Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1992-02-28
1993-08-31
Niebling, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
75712, 75726, 75732, 75736, C22B 344
Patent
active
052406873
ABSTRACT:
Geothermal brine is passed through a zone containing a packing metal so as to reduce its tendency to deposit iron/silica scale, reduce corrosivity of the brine, and/or remove and recover metals from the brine. The method polishes the geothermal brine by contacting the brine with a packing metal higher in the electromotive series than silver for a time sufficient for a precious metals to precipitate onto the packing at brine temperature and pH conditions which inhibit iron-rich silica scale. Most preferably, the contacting is accomplished near an injection well at the end of a heat extraction process and the packing comprises coiled zinc-galvanized steel chicken wire mesh packed in a sufficient density to also act as a filter for suspended particles. Alternatively, contacting is also accomplished near the production well. Dissolving the packing in a suitable acid leaves 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 contacted brine is less corrosive than it was before contacting.
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Doty Allen W.
Featherstone John L.
Gallup Darrell L.
Messer Philip H.
Reverente Jessie P.
Bolam Brian M.
Jacobson William O.
Niebling John
Union Oil Company of California
Wirzbicki Gregory F.
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