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| Number | Title | Issue Date |
| 5824133 | Microwave treatment of metal bearing ores and concentrates The present invention provides a new and useful method for bringing about a metallurgical effect in a metal-containing ore or concentrate comprising treating said ore in a resonant microwave cavity while maximizing electric field strength in the area of s... | 10/20/1998 |
| 5769925 | Process for the elution of precious metals absorbed on active carbon A powerful reducing agent such as hydrazine monohydrate is added to the standard eluent solutions such as NsOH-NaCN with or without alcohol. The kinetics of elution of gold or of silver are thus markedly enhanced.... | 06/23/1998 |
| 5536294 | Process for extracting precious metals from volcanic ore A process for extracting precious metal from volcanic ore includes the steps of crushing the ore, heating the ore in a hydrogen atmosphere to soften oxide mineral encapsulating the precious metal, cooling the ore, grinding the ore, and processing the ore ... | 07/16/1996 |
| 5443619 | Process for extracting metals from solution A process for extracting iron, copper, and nickel from a solution containing iron, copper, nickel, and at least one contaminent selected from the group comprising magnesium, aluminum, calcium and sodium, wherein each of said solutes is present at its resp... | 08/22/1995 |
| 5439503 | Process for treatment of volcanic igneous rocks to recover gold, silver and platinum The recovery of gold, silver and platinum group metals from volcanic cinders containing iron is achieved by mixing the cinders with a suitable flux, and metallic copper, and smelting the mixture at a sufficiently high temperature to produce a molten mass ... | 08/08/1995 |
| 5425799 | Process for roasting refractory gold ores Refractory gold ores are roasted at temperatures from 500° to 650° C. in an oxidizing atmosphere in a fluidized bed, which is supplied with a carbonaceous additional fuel. To effect a substantially complete combustion of the additional fuel to form CO | 06/20/1995 |
| 5238485 | Method for the assay and recovery of precious metals Complex ores of the precious metals which also contain iron spinels and similar compounds are assayed and their precious metals content is extracted by subjecting the ores or concentrates thereof together with an iron-embrittling agent to a pyrometallurgi... | 08/24/1993 |
| 5123956 | Process for treating ore having recoverable gold values and including arsenic-, carbon- and sulfur-containing components by roasting in an oxygen-enriched gaseous atmosphere Recovery of a precious metal value from refractory carbonaceous and sulfidic ores, concentrates or tailings which also include arsenic-containing components is improved by roasting the ore or ore concentrate in an oxygen-enriched gaseous atmosphere having... | 06/23/1992 |
| 5074909 | Gold and silver recovery method A process for recovering gold and silver from refractory ores containing precious metals locked in sulfide and arsenide minerals including roasting a concentrate of said sulfide and arsenide minerals with lime at a temperature of about 600° C. Thereafter... | 12/24/1991 |
| 5004500 | Chlorination process for recovering gold values from gold alloys A process for the recovery of precious metal values as essentially pure gold from gold alloys in the form of thin strips 0.05 to 0.25 inch thick having a gold content of up to 80% gold comprising chlorinating the strips at a temperature of 300 to 700 degr... | 04/02/1991 |
| 4919715 | Treating refractory gold ores via oxygen-enriched roasting Gold-containing ores, having refractory sulfidic matter or a combination of refractory sulfidic matter and refractory carbonaceous matter, are processed to recover their gold values. The process uses an ore roasting procedure that utilizes a two-state, fl... | 04/24/1990 |
| 4390366 | Process for the extraction of precious metals from solutions thereof A process for sequentially and selectively separating gold and platinum group metals from aqueous solutions containing them is disclosed. First, ruthenium and osmium are oxidized to their tetroxides and then removed from the solution. Then, gold is removed by ... | 06/28/1983 |
| 4368073 | Use of the sodium salt of 2-mercaptopyridine-N-oxide to separate gold from acidic solutions Disclosed is a process for separating gold from acidic solutions having a pH below about 3 which comprises the steps of: (a) adding a sufficient amount of the sodium salt of 2-mercaptopyridine-N-oxide to cause at least a portion of the gold in the aqueous... | 01/11/1983 |
| 4353740 | Chlorine extraction of gold A process for treating a particulated gold bearing ore to recover the gold therein is disclosed. The process includes roasting the ore to remove sulfides as sulfur dioxide followed by chlorination of the ore at a temperature of about 350° C. in the prese... | 10/12/1982 |
| 4337226 | Recovery of platinum-group metals from ores Metal values are recovered from ore concentrates by means of dry grinding, followed by a two-stage leaching process in which the ground concentrate is first leached with sulfuric acid at a temperature of about 90° to 100° C. to selectively leach nickel ... | 06/29/1982 |
| 4086084 | Refining of metals This invention relates to refining platinum group metal concentrates and the separation therefrom of silver and of the majority of base metals with which they naturally occur. In more detail the process comprises the steps of: (a) contacting a solid parti... | 04/25/1978 |
