负压蒸馏—结晶工艺处理盐酸酸洗废液  

Treatment of Hydrochloric Acid Pickling Wastewater by Vacuum Distillation-Crystallization Process

作　　者：林艳[1] 李锋超 翟俊[1] 邱福平 赵聚姣 LIN Yan;LI Feng-chao;ZHAI Jun;QIU Fu-ping;ZHAO Ju-jiao(College of Environment and Ecology,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学环境与生态学院,重庆400044

出　　处：《中国给水排水》2020年第23期64-68,共5页China Water & Wastewater

基　　金：重庆市社会事业与民生保障科技创新专项重点研发项目(cstc2017shms-zdyfX0050)。

摘　　要：针对某铁塔厂热浸镀锌车间的盐酸酸洗废液,开发了由预处理、负压蒸馏、冷却结晶、离心脱水4个模块组成的负压蒸馏—结晶组合工艺,并进行了工程应用试验。实验室常压蒸馏试验及Aspen plus 7. 2软件模拟结果表明,在蒸发比例为65%、真空度为0. 065 MPa的条件下处理效果最佳,所得氯化亚铁晶体(FeCl2·4H2O)的纯度达到97. 10%,且盐酸回收率可达到34. 3%。设计并建造了处理规模为6 m3/d的处理站,运行结果表明,处理1 m3废酸液可以回收97. 40 kg的FeCl2·4H2O晶体和0. 40 m3浓度为4%的再生酸,收益可达69. 31元。A vacuum distillation-crystallization combined process consisting of four steps:pretreatment,vacuum distillation,cooling crystallization and centrifugal dewatering was developed to treat hydrochloric acid pickling wastewater from a hot-dip galvanizing workshop of an iron plant,and practical application of this process was conducted.Results of atmospheric distillation experiments and Aspen plus7.2 software simulation suggested that the best performance could be achieved when evaporation ratio was65%and vacuum degree of 0.065 MPa.In this case,the purity of ferrous chloride crystal(FeCl2·4 H2 O)was 97.10%,and the recovery rate of hydrochloric acid could reach 34.3%.A pickling wastewater treatment station with treatment capacity of 6 m3/d was designed and built.The treatment of1 m3 waste acid solution could recover 97.40 kg FeCl2·4 H2 O crystal and 0.40 m3 regeneration acid with concentration of 4%,and the income could reach 69.31 yuan.

关 键 词：酸洗废液 负压蒸馏 结晶 氯化亚铁晶体 回收利用 

分 类 号：TU992[建筑科学—市政工程]