Method, process, system, and apparatus for recovering metal valu

Details Method, process, system, and apparatus for recovering metal valu Method, process, system, and apparatus for recovering metal valu

1978-11-07

1979-11-06

Andrews, R. T.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204233, 75105, 75118R, 75121, C25C 120, C25C 700

Patent

active

041735196

ABSTRACT:
A method, process, system, and apparatus for recovering metal values such as gold and silver from ores. The process contemplates the prior separation, through appropriate apparatus, of primary slimes from the coarse fraction of ores and each fraction is processed separately and by particular methods most suitable for maximum economic recovery of metal values from each fraction. The coarse fraction materials are routed to constitute one leg of the method to a series of heap-leach piles that are processed in a totally distinct manner by a very low trickle (0.0002 gal/sq.ft./min) of required strength cyanide solution. Metal values are thereby obtained in solution high enough to pass direct to electro-winning cells by-passing expensive intermediate concentrating steps. The primary slime fraction of the ores is routed to constitute a second leg of the process to soak-leach tanks for extraction of metal values without agitation, or by agitation if required, by the carbon-in-pulp adsorption-desorption process with a low cyanide (1 lb. per ton) concentration. In a preferred form of the invention, as to the pregnant solution derived from the heap-leach process and the carbon desorption solution derived through the soak-leach process involving the primary slimes, both are routed to an electro-winning stage for metal values recovery. A sluice box can also be used within the system to provide for separate recovery of large gold particles.

REFERENCES:
patent: 2067014 (1937-01-01), Morris
patent: 2293066 (1942-08-01), Lord
patent: 3357823 (1967-12-01), Tuwiner

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