Treatment of brine

Details Treatment of brine Treatment of brine

1989-12-29

1992-09-08

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75726, 75732, 75736, 75733, 166267, 210719, 423DIG19, C22B 344

Patent

active

051455153

ABSTRACT:
A method is disclosed for polishing geothermal brines containing iron-rich silica scale and silica particles suspended therein while removing and recovering copper, silver and other precious metals dissolved therein. The method comprises passing brine having a pH just below about 5.0 through a conduit packed with a metal higher in the electromotive series than silver for a time sufficient for a substantial portion of the copper and silver therein to precipitate onto the packing. Preferably, the packing comprises coiled zinc-galvanized steel chicken wire mesh packed in a sufficient density to act as a filter for said suspended particles. Dissolving the packing in a suitable acid will leave a precious metal-rich residue behind for subsequent recovery. When the brine is treated in accordance with this method, the useful life of injection wells used to return cooled brine back to the geothermal field is extended by at least about 3 time as compared to that observed with untreated brine. Further the treated brine is less corrosive than it was before treatment.

REFERENCES:
patent: 3744995 (1973-07-01), MacKay
patent: 4602820 (1986-07-01), Hard
patent: 4756888 (1988-07-01), Gallup et al.

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