铝合金阳极氧化废酸的再生

Regeneration of waste acid from anodization of aluminum alloy

介绍了铝合金阳极氧化的工艺流程及其污染物的来源。采用离子膜分离技术处理阳极氧化废酸,研究了废酸的初始质量浓度和流量对硫酸回收率和铝离子去除率的影响。当废酸中硫酸的初始质量浓度为160 g/L、废酸流量为1.5 m^(3)/h时,硫酸回收率可达到90.62%,铝去除率达到96.78%,回收所得硫酸可用于配制阳极氧化溶液。

The process flow of anodization for aluminum alloys and the source of pollutants were introduced.The waste acid generated from the anodization of aluminum alloys was treated by ion-exchange membrane separation.The effects of initial mass concentration and flow rate of waste acid on the recovery of sulfric acid and the removal of Al^(3)+ions were studied.The recovery rate of sulfuric acid reached 90.62%and the removal efficiency of Al3+ions was up to 96.78%for a waste acid containing 160 g/L of sulfuric acid initially at a flow rate of 1.5 m^(3)/h.The reclaimed sulfuric acid could be used for the preparation of anodization solution.