Process for recovery of metal values from sludges

Details Process for recovery of metal values from sludges Process for recovery of metal values from sludges

1980-09-09

1982-11-23

Peters, G. O.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75118R, 423 1, 4236585, 110346, C22B 1500

Patent

active

043603807

ABSTRACT:
A process for the recovery of selected metal values from silica containing sludges including incineration of the sludge to degrade organic components, followed by acid leaching of the ash, followed by hydrometallurgical recovery of metal values from the remaining solid and liquid residues, wherein the incineration step is carried out at a temperature below the slagging temperature of silicates, whereby to avoid the occluding of metal values in glass matrices which are not attacked by subsequent acid leaching and hydrometallurgical steps.

REFERENCES:
patent: 1818846 (1931-08-01), Giles
patent: 4033763 (1977-07-01), Markels
patent: 4162294 (1979-07-01), Witzke
patent: 4216012 (1980-08-01), Krofchak
"The Removal and Recovery of Metals from Sludge and Sludge Incinerator Ash", Barry G. Oliver and John H. Carey-Ontario Ministry of Environment, Pollution Control Branch, 135 St. Clair Avenue, West, Toronto, Ontario, Canada M4V 1P5-Feb. 1976, pp. 3 and 44.

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