Cadmium

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Cadmium is a troublesome metal for refiners. It is poisonous and creates toxic fumes when scrap containing cadmium is melted. Inhaling cadmium fumes could give metal fume fever.

It is most commonly found in brazes, especially for brazed silver contact points in circuit breakers.

Chemical reactions

Cadmium is easily dissolved in most acids.

Cadmium in the waste stream

Cadmium is one of the RCRA 8 metals so if it is in the waste stream it can inflict higher costs for treatment.

Cadmium in waste water can be precipitated as hydroxide, carbonate, phosphate or sulfide.

The EPA Limits for cadmium both in water and solid waste is 1ppm (mg/l)

References

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