国清 Huang Donglin;Li Guoqing(College of Chemical Engineering and Materials Science,Quanzhou Normal University,Quanzhou 362000,China)

机构地区：[1]泉州师范学院化工与材料学院,福建泉州362000

出　　处：《无机盐工业》2020年第8期72-75,共4页Inorganic Chemicals Industry

基　　金：泉州师范学院化工与材料学院创新基金项目。

摘　　要：由于Cl^-对植物的生长具有很高的"氯毒害",而热镀锌Fe Cl2污泥中Cl^-的含量极高,因此不能直接作为一般废物最终处置。采用减压反应蒸馏去除Fe Cl2污泥中的Cl^-,由于Fe Cl2水解生成的HCl被减压蒸馏带出、Fe(OH)2在空气曝气作用下氧化成Fe(OH)3,经过滤干燥后形成水合氧化铁(Fe2O3·n H2O)。实验中首先在自制的减压反应蒸馏装置中进行3因素4水平正交实验研究,随后做单因素优化实验研究。减压反应蒸馏去除Fe Cl2溶液中Cl^-的优选工艺条件:Fe Cl2浓度为1.50 mol/L、加热温度为75℃、反应蒸馏时间为120 min,系统真空度控制在0.06 MPa,Cl^-的去除率达85.5%。将优选的工艺条件应用于热镀锌Fe Cl2污泥中Cl^-的去除,其去除率可达84.0%。Cl^-has been high chlorine toxicity to growth of the plants,and the content of Cl^-in hot-dip galvanized FeCl2 sludge is very high,so it can not be directly disposed as general waste.In this experiment,Cl^-in Fe Cl2 solution was removed by vacuum reactive distillation.At the same time,HCl gas was formed by hydrolysis of FeCl2 and taken out by vacuum distillation,the Fe(OH)2was oxidized to Fe(OH)3 by air during aeration.And then ferric oxide hydrate(Fe2O3·nH2O)was obtained by filtering and drying.The removal of Cl^-from FeCl2 solution was designed as 3 factors and 4 levels to carry out orthogonal tests,and the single factor tests were studied.The optimum technological conditions for removal of Cl^-from FeCl2 solution by vacuum reactive distillation were as follows:FeCl2 concentration was 1.50 mol/L,heating temperature was 75℃,reactive distillation time was 120 min and vacuum degree was 0.06 MPa.Under the conditions,the removal efficiency of Cl^-was up to 85.5%.When the optimum technological conditions were applied to removal of Cl^-from hot-dip galvanized FeCl2 sludge,the removal efficiency of Cl^-reached 84.0%.

关 键 词：热镀锌FeCl2污泥 Cl^-的去除率 减压反应蒸馏 水合氧化铁 

分 类 号：TQ138.11[化学工程—无机化工]