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| Number | Title | Issue Date |
| 7066981 | Assaying method The invention provides a method of assaying a mineral sample for determining the concentration of selected metals in a sample comprising the steps of providing a comminuted mineral sample; mixing such sample with a flux; preheating a reaction vessel to a temperature... | 06/27/2006 |
| 6916357 | Method for introducing a granular ore into a roasting kiln Granular ore or ore concentrate is charged into a furnace for calcining the ore at temperatures of 400 to 1050° C., the ore forming a stationary fluidized bed in the furnace. The ore is thrown onto the fluidized bed through an opening in the furnace housing dispose... | 07/12/2005 |
| 6830823 | Gold powders, methods for producing powders and devices fabricated from same Gold powders and methods for producing gold powders. The powders preferably have a small particle size, narrow size distribution and a spherical morphology. The method includes forming the particles by a spray pyrolysis technique. The invention also includes novel d... | 12/14/2004 |
| 6555010 | Solution mining process for removing metals from aqueous solution A process is disclosed for obtaining colloid-forming metal particles from an aqueous mine waste solution containing that metal in ionic form. In accordance with this process, an aqueous mine waste solution containing that metal in ionic form is provided h... | 04/29/2003 |
| 5616165 | Method for making gold powders by aerosol decomposition The invention is directed to a method for the manufacture of substantially fully densified, finely divided particles of gold wherein the operating temperature is below the melting point of gold.... | 04/01/1997 |
| 5403380 | Method for producing easily volatile metals, such as zinc, lead, mercury and cadmium, of sulfidic raw materials The invention relates to a method for producing zinc, cadmium, lead and other easily volatile metals from sulfidic raw materials in a pyrometallurgical process. In the method, zinc sulfide concentrate is fed into molten copper in atmospheric conditions, a... | 04/04/1995 |
| 5279644 | Fire refining precious metals asay method A new environmentally safe fire refining precious metal assay method is provided wherein bismuth oxide is used with a special flux composition as the precious metal collector and the cupelling procedure is performed in a controlled temperature range.... | 01/18/1994 |
| 5238662 | Processes for recovering precious metals Disclosed is a process for recovering precious metals using a combination of smelting and an effective utilization of molten salt chlorination. More specifically, disclosed is a process including the steps of (i) contacting, for example, a matte with a ch... | 08/24/1993 |
| 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 |
| 5085836 | Process for desilvering silver halide processing fluids A method to reduce dissolved silver present in spent, waste, photographic processing fluids containing thiosulfate, is described. This process involves adjusting the pH to a low level prior to the addition of finely ground steel to the solution. With the ... | 02/04/1992 |
| 5074910 | Process for recovering precious metals from sulfide ores The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at ... | 12/24/1991 |
| 4955482 | Screen cleaning in cil & cip systems In carbon-in-pulp (CIP) and carbon-in-leach (CIL) processes, especially those utilizing pure oxygen instead of normal air to increase the overall efficiency of the cyanide leaching-adsorption process in the recovery of gold and/or silver from ores, the sc... | 09/11/1990 |
| 4695317 | Method of treating silicate ore containing gold and silver A silicate ore containing gold and silver is melted with the slag from a copper converter and a reducing agent. A source of CaO may also be added to the slag so that the treated slag may contain at least 3.0% by weight of CaO. Copper is recovered from the... | 09/22/1987 |
| 4657586 | Submerged combustion in molten materials A process for heating a molten material by injecting oxygen and a fuel into a molten bath of the material at a bath temperature above the spontaneous combustion temperature of the fuel, at least a portion of the fuel forming a shroud around the oxygen, an... | 04/14/1987 |
| 4613365 | Method for recovering precious metals The invention relates to a method for pyrometallurgically recovering the precious metal content, such as gold, silver and platinum metals, of halogen-bearing materials rich in silver. The material is caused to rapidly disperse in or be finely distributed ... | 09/23/1986 |
| 4608083 | Method for recovering the valuable metal content of contaminated copper raw material The invention relates to a method for recovering the valuable metal content of a mix of contaminated copper raw materials, of which materials at least one is sulphide bearing, and which contain one or more impurities forming the group arsenic, antimony, b... | 08/26/1986 |
| 4581064 | Treatment of anode slimes in a top blown rotary converter A process for treating anode slimes originating from copper, lead or nickel electrorefining to recover the precious metals contained therein is disclosed. The process comprises the steps of charging the slimes into a tiltable and rotatable top blown rotar... | 04/08/1986 |
| 4514221 | Method of smelting zinc by injection smelting A method of recovering metallic zinc is disclosed, wherein zinc calcine is introduced to a smelter together with oxygen-enriched air and pulverized coke or coal as reducing agents. The smelter contains two layers, i.e. an upper layer of slag containing th... | 04/30/1985 |
| 4451290 | Recovery of platinum group metals from scrap and residues A process for the recovery of platinum group metals, Ag and Au from a precious metal containing residue which includes the platinum group metals, Ag and Au together with Fe, Cu, Ni, Se and Te, the process comprising the following steps: (a) smelting the p... | 05/29/1984 |
| 4448604 | Recovery of precious metals from leach residues This invention relates to the recovery of platinum group metals and Au and Ag from high sulphur content base metal sulphide ore residues and also to the separation of Ag from the other precious metals referred to. The process for the recovery of platinum group... | 05/15/1984 |
| 4447262 | Destruction of halogen-containing materials An organic waste containing halogen is destroyed by treatment in a molten salt pool comprising a mixture of a basic alkaline earth metal compound with an alkaline earth metal halide. An oxygen-containing gas is introduced into the pool containing the wast... | 05/08/1984 |
| 4416692 | Process for extracting gold, silver, platinum, lead, or manganese metals from ore A process for extracting metals having lead affinity from mineral ores. The process is in steps including, pulverizing the ore material, drying the ore, melting elemental lead in a melting chamber and maintaining the molten lead within a preselected tempe... | 11/22/1983 |
| 4404027 | Method of recovering heavy metals In a method of recovering heavy metals from filter residues containing metal oxides, metal hydroxides or metal carbonates, the residues are dried and reduced during heat supply in the presence of carbon-containing reducing agents. The metal-containing fil... | 09/13/1983 |
| 4397686 | Method for refining precious metals A method for economically removing base metal impurities, other oxidizable impurities, and volatile impurities from precious-metal-bearing metallic materials, consisting of silver and gold, to obtain, with high recovery, a resultant precious metal of high... | 08/09/1983 |
| 4164418 | Method of recovering valuable metals from zinc bearing materials and blast furnace relevant thereto The blast furnace in the present invention comprises a V-shaped or an inclined hearth, tuyeres disposed along said hearth, a tap hole for discharging matte and/or slag, said tap hole being disposed at the lowest part of the hearth, and dampers having V-sh... | 08/14/1979 |
| 4135923 | Extraction of metals This invention relates to the extraction of metals. More particularly, the invention is concerned with the extraction of one or more precious metals from material containing such metals. By "precious metals", both here and throughout the remainder of this... | 01/23/1979 |
| 3979205 | Metal recovery method The present invention is a method of treating sea or land carbonaceous ore or reconstituted, formerly carbonaceous ore to recover therefrom noble metal values. If sea ore is used, noble metal containing composite organic material is first separated from a... | 09/07/1976 |
