| 摘要 |
<p>PRESSURE OXIDATION METHODS FOR GOLD EXTRACTION AND TOXIC WASTE TREATMENT The present invention provides methods for extracting gold from refractory auriferous material, such as a gold-containing ore, a concentrate thereof, a reclaimed sulphide concentrate or some combination thereof, including the steps of mixing the refractory auriferous material with at least one toxic residue exhibiting a low sulphur content to form a low sulphur content mixture; pressure oxidizing the mixture; and cyaniding the oxidized mixture. Methods for extracting gold while simultaneously decreasing the toxicity of previously generated toxic wastes are also discussed. The gold extraction/toxic waste treatment methods preferably involve mixing refractory auriferous material with first and second toxic residues of low sulphur content; pressure oxidizing the mixture; and cyaniding the oxidized mixture. In these methods, contaminants in the toxic residues (e.g., iron and arsenic) combine with each other or with other feed components to form inert molecules having a decreased environmental impact.</p> |
