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TRENDS IN THE USE OF LEACHING AGENTS FOR THE RECOVERY OF METALS FROM ELECTRONIC WASTE
Abstract
Waste electronic equipment has become one of the fastest growing waste streams in the world. Mobile phones make up a large proportion of this waste. They cause not only ecological threat, but also a serious waste of resources, including copper. That is why new and effective ways of processing this waste and reusing recovered metals are increasingly being sought. Most modern research on the recovery of non-ferrous and precious metals from mobile phones has focused on hydrometallurgical and biometallurgical techniques. This article presents the impact of ozone on the leaching process of selected metals from printed circuit boards of used mobile phones. The trend of changes occurring during the leaching of e-waste in H2SO4 and HCl using O3, monitored for 20 min, is presented. An increase in the concentration of selected metals in the solution indicates a positive effect of the additional oxidizing agent, which is ozone. Additionally, the results of these e-waste leaching in aqua regia are presented. The purpose of leaching was to check the initial metals content in PCB waste and the content of these metals in samples that had previously been subjected to acid leaching experiments at various parameters. The content of metals after leaching in aqua regia was determined using microwave plasma atomic emission spectroscopy (MPAES) (Agilent MP-AES 4200). Currently, electronic waste is a huge problem worldwide. The continuous development of more reliable, advanced technologies has shortened the life cycle of the product, as a result of which consumers buy new electronic devices while rejecting old ones. Old, useless electronic devices are thrown away. These activities have led to an increase in the amount of electronic waste in the world. Electronic waste, including mobile phones, contain many valuable metals, including copper, gold, silver, palladium and others
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