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In response to the rapidly increasing demand for recovery of valuable metals from waste containing metals, we have developed two methods by adopting rotary kilns for metal recycling. The first method is improvement of a rotary kiln to a high-load, high-performance roasting furnace. We have succeeded in economically recovering nickel, vanadium and molybdenum from spent catalysts. The commercial plant has been operated with high efficiency to recover rare metals. The second method is recovery of iron and zinc from the electric furnace dust. Refuse plastics are utilized as both fuel and reduction agent in the rotary kiln. The stable operation has been confirmed through the demonstration test and it is expected to enable an economical recycling.
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