- Lead smelting and refining (secondary) (1)
- Secondary precious metals (1)
- Gold smelting and refining (secondary) (1)
- Platinum group metals, smelting and refining (secondary) (3)
- Silver recovery from used photographic film (1)
- Silver smelting and refining (secondary) (1)
- Aluminum smelting and refining (secondary) (1)
- Babbitt metal smelting and refining (secondary) (2)
- Copper smelting and refining (secondary) (2)
- Detinning of cans and scrap (1)
- Magnesium smelting and refining (secondary) (1)
- Recovery and refining of nonferrous metals (2)
- Tin smelting and refining (secondary) (1)
