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Method of recovering metal by using ion exchange and autoclave reduction

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1. IN RECOVERING A METAL VALUE BY LEACHING METAL-VALUE BEARING SOLIDS WITH A DILUTE AQUEOUS LEACH SOLUTION OF A SOLUBILIZING REAGENT FOR THE METAL VALUE AND TREATING RESULTANT LEACH SOLUTION CONTAINING DISSOLVED METAL VALUE IN A REDUCTION OPERATION WITH A REDUCING GAS AT ELEVATED TEMPERATURES AND SUPERATMOSPHERIC PRESSURES, WHEREBY SAID METAL VALUE IS PRECIPITATED; THE IMPROVEMENT WHICH COMPRISES DEPOSITING DISSOLVED METAL VALUE FROM THE LEACH SOLUTION ON AN ION EXCHANGE BODY; RECYCLING RESULTANT SOLUTION TO SAID LEACHING STEP; ELUTING SAID ION EXCHANGE BODY WITH AN AQUEOUS ELUANT SOLUTION MORE CONCENTRATED IN SOLUBILIZING REAGENT THAN SAID LEACH SOLUTION, THEREBY FORMING A CONCENTRATED SOLUTION OF SAID METAL VALUE; SUBJECTING RESULTANT CONCENTRATED SOLUTION TO SAID REDUCTION OPERATION WITH REDUCING GAS, THEREBY PRECIPITATING DISSOLVED METAL VALUE THEREFROM AND REGENERATING SAID CONCENTRATED ELUANT SOLUTION; REMOVING RESULTANT PRECIPILATE AND RECYCLING RESULANT REGENERATED ELUANT TO SAID ION EXCHANGE BODY.
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