Process for the treatment of incinerated sewage sludge ash

Details Process for the treatment of incinerated sewage sludge ash Process for the treatment of incinerated sewage sludge ash

1979-03-23

1980-08-05

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75105, 75118R, 75121, 210 53, 423 29, 423304, C22B 1108

Patent

active

042160120

ABSTRACT:
A process for the treatment of incinerated sewage sludge ash containing silicic compounds and metal values including phosphorus and at least one precious metal comprises leaching the ash in an acid solution in a first leach to dissolve phosphorus. The leach solution is separated from the undissolved residue, which is then treated to recover at least one precious metal.

REFERENCES:
patent: 1192945 (1916-08-01), Sherwood
patent: 3677741 (1972-07-01), Stenzel
patent: 3969107 (1976-07-01), Lippert et al.
patent: 4110212 (1978-08-01), Krofchak

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