无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2020, Vol. 52 ›› Issue (8): 72-75.doi: 10.11962/1006-4990.2019-0517

• 环境·健康·安全 • 上一篇    下一篇

减压反应蒸馏去除热镀锌FeCl2污泥中的Cl-

黄东霖(),李国清()   

  1. 泉州师范学院化工与材料学院,福建泉州 362000
  • 收稿日期:2020-02-16 出版日期:2020-08-10 发布日期:2020-08-12
  • 通讯作者: 李国清
  • 作者简介:黄东霖(1996— ),男,学士,从事废物的资源化利用研究;E-mail: 421449085@qq.com
  • 基金资助:
    泉州师范学院化工与材料学院创新基金项目

Removal of Cl- from hot-dip galvanized FeCl2 sludge by vacuum reactive distillation

Huang Donglin(),Li Guoqing()   

  1. College of Chemical Engineering and Materials Science,Quanzhou Normal University,Quanzhou 362000,China
  • Received:2020-02-16 Online:2020-08-10 Published:2020-08-12
  • Contact: Li Guoqing

摘要:

由于Cl-对植物的生长具有很高的“氯毒害”,而热镀锌FeCl2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FeCl2污泥中的Cl-,由于FeCl2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·nH2O)。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FeCl2溶液中Cl-的优选工艺条件:FeCl2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FeCl2污泥中Cl-的去除,其去除率可达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

Abstract:

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 FeCl2 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)2 was 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%.

Key words: hot-dip galvanized FeCl2 sludge, removal efficiency of Cl-, vacuum reactive distillation, ferric oxide hydrate

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