The Recovery of PGMs from Spent Automotive Exhaust Catalysts by Lead Slag

Abstract

This paper presented a novel and environmentally friendly approach for recovering platinum group metals (PGMs) from spent automotive exhaust catalysts. The study employed lead slag and waste graphite electrodes as raw materials, incorporating CaO as an additive to fine-tune the slag’s viscosity and density. By reducing FeO in the lead slag using waste graphite electrodes, pure Fe was obtained, effectively trapping the PGMs from the exhausted catalysts. The study explored the effects of reductant addition, trapping duration, slag basicity, and trapping temperature on the recovery rate of PGMs. The results indicated that a maximum recovery rate of 97.86% was achieved when the reductant was added at 1.5 times the theoretical amount, with a trapping duration of 60 minutes, a slag basicity of 0.7, and a trapping temperature of 1 600 °C. This research offered a greener pathway for the recovery of PGMs from spent automotive exhaust catalysts.

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