- Lead smelting and refining (secondary) (6)
- Zinc smelting and refining (secondary) (1)
- Secondary precious metals (1)
- Gold smelting and refining (secondary) (1)
- Platinum group metals, smelting and refining (secondary) (1)
- Silver recovery from used photographic film (6)
- Aluminum smelting and refining (secondary) (7)
- Bronze smelting and refining (secondary) (1)
- Copper smelting and refining (secondary) (3)
- Magnesium smelting and refining (secondary) (1)
- Recovery and refining of nonferrous metals (5)
