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Metal Recovery Using Ion Exchange and Autoclave Reduction (Patent No: 584315)

Inventor: Dasher, John (assignor)

Location: New York, NY

Comments: N/A

Description: Issued September 29, 1959.

John Dasher, New Hyde Park, New York, U.S.A., and Sydney Nashner, deceased, late of Fort Saskatchewan, Alberta, Canada, by his Executor Harry Odie, Summit, New Jersey, U.S.A., assignors to Sherritt Gordon Mines Limited, Toronto, Ontario, Canada. Application April 10, 1958. Serial No. 749,228.
8 Claims.

1. In a process for the recovery of metal values from metal bearing material by leaching the metal bearing material with a leach solution whereby desired metal values are dissolved in the leach solution and are thereafter precipitated from said solution in elemental form by reacting the solution with a sulphur-free reducing gas at elevated temperature and pressure, the improvement which comprises the steps of depositing dissolved metal values from the leach solution on an ion exchange body, eluting said ion exchange body with an aqueous eluent solution more concentrated in leaching reagent then said first mentioned leach solution, thereby forming a concentrated solution of said metal values; reacting resultant concentrated solution with a sulphur-free reducing gas at a temperature and pressure above atmospheric temperature and pressure, thereby precipitating dissolved metal values in elemental form from said solution; and separating precipitated metal in elemental form from said solution.

2. The process according to claim 1 characterized in that leach solution depleted in metal values is withdrawn from the ion exchange body and is re-cycled to the leaching step of the process.

4. The process according to claim 1 or claim 2 characterized in that solution depleted in dissolved metal values is withdrawn from the reduction step of the process, at least a portion of said withdrawn solution is treated for the separation of impurities therefrom and at least a portion of said withdrawn solution is re-cycled to the ion exchange body for use in the elution thereof.

5. The process according to claim 1 characterized in that the leach solution employed in leaching the metal bearing material and the solution employed in eluting the ion exchange body are comprised of different constituent elements.

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