Method for treating mineral material having organic carbon to facilitate recovery of gold and silver
November 29, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2777764 Process for the recovery of gold from carbonaceous ores Hydrometallurgical process for extracting metal values from complex ores containing arsenic and sulfur Process for the recovery of gold from refractory ores by pressure oxidation Recovery of gold from refractory auriferous iron-containing sulphidic concentrates Recovery of gold from refractory auriferous iron-containing sulphidic ore Gold recovery process Process for the recovery of silver from a residue essentially free of elemental sulphur Recovery of precious metals from refractory low-grade ores Method for the recovery of gold using autoclaving InventorAssigneeApplicationNo. 346404 filed on 11/29/1994US Classes:423/28, Specified particle size423/30, And pressurizing423/41SulfatingExaminersPrimary: Bos, StevenAttorney, Agent or FirmInternational ClassC22B 011/00AbstractProvided is a process for treating refractory precious metal-containing ores, particularly gold-bearing ores, which are refractory due to the presence of organic carbon, to reduce the ability of organic carbon to interfere with recovery of the precious metal. The ore may also contain sulfide materials with which the gold is associated and from which the gold is difficult to separate. The ore is comminuted to a size at which at least about 80 weight percent of the ore is smaller than about 40 microns in size. The comminuted ore is then slurried and subjected to pressure oxidation at severe operating conditions. The treating temperature is greater than about 190° C. When sulfide minerals are present, substantially all of the sulfide sulfur must first be oxidized prior to obtaining significant benefit from the treatment of the organic carbon. Greater than about 96% of the sulfide sulfur must be oxidized.Other References
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