Method of processing an iron-containing dust obtained in the pre

Details Method of processing an iron-containing dust obtained in the pre Method of processing an iron-containing dust obtained in the pre

1986-08-01

1987-12-15

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423 92, 423 98, 423101, 423109, 423150, 423632, C01G 4902

Patent

active

047132230

ABSTRACT:
Iron is recovered from an iron-containing dust obtained in processing iron or steel by dissolving iron and bivalent metals present in the dust in an acid. Subsequently the iron is precipitated as iron hyroxide by adding an alkaline substance or ammonia to adjust the pH to 5 to 8. Before or during precipitation of any iron the bivalent metal ions present, such as zinc, cadmium and lead, are converted into a soluble complex by the addition of a complexing agent, preferred complexing agents being polyamines, particularly triethylene tetramine. The process may be conducted more than once in the same solution, thereby providing a final solution containing considerable amounts of zinc, cadmium, or other bivalent metals, which may be separated by boiling or precipitation.
The complexing agent may be recovered by distillation after having made the complexes strongly alkaline or by precipitation by adjusting the pH to 1 and recovering the salt of the complexing agent such as a hydrochloric acid salt of the complexing agent.

REFERENCES:
patent: 3375069 (1968-03-01), Duval
patent: 4124462 (1978-11-01), Reinhardt et al.
patent: 4317804 (1982-03-01), Ichijo
patent: 4500498 (1985-02-01), Kruesi et al.
patent: 4572771 (1986-02-01), Duyvesteyn et al.

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