Hydrometallurgical process for the recovery of lll-V, ll-Vl or l-lll-Vl2 compound semiconductor materials from high-tech or green-tech waste or electrical and electronic waste

摘要

The present invention relates to a wet chemical process for the recovery of metals, which are often only found in low concentration, among other things, as typical III-V, II-VI or I-III-VI2 compound semiconductor materials in high-tech or green-tech Waste, or electrical and electronic waste, occur as rear contacts, such as molybdenum or front contacts, such as TCO's, but also in all non-silicon-based thin-film photovoltaic waste. For this purpose, the mechanically pretreated waste is covered with water and then contacted with sodium bisulfate and sodium chlorite or with methylsulfonic acid and an oxidizing agent, whereby the typical III-V, II-VI or I-III-VI2 compound semiconductor materials go into solution. This is followed by the separation of the solid from the liquid phase and further treatment.