Process of recovering copper and of optionally recovering silver

Details Process of recovering copper and of optionally recovering silver Process of recovering copper and of optionally recovering silver

1984-08-08

1986-05-06

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 37, 423 42, 423372, 423379, 423383, 75106, 75108, 75117, 75118R, C01G 312

Patent

active

045871108

ABSTRACT:
A process is described by which copper and optionally silver and gold are recovered from sulfide and oxide ores, concentrates or slag, which contain the metals. The particulate materials are treated with an aqueous solution of an alkali cyanide or alkaline earth cyanide, the laden solution is filtered, if desired, a water-soluble sulfide compound is added to the laden solution or filtered laden solution, the laden solution is subsequently adjusted to a pH value below 5 by an addition of acid to precipitate the metal sulfide, which is filtered off, and the resulting hydrocyanic acid is recovered. The process steps of precipitation and filtration of the metal sulfide and the recovery of the free hydrocyanic acid contained in the filtrate are carried out under superatmospheric pressure of 1.5 to 15 bars. The precipitation is preferably effected at a pH value of 1.5 to 2.0. The free hydrocyanic acid is recovered as alkali cyanide or alkaline earth cyanide and is recirculated to the leaching stage.

REFERENCES:
patent: 3189435 (1965-06-01), Lower
patent: 3403020 (1968-09-01), Lower
patent: 4188208 (1980-02-01), Guay

Affiliated with

Also associated with

Rating

Process of recovering copper and of optionally recovering silver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process of recovering copper and of optionally recovering silver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of recovering copper and of optionally recovering silver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1573850