- Lead smelting and refining (secondary) (1)
- Gold smelting and refining (secondary) (3)
- Platinum group metals, smelting and refining (secondary) (1)
- Silver recovery from used photographic film (1)
- Aluminum smelting and refining (secondary) (1)
- Brass smelting and refining (secondary) (1)
- Detinning of cans and scrap (1)
- Recovery and refining of nonferrous metals (2)
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