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A process for the treatment of sludge containing heavy metals generated in electroplating processes has been developed. The process is based on the use of a plasma system and allows the recovery of some of the metals contained in the sludge, while generating totally inert slags as by-products. Experiments performed for the treatment of zinc-rich residues (20% zinc) showed that zinc can be recovered...
A process based on the use of a plasma system for recovering aluminum from dross, beverage cans, and aluminum scrap has been developed. The plasma process is clean, and there is no need for the addition of any compound, such as salt. In principle, a higher recovery rate of aluminum is attainable, since no oxidation of the aluminum occurs during the process. An economic analysis shows that the operating...