中文摘要：

采用Na2 CO3-NaOH-NaNO3熔盐体系回收废弃电路板中的有价金属,考察Na2 CO3-NaOH质量比、熔炼温度、熔炼时间、碱料比等因素对有价金属转化率的影响.结果表明,较为适宜的熔盐体系组成和工艺条件为：Na2CO3-NaOH质量比5.3∶16、熔炼温度700℃、熔炼时间40 min、碱料比5∶1,在此条件下,锡、锌、铝、铅的转化率分别为84.55％、100％、93.71％、73.72％,铜以CuO形态富集在渣中.

英文摘要：

Valuable metals were recovered from multi-component metal powder （MMP） of waste printed circuit boards in alkaline oxide melt system of Na2CO3-NaOH-NaNO3.The effects of mass ratio of Na2CO3-NaOH,smelting temperature and time,mass ratio of alkaline medium-MMP on valuable metal extraction were investigated.The results show that composition of molten salt and optimum conditions include mass ratio of Na2CO3-NaOH of 5.3 ∶ 16,smelting temperature of 700 ℃,smelting time of 40 min,and mass ratio of alkaline medium-MMP of 5 ∶ 1.The transforming rate of tin,zinc,aluminum,and lead are 84.55％,100％,93.71％,and 73.72％,respectively.Copper is enriched in slag in form of CuO.