Abstract
In the processing of the GaAs production, the final yield is often only less than 15% and the remainder of GaAs is wasted as scrap. It is, therefore, very important to recycle the gallium metal from GaAs scrap because this metal is a relatively rare element of importance in the high technology industry. The extraction of gallium from a GaAs scrap with various acids at different stirring speeds, temperatures, and concentrations of acids has been investigated. From these experiments, nitric acid was found to be the most effective extractant. More than 99% of gallium was leached with 2 N HNO 3 at 60°C in 2 h, and the extraction of gallium was believed to be a self-catalytic reaction due to NO 2 gas generated during the reaction. The apparent activation energy of this reaction was found to be about 39.9 kJ/mol.
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