Chloride leaching of iron-based, heavy metal-containing sludges

Details Chloride leaching of iron-based, heavy metal-containing sludges Chloride leaching of iron-based, heavy metal-containing sludges

1988-07-07

1989-12-19

Hruskoci, Peter

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75114, 423 38, 423 39, 423 40, 423109, 423 94, 423150, 210754, 210913, 210912, 210634, C02F 1100

Patent

active

048880531

ABSTRACT:
A method for removing and recovering toxic heavy metal contaminants from an iron-bearing sludge is provided. The method comprises one or more cycles of a two step, controlled chloride leach comprising a first non-acidic chloride leaching solution and a second acidic chloride leaching solution, wherein said toxic heavy metals are separated from said sludge and said iron-bearing sludge is a substantially non-hazardous material.

REFERENCES:
patent: 1041407 (1912-10-01), Baxteres
patent: 1485909 (1924-03-01), Christensen
patent: 4083921 (1978-04-01), Wesely
patent: 4337128 (1982-06-01), Haakonsen et al.
patent: 4343706 (1982-08-01), Etzel et al.
patent: 4448696 (1984-05-01), White, Jr.

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