11 Chemical recovery systems for the recovery of metals from waste byproducts, and contaminated solids and recyclable wastes, comprising gasifiers, heat exchangers, burners, boilers, heaters, preheaters, scrubbers, filters, pumps, reactors, mixers, concentrators, electrolyzers, air compressors, air blowers, gas turbines, stream turbines, furnaces, and separators; and separators for the cleaning and purification of aqueous solutions