METHODS FOR TREATING CARBON MATERIALS INCLUDING CARBONACEOUS ORES
First Claim
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1. A method, comprising:
- exposing a carbonaceous feed material comprising at least one metal species to oxidizing conditions selected to produce an oxidized carbonaceous material, wherein the preg-robbing index of the oxidized carbonaceous material is substantially the same as the preg-robbing index of the carbonaceous feed material; and
treating the oxidized carbonaceous material with ozone to produce an ozone-treated carbonaceous material, wherein the preg-robbing index of the ozone-treated carbonaceous material is lower than the preg-robbing index of the oxidized carbonaceous material.
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Abstract
Methods described herein generally relate to the treatment of carbonaceous materials with ozone to facilitate the subsequent recovery of metal species (e.g., precious metals) from the carbonaceous material. In some cases, the method may involve exposure of a carbonaceous material to a relatively low amount of ozone. In some cases, the carbonaceous material may be subjected to oxidizing conditions, e.g. by autoclaving or bio-oxidation, prior to ozone treatment. Such embodiments may allow for more simplified and cost-effective methods for metal recovery.
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Citations
56 Claims
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1. A method, comprising:
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exposing a carbonaceous feed material comprising at least one metal species to oxidizing conditions selected to produce an oxidized carbonaceous material, wherein the preg-robbing index of the oxidized carbonaceous material is substantially the same as the preg-robbing index of the carbonaceous feed material; and treating the oxidized carbonaceous material with ozone to produce an ozone-treated carbonaceous material, wherein the preg-robbing index of the ozone-treated carbonaceous material is lower than the preg-robbing index of the oxidized carbonaceous material. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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2. A method, comprising:
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exposing a carbonaceous feed material comprising a carbonaceous preg-robbing component and at least one metal species to oxidizing conditions selected to produce an oxidized carbonaceous material, wherein the amount of the carbonaceous preg-robbing component of the oxidized carbonaceous material is substantially the same as the amount of the carbonaceous preg-robbing component of the carbonaceous feed material; and treating the oxidized carbonaceous material with ozone to produce an ozone-treated carbonaceous material, wherein the amount of the carbonaceous preg-robbing component of the ozone-treated carbonaceous material is lower than the amount of the carbonaceous preg-robbing component of the oxidized carbonaceous material.
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29. A method, comprising:
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treating a carbonaceous material comprising at least one metal species with about 0.10 grams of ozone per gram carbonaceous material or less to produce an ozone-treated carbonaceous material; treating the ozone-treated carbonaceous material with a chemical reagent to recover the at least one metal species from the ozone-treated carbonaceous material. - View Dependent Claims (30, 33)
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Specification