Recovery of metals from grinding sludges

Details Recovery of metals from grinding sludges Recovery of metals from grinding sludges

1983-01-24

1983-10-11

Castel, Benoit

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 75119, 210638, 210912, 423112, 423113, 423130, 423139, 423154, C22C 104, B02F 904

Patent

active

044090200

ABSTRACT:
Metal values, such as Co, Ni, Cu and Fe, are recovered from magnet alloy grinding sludge by means of a process comprising: (1) treatment with an organic solvent to remove a major portion of sulfur and oil contaminants, (2) drying, grinding, sizing and magnetic separation to remove a major portion of grinding media contamination, (3) controlled oxidation-roasting to selectively remove residual sulfur and carbon, and (4) gaseous hydrogen reduction to deoxidize metal values.

REFERENCES:
patent: 3627862 (1971-12-01), West et al.

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