用甲基异丁基甲酮从电子废料中萃取金及条件优化

Investigation of gold purified from electronic waste with methyl isobutyl ketone

以电子废料中的金为研究对象,用统计学方法对甲基异丁基甲酮(MIBK)萃取电子废料中金的影响因素进行了探讨和分析.同时,通过Plackett-Burman实验设计筛选出相比、萃取时间和萃取温度为主要影响因素,并应用响应面方法分析得到了这3个因素的优化结果.数据统计分析结果表明,最佳的萃取条件为相比0.58、萃取时间9.0min、萃取温度20℃,在此条件下金的萃取率最高可达98.36%.萃取液经质量分数5%的草酸溶液还原,反萃金的回收率可达到96.2%.

To improve the extraction of gold from electronic waste,statistical methods were used to analyze the impact of different factors affecting the extraction of Au（Ⅲ） using methyl isobutyl ketone（MIBK） as solvent.The Plackett-Burman experimental design was used to determine the main influencing factors which are phase ratio,extraction time and extraction temperature.Using these three factors as variables,the extraction operation conditions were optimized by Response Surface Methodology（RSM）.The optimum phase ratio was 0.59（water to MIBK）,extraction time 9.0 min and extraction temperature 20℃.Under this optimized condition,the extraction rate of Au（Ⅲ） was 98.36% which was much higher than that under other conditions.The MIBK-Au（Ⅲ） was regenerated with a 5 solution of oxalic acid,and the recovery of stripped gold was 96.2%.