Optimization of low-temperature alkaline smelting process of crushed metal enrichment originated from waste printed circuit boards  

作　　者：郭学益 刘静欣 

机构地区：[1]School of Metallurgy and Environment, Central South University

出　　处：《Journal of Central South University》2015年第5期1643-1650,共8页中南大学学报（英文版）

基　　金：Projects(51074190,51234009)supported by the National Natural Science Foundation of China;Project(2014DFA90520)supported by International Cooperation Program of Ministry of Science of China;Project(20110162110049)supported by the Doctoral Scientific Fund Project of the Ministry of Education of China

摘　　要：A novel low-temperature alkaline smelting process is proposed to convert and separate amphoteric metals in crushed metal enrichment originated from waste printed circuit boards. The central composite design was used to optimize the operating parameters,in which mass ratio of Na OH-to-CME, smelting temperature and smelting time were chosen as the variables, and the conversions of amphoteric metals tin, lead, aluminum and zinc were response parameters. Second-order polynomial models of high significance and3 D response surface plots were constructed to show the relationship between the responses and the variables. Optimum area of80%-85% Pb conversion and over 95% Sn conversion was obtained by the overlaid contours at mass ratio of Na OH-to-CME of4.5-5.0, smelting temperature of 653-723 K, smelting time of 90-120 min. The models were validated experimentally in the optimum area, and the results demonstrate that these models are reliable and accurate in predicting the smelting process.A novel low-temperature alkaline smelting process is proposed to convert and separate amphoteric metals in crushed metal enrichment originated from waste printed circuit boards. The central composite design was used to optimize the operating parameters,in which mass ratio of Na OH-to-CME, smelting temperature and smelting time were chosen as the variables, and the conversions of amphoteric metals tin, lead, aluminum and zinc were response parameters. Second-order polynomial models of high significance and3 D response surface plots were constructed to show the relationship between the responses and the variables. Optimum area of80%-85% Pb conversion and over 95% Sn conversion was obtained by the overlaid contours at mass ratio of Na OH-to-CME of4.5-5.0, smelting temperature of 653-723 K, smelting time of 90-120 min. The models were validated experimentally in the optimum area, and the results demonstrate that these models are reliable and accurate in predicting the smelting process.

关 键 词：low-temperature alkaline smelting waste printed circuit board amphoteric metals central composite design conversion 

分 类 号：TF803[冶金工程—有色金属冶金] X796[环境科学与工程—环境工程]