铝件抛光剂废液中铝浓度检测和除铝研究  

Study on Aluminum Concentration Detection and Aluminum Removal in Waste Liquid of Polishing Agent for Aluminum Parts

作　　者：杨庆 黄颖 杨军星[1] YANG Qing;HUANG Ying;YANG Jun-xing(Qiannan Nationality Professional Technology College,Guizhou Duyun 558022;Guilin University of Technology,Guangxi Guilin 541004,China)

机构地区：[1]黔南民族职业技术学院,贵州都匀558022 [2]桂林理工大学,广西桂林541004

出　　处：《广州化工》2022年第22期135-137,145,共4页GuangZhou Chemical Industry

基　　金：环境保护公益性行业科研专项(201709001-08);广州市科技计划项目(201508020008)。

摘　　要：以铝件抛光剂废酸液为原料,检测废液铝离子浓度及除铝研究。采用氢氟酸沉淀铝离子,再用硝酸镁去除剩余氟,避免氟腐蚀酸回收设备。结果表明,去除总铝离子高达94.6%以上,除铝曲线线性系数r=0.994;EDTA返滴定法测铝,槽液中铝含量计算为5.4V 2(g/L),V 2是0.1 mol/L硫酸铜置换Al-EDTA络合物的铝而消耗的硫酸铜体积,铜(Ⅱ)的前后消耗量指示铝浓度的变化,它们存在良好的负相关关系,线性系数r=-0.9959。此法可根据铝离子浓度及去除量,定量投加氢氟酸除铝;最后将余氟去除,可实现抛光剂的回收。既避免了大量废酸的排放,也为铝件抛光剂的回收工艺提供一定的应用指导。Using the waste acid solution of polishing agent for aluminum parts as raw material,the concentration of aluminum ions in waste solution was detected and the aluminum removal was studied.Hydrofluoric acid was used to precipitate aluminum ions,and then magnesium nitrate was used to remove the remaining fluorine,and avoid fluorine corrosion acid recovery equipment.The results showed that the removal of total aluminum ions was more than 94.6%,and the linear coefficient of aluminum removal curve r=0.994.For aluminum measurement by EDTA backtitration,the aluminum content in the tank was calculated as 5.4V 2(g/L),and V 2 was the volume of copper sulfate consumed by replacing aluminum in Al-EDTA complex with 0.1 mol/L copper sulfate.The consumption of copper(Ⅱ)before and after indicated the change of aluminum concentration,and they had a good negative correlation,linear coefficient r=-0.9959.This method can be based on the concentration and removal amount of aluminum ions,adding hydrofluoric acid quantitative aluminum removal.Finally,the residual fluorine can be removed to realize the recovery of polishing agent.It not only avoided the discharge of a large amount of waste acid,but also provided some application guidance for the recovery process of aluminum polishing agent.

关 键 词：铝件抛光剂 除铝 回收 返滴定法测铝 

分 类 号：TQ153.6[化学工程—电化学工业]