硫酸体系氧化浸出清洁回收废弃电路板中铜的研究  

A Clean Process of Recovering Copper from Waste Printed Circuit Board by Air-oxidation and Sulfuric Acid Leaching

作　　者：秦红[1] 刘静欣[1] 刘旸[1] 田庆华[1] 李栋[1] 郭学益[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《金属材料与冶金工程》2013年第6期24-29,共6页Metal Materials and Metallurgy Engineering

基　　金：国家自然科学基金面上项目(51074190);湖南省自然科学基金资助项目(No.14JJ3017)

摘　　要：提出一种清洁的从废弃电路板中回收铜的工艺,绘制了Cu-H2O系电势-pH图。该工艺原料为废弃电路板经物理法分离得到的多金属粉末,采用空气氧化在硫酸体系中对多金属粉末进行氧化浸出,然后采用冷却结晶法提取浸出液中的铜。结果表明:优化浸出条件为浸出温度65℃,硫酸浓度为1 mol/L,空气流量80 mL/min,搅拌速度350 r/min,液固比20∶1,浸出时间5 h;在此条件下,铜的浸出率达99%;采用一次冷却结晶得到的硫酸铜晶体,硫酸铜含量达97.82%,达到GB437-80一级标准。该工艺流程简单、过程清洁、具有可行性。A novel process was developed for the separation and recovery of copper from the waste Printed Circuit Board( PCB) and the potential-pH diagram of Cu-H2O was drawn. By using crushed metal enrichment separated from waste Printed Circuit Board as raw materials, air was insufflated into solution as oxidant for copper leaching, then the copper was extracted by cooling crystallization. The results show that the leaching recovery of copper reaches 99%, under the condition of leaching temperature 65 ℃, H2SO4 concentration of 1 mol / L, air flow of 80 mL / min, stirring rate 350 r / min, the ratio of liquid to solid 20 ∶ 1 and the leaching time 5 h. Copper sulfates were prepared by cooling crystallization only once and with high purity of 97.82%, up to the grade of 437-80. The experiment proves that extracting from waste Printed Circuit Board in H2SO4 using air as oxidizing agent is briefness, clean and highly effective.

关 键 词：废弃电路板 铜 空气氧化 回收 

分 类 号：X76[环境科学与工程—环境工程]