Process for extracting metal values from ores

Details Process for extracting metal values from ores Process for extracting metal values from ores

1988-06-24

1992-12-08

Langel, Wayne

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423 38, 4236585, 423 40, 204109, C25C 100, C22B 300, C22B 1100

Patent

active

051695030

ABSTRACT:
Metal values are solubilized from ore by a lixiviant having a pH from 5 to 8, comprising an aqueous solution of a chloride salt and a hypochlorite salt. Cyanuric acid may be added to retard decomposition of the lixiviant. In one alternative embodiment, any remaining hypochlorite ions are then eliminated by adding hydrogen peroxide or a reducing agent to the pregnant lixiviant. Metal values are recovered by reduction using carbon, electrowinning, or other conventional techniques. In an alternative embodiment for extraction of gold or silver, the steps are combined by using finely ground ore containing sulfides or carbonaceous material to both reduce any remaining hypochlorite ions and precipitate the metal values from the lixiviant. The lixiviant can then be regenerated either by electrolysis or addition of hypochlorite salt.

REFERENCES:
patent: 3461202 (1969-08-01), Robson
patent: 4131454 (1978-12-01), Piret
patent: 4342592 (1982-08-01), Lamb
patent: 4439235 (1984-03-01), Simpson
patent: 4605537 (1986-08-01), Touro
patent: 4723998 (1988-02-01), O'Neil

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