DC arc furnaces, leveraging their high-temperature enrichment and low-loss characteristics, have become the core equipment for recovering precious metals from three-way catalytic converters, solving the challenge of resource utilization for automotive exhaust purification waste. Three-way catalytic converters contain rare precious metals such as platinum, palladium, and rhodium, but their carrier, Al2O3, is difficult to separate from carbon deposits and impurities. Traditional processes suffer from high pollution and low recovery rates.
The process involves first crushing the catalytic converter to 200 mesh, mixing it with flux lime powder to make balls. Then it is sent to a DC arc furnace with a temperature exceeding 1600 ° C for melting. During the process of melting the raw materials, metallic iron is added to the furnace as a capturing agent. At high temperatures, aluminum oxide and calcium oxide form low melting point calcium aluminate, while precious metals are effectively captured by metallic iron to form alloys. Alloys can be refined and separated in subsequent processes.
Extraction of Precious Metals from Automotive Three-Way Catalysts
Extraction of Precious Metals from Automotive Three-Way Catalysts
Extraction of Precious Metals from Automotive Three-Way Catalysts
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