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| Number | Title | Issue Date |
| 7498006 | Process for extracting gold in arsenic-containing concentrate of gold A method of extracting gold from arsenic gold ore concentrate, wherein increase the temperature of smelting chamber to 100-300° C. and then hold the temperature to remove the vapor and small quantity of dust in the arsenic gold ore concentrate; Under residual press... | 03/03/2009 |
| 7264781 | Calcining plant and method Particulate material to be calcined is conditioned and then introduced into a stream of flue gases which transport the material along a sloping drying duct while drying the material. The dried material is then introduced into the same stream of flue gases upstream o... | 09/04/2007 |
| 7066983 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polyth... | 06/27/2006 |
| 7022504 | Method for the bacterially assisted heap leaching of chalcopyrite A method for the bacterially assisted heap leaching of chalcopyrite includes providing a chalcopyrite containing ore heap to oxidize sulphide minerals therein, the heap containing and/or being inoculated with a sulphide oxidizing bacterial culture that either does n... | 04/04/2006 |
| 6932857 | Multi-stage collector and method of operation A multi-stage collector of the type used to collect particles from industrial gas. The collector can contain multiple narrow and wide zones formed by a plurality of parallel corrugated plates. Contained in the narrow zones can be elongated electrodes with sharp lead... | 08/23/2005 |
| 6933861 | Key-operating device for a hand-held video game apparatus A key-operating device includes a shell confining a chamber therein and connected to a video game apparatus with depressible keys, a lever pivotally mounted in the chamber and having protrusions projecting toward the keys, a wheel surrounding and connected to the sh... | 08/23/2005 |
| 6755891 | Process for the treatment or removal of impurities in a hydrometallurgical extraction process A Process for the treatment or removal of impurities, such as arsenic, antimony or bismuth, generated as by-products during smelting and refining of copper concentrates, comprises subjecting the by-products to pressure oxidation along with a copper concentrate in a ... | 06/29/2004 |
| 6482373 | Process for treating ore having recoverable metal values including arsenic containing components Roasting of ores with metal values such as precious metal ores for recovery of metal values with conversion of arsenic to an insoluble form in-situ in presence of an additive such as iron and in presence of oxygen injected initially or supplementally in a... | 11/19/2002 |
| 6475462 | Process and apparatus for treating particulate matter The present invention provides a process for treating a particulate material, in which particles of the material to be treated interact with non-static particles of a second material, the process comprising the steps of: (i) providing a processing chamber... | 11/05/2002 |
| 6451275 | Methods for reducing cyanide consumption in precious metal recovery by reducing the content of intermediate sulfur oxidation products therein Briefly stated, there is provided a method for reducing cyanide consumption in precious metals mining extraction processes involving a sulfur bearing ore body, comprising the steps of providing a precious metal bearing material having intermediate sulfur ... | 09/17/2002 |
| 6409978 | Method of removing impurities from mineral concentrates A process for removing impurities contained in the crystal lattice of minerals, comprising the steps of forming a mixture of a mineral capable of structurally reorganizing its crystal lattice which contains an impurity in its crystal lattice and a halogen... | 06/25/2002 |
| 6403043 | Use of gaseous mixture containing an inert gas and an oxygen containing gas in desulphurization of blister copper during anode refining The invention is concerned with an improved process for the desulphurization of blister copper during anode refining, wherein a mixture of an inert gas and an oxygen containing gas is blown into liquid blister copper. The improvement resides in varying th... | 06/11/2002 |
| 6342190 | Process for increasing recovery of precious metals in an ore processing operation An ore separation process is provided which begins with a specially designed primary grinding mill. The primary grinding mill grinds the ore into a fine powder which is then blown into the primary sizing baghouse which separates the smaller particles from... | 01/29/2002 |
| 6270555 | Process for treating precious metal ores This invention provides a method to control the off gas emission of sulfur dioxide from a mineral ore roaster by grinding a sulfur-containing mineral ore, adding sodium sesquicarbonate to the mineral ore, and roasting the ore and sodium sesquicarbonate at... | 08/07/2001 |
| 6248301 | Process for treating ore having recoverable metal values including arsenic containing components Refractory gold ores are roasted in the presence of added fuels in an oxidizing atmosphere in a fluidized bed at a temperature from 450 to 650° C., which is supplied with oxygen-containing gases; to achieve a low ignition and thus low roasting temperatur... | 06/19/2001 |
| 6143259 | Treatment of pyrite and arsenophrite containing material with ferric ions and sulfur dioxide/oxygen mixture to improve extraction of valuable metals therefrom A method of treating a mined material which includes a sulphide mineral and iron or a concentrate of the mined material to improve the recovery of a valuable metal from the sulphide mineral is disclosed. The method comprises: (i) oxidising the sulphide mi... | 11/07/2000 |
| 6090353 | Method of removing impurities from mineral concentrates A process for removing impurities contained in the crystal lattice of minerals, comprising the steps of forming a mixture of a mineral capable of structurally reorganizing its crystal lattice which contains an impurity in its crystal lattice and a halogen... | 07/18/2000 |
| 5804150 | Process for treating gold-containing sulfide ores The ore which contains gold and at least one of the metals silver, copper, nickel, zinc or iron is calcined at temperatures in the range from 500° to 900° C. with the addition of oxygen-containing gas, thereby producing a metal-oxide-containing solids m... | 09/08/1998 |
| 5783158 | Process for treating sulfide ores containing gold and/or silver and as accompanying metal at least iron The ore which contains gold and/or silver and as accompanying metal at least iron is calcined at temperatures in the range from 500° to 900° C. with the addition of oxygen-containing gas. There is obtained a metal-oxide-containing solids mixture and a S... | 07/21/1998 |
| 5762891 | Process for stabilization of arsenic The present invention is a method to remove arsenic from arsenic-containing materials, such as an ore or concentrate, by roasting the arsenic-containing material to convert arsenic sulfides into arsenic oxides. The arsenic oxides are contained in the roas... | 06/09/1998 |
| 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 |
| 5380504 | Treatment of gold bearing ore The present invention relates to a process for roasting gold containing ore in which a flash furnace means is provided, in particular a gas suspension furnace for roasting the ore. Hot gas and the gold containing ore to be roasted are supplied to the furn... | 01/10/1995 |
| 5262063 | Multiple-stage precipitation process for heavy metals in aqueous solution In the process of removing heavy metals from aqueous solutions by precipitation of a salt thereof at increased pH, multiple stage precipitation by upward stepwise pH adjustment and solid separation at each stage is used to facilitate the manufacture of a ... | 11/16/1993 |
| 5254320 | Method for roasting sulphide ores A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. The ore and a sulphur-binding lime-containing material are supplied to a roasting furnace in which the ore is roast... | 10/19/1993 |
| 5234669 | Recovery of non-ferrous metals from smelter flue dusts and sludges Methods are disclosed for treating smelter flue dust and other smelter by-products so as to recover non-ferrous metals therefrom and convert arsenic and sulfur in the flue dust into non-leachable compounds. The methods allow the flue dust and other smelte... | 08/10/1993 |
| 5188713 | Process for recovery of metal A process for recovery of metal from a feedstock comprising copper is provided. The process comprises the steps of: (a) contacting the feedstock with an aqueous mixture comprising ammonium nitrate having a concentration greater than about 1.5M and sulphuric ac... | 02/23/1993 |
| 5132102 | Method for heat treatment of fines with atmosphere control A method to operate a flash calcination unit with both atmosphere and temperature control is described for mineral processing requirements and other atmosphere controlled processes. The method can be used to process phosphate, gold ore or activated carbon... | 07/21/1992 |
| 5126116 | Method for forming copper arsenate The invention provides a method of forming copper arsenate. Copper and arsenic are leached into a treatment solution maintained at a pH level of about 2 to 5 in the presence of at least one impurity. An oxidant is added to the treatment solution to oxidiz... | 06/30/1992 |
| 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 |
| 5104445 | Process for recovering metals from refractory ores The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C. Thereafter, an oxidation step can be used to convert ir... | 04/14/1992 |
| 5032175 | Process for removing impurities from flue dusts The invention is a process for the removal of high concentrations of impurities including antimony (Sb), bismuth (Bi), arsenic (As), lead (Pb), zinc (Zn), cadmium (Cd), selenium (Se) and tellurium (Te) contained in flue dusts produced during the smelting ... | 07/16/1991 |
| 4731114 | Recovery of precious metals from refractory low-grade ores Low-grade refractory gold ores, which may also contain silver and other metal values are treated by partial roasting of concentrate to remove controlled amounts of sulfur and carbon, then oxygen pressure leached to oxidize further amounts of sulfur and ca... | 03/15/1988 |
| 4729888 | Process of recovery of sulphur from minerals containing pyrites Production of elementary sulphur from an iron sulphide mineral, which comprises oxidizing acid lixiviation of the pulverized mineral, for extraction of the sulfur. The pulp obtained from the lixiviation is treated in the hot with an organic solvent for su... | 03/08/1988 |
| 4726937 | Recovery of nickel chloride and sulfur from waste products Waste containing sulfur and nickel sulfide is heated to volatilize sulfur and reacted with hydrogen chloride to form nickel chloride.... | 02/23/1988 |
| 4629502 | Pressurized reaction of refractory ores with heat recovery Metal is removed from particlized metal bearing refractory ores in an efficient manner utilizing pressure metallurgy with heat recovery. The particlized ore is mixed with a heated liquid, and preferably a flocculant and fibers, to form a slurry. The ore i... | 12/16/1986 |
| 4561884 | Apparatus for removal of impurity components from sulphidic and metallized molten copper mattes A process for the removal of impurities from sulphidic and metallized molten copper mattes, in which in preliminary smelting of the crude metal molten sulphide and molten arsenide-antimonide phases are produced, whereby (a) the molten arsenide-antimonide ... | 12/31/1985 |
| 4497778 | Microbial leaching of sulphide-containing ores A process of extracting metals from a material containing at least 10% by weight of pyrite and selected from the group consisting of ores containing sulphide, concentrates of such ores and mixtures of such ores and/or concentrates by microbial leaching wh... | 02/05/1985 |
| 4394164 | Process for removal of harmful impurities from metallurgical sulphide melts A process for the removal of harmful impurities, particularly arsenic, antimony, bismuth and lead, from metallurgical sulphide melts, in which the sulphide melt is sulphurated before conversion, during the slag-blowing stage or after it before the blister... | 07/19/1983 |
| 4386061 | Method of treating pyrite bearing polymetallic material A method of treating pyrite bearing polymetallic material comprises heating the material in an atmosphere of reducing gases at a temperature of 450° to 500° C. for a period of 30 to 60 min. Gases such as hydrogen, or products of conversion of natural gas or ... | 05/31/1983 |
| 4376647 | Process for treating sulfide-bearing ores A process for removing sulfur from sulfide-bearing ores by reacting water vapor with the sulfide-bearing ore forming hydrogen sulfide while simultaneously regenerating water vapor by reacting the hydrogen sulfide with lime. Advantageously, the process occ... | 03/15/1983 |
