Abstract
This article presents the results of research on the recycling of non-ferrous metals from PCB scrap using melting in metallic lead. The idea of this process is to dissolve (transfer) metals from PCB scrap in lead, and then liquation them by cooling the lead-metals alloy. PCB scrap was crushed and then melted into liquid lead. The lead after process was then poured into the casting mold and its chemical composition was examined. Among the various metals in the PCB scrap, copper and tin in particular are dissolved in lead. The more scrap dissolved in lead, the higher the concentration of copper and tin in the alloy. The highest obtained concentration of copper in lead were about 2.2 wt.%, and for tin about 0.8 wt.%.
Highlights
The methods of recycling non-ferrous metals are conventionally divided into hydroand pyrometallurgical methods [1,2], often preceded by mechanical processing [3,4]
It is based on the solubility of the non-ferrous metals in electronic scrap in lead, followed by liquation to form a concentrate of copper and accompanying precious metals
As a result of melting PCBs in lead, there is no concentration with calcium and ferrous metals, and their concentration in lead is irrelevant from the point of view of liquation
Summary
The methods of recycling non-ferrous metals are conventionally divided into hydroand pyrometallurgical methods [1,2], often preceded by mechanical processing [3,4]. Hydrometallurgical recycling requires the use of various types of acid and/or alkaline solutions, the amount and concentration of which depend on the type of scrap and the intermediate stages of processing. The most important advantage of hydrometallurgy is the possibility of selecting the technological parameters of the stages in such a way as to obtain high recovery efficiency of individual metals, in other word-selectivity. This is, connected with a fairly large number of these steps to separate each metal and with the resulting waste solutions [5,6]. Pyrometallurgy leads to rich metal concentrates that are easy to further process [7–10]
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