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| Number | Title | Issue Date |
| 6103204 | Selective bioleaching of zinc A method of selectively leaching zinc from a source material containing zinc in sulphide form and iron, comprises the steps of subjecting the source material to bioleaching with a strict sulphur oxidizing micro organism or a mixed culture of sulphur oxidi... | 08/15/2000 |
| 5976219 | Method and apparatus for recycling of scrap metal A process for the recycling of scrap metal, such as copper wire, comprises the steps of combining the scrap metal with a concentrate of a metal similar to the scrap metal in a pressure vessel (10) and subjecting the metal concentrate to pressure oxidation... | 11/02/1999 |
| 5896635 | Apparatus for forming expanded mesh An apparatus for gripping, guiding and transporting opposite longitudinal side edges of slit, deformable strip for forming expanded mesh sheet. One chain of each of two pairs of opposed endless chains has a longitudinal recess adjacent a longitudinal plan... | 04/27/1999 |
| 5833830 | Redox control in the electrodeposition of metals In one embodiment, a method of electrowinning a metal from an electrolyte comprises the steps of measuring the redox potential of the electrolyte to obtain a measured value, comparing the measured value with a predetermined optimum value and adding a redo... | 11/10/1998 |
| 5820335 | Apparatus for collecting plates A method and an apparatus for collecting plates from two rows of plates travelling side-by-side on a moving conveyor comprising inverting plates sequentially in one row of plates and merging said two rows of plates by depositing a plate from one row onto ... | 10/13/1998 |
| 5803949 | Fluidized bed roasting process A method of stabilizing a fluidized bed in a fluidized bed roasting process for metal sulphide concentrate comprises the step of controlling the particle size distribution of the particulate material in the bed so that a minimum amount of no less than abo... | 09/08/1998 |
| 5709731 | Slurry pipeline leaching method A method for concurrently transporting and leaching metal values from an ore or concentrate containing said metal values from an originating site such as an elevated site to a delivery site comprising the steps of crushing and/or grinding the ore or conce... | 01/20/1998 |
| 5601795 | Calomel (Hg2 Cl2) purification process This invention is directed to a novel method for purifying calomel (Hg2 Cl2). More particularly, this invention pertains to a novel process for treating impure calomel (Hg2 Cl2) to produce a highly purified calo... | 02/11/1997 |
| 5584978 | Collection electrode (collectrode) for geo-electrochemical sampling This invention relates to a novel geo-electrochemical sampling electrode and process. More specifically, this invention pertains to a novel ion collection electrode, and process, which can be used in the remote sampling of ions contained in ground water. ... | 12/17/1996 |
| 5558756 | Method for geo-electrochemical sampling This invention relates to a novel geo-electro-chemical sampling electrode and process. More specifically, this invention pertains to a novel ion collection electrode, and process, which can be used in the remote sampling of ions contained in ground water.... | 09/24/1996 |
| 5531903 | Fluoride removal from metal sulphate solution and a method of waste utilization A process is provided for the removal of fluoride from a metal sulphate solution, such as a zinc sulphate solution, which presents an option for the disposal of waste treatment sludge from the aluminum anodizing industry. The fluoride is removed from meta... | 07/02/1996 |
| 5462109 | Method and apparatus for producing metal strip The strip is cast on a chilled casting surface of a rotating drum from a pool of the molten metal contained in a tundish having a graphite lip insert seated therein cooperating with, the casting surface adjacent to the tundish to form and contain the pool... | 10/31/1995 |
| 5449563 | Galvanic protection of rebar by zinc wire Reinforcing steel bar (rebar) in reinforced concrete is inhibited from corrosion by attaching a zinc wire, such as by welding, soldering or co-extrusion, along the length of the rebar. Zinc wire attached to the rebar provides galvanic protection to the st... | 09/12/1995 |
| 5383951 | Production of granular ammonium sulphate using stripped zinc electrolyte as a granulating aid A process is disclosed for the production of free-flowing, non-caking, stable granular ammonium sulphate containing micronutrients comprising granulating ammonium sulphate in the presence of a granulating aid which is stripped zinc electrolyte derived fro... | 01/24/1995 |
| 5266423 | Method for preparing lead-acid battery plates Lead-acid battery plates are made by preparing alloys of lead with at least one additive metal that can be leached with an acid or an alkali from the alloy leaving a porous permeable lead matrix. The additive metal must be evenly and finely dispersed in t... | 11/30/1993 |
| 5225054 | Method for the recovery of cyanide from solutions Cyanide-containing solution is subjected to two-stage membrane electrolysis in units each comprising a cathode, an anode and one or more bipolar electrodes interspaced with cationic membranes defining alternating anode and cathode compartments containing ... | 07/06/1993 |
| 5167274 | Method and apparatus for cooling particulate solids Free-flowing solid particulates are cooled in an apparatus comprising a housing containing a multiplicity of parallel, vertical, expanded heat exchanger plates spaced at 15-100 mm and having passages therebetween. Each plate has continuous flow channels f... | 12/01/1992 |
| 5135652 | Method for the solvent extraction of zinc Zinc is selectively extracted from zinc sulfate solutions that may also contain sulfuric acid and amounts of other metals with an organic extractant mixture containing both organic substituted phosphoric acid and organic substituted thiophosphinic acid. T... | 08/04/1992 |
| 5124120 | Method for making zinc electrodes for alkaline-zinc batteries A method for making zinc electrodes for alkaline-zinc batteries comprising the steps of: mixing an amount of a zinc-magnesium binder alloy with an amount of a material chosen from zinc and a second zinc-magnesium alloy to form a mechanical mixture. The me... | 06/23/1992 |
| 5122375 | Zinc electrode for alkaline batteries A negative zinc electrode for use in an alkaline battery has an active material consisting of zinc-magnesium alloy containing magnesium in an amount in the range of greater than 0% to about 15% by weight. The zinc-magnesium alloy may also contain a small ... | 06/16/1992 |
| 5084180 | Method for treating zinc-containing sulfate solution There is provided a method for treating zinc-containing sulfate solutions which comprises an acid removal for the recovery of a substantially pure sulfuric acid solution and a solution low in acid and containing the zinc and metal impurities from the sulf... | 01/28/1992 |
| 5064538 | Membrane process for acid recovery A method for the recovery of acids from dilute aqueous acid solutions containing at least one metal cation such as Zn, Ca, Mg, Na, K, Mn, Al, Fe, Ni and Co comprises feeding solution to the dialyzate compartments of a dialysis unit. The dialyzate, substan... | 11/12/1991 |
| 5013358 | Method for the recovery of mercury from mercury-containing material Insoluble mercury salts and any mercury in mercury-containing material are converted into a soluble form by controlled chlorination. The soluble forms of mercury in the chlorination solution are reduced with iron, preferably iron powder, to elemental merc... | 05/07/1991 |
| 5002748 | Method for the preparation of copper arsenate Copper arsenate, substantially free from impurities that form sludge in wood preservatives such as chromated copper arsenate, is prepared by adding a solution of soluble arsenate to copper sulfate solution, either or both solutions containing sludge-formi... | 03/26/1991 |
| 4998579 | Electrode casting system A system for casting electrodes includes a row of stationary, adjacent, plate casting molds flanked by a launder containing molten metal and a walking beam conveyor. One or two travelling carriages straddle the molds, launder and conveyor. A travelling ca... | 03/12/1991 |
| 4976832 | Method for making arsenic acid An arsenate solution is treated by electrolysis with membranes for at least partial conversion into arsenic acid and hydroxide. Electrolysis is carried out in an electrolytic unit containing an arrangement of electrodes and membranes. Depending on the ele... | 12/11/1990 |
| 4969502 | Method and apparatus for the casting of metals Molten metals or alloys are poured into a stationary plate mold from at least one elongated pouring device such that melt overflows the length of the mold. The pouring energy is dissipated by flowing the elongated flow from one stationary device against a... | 11/13/1990 |
| 4964471 | Sprinkler system and sprinkler assembly therefor A fire suppression system for use with ducts carrying corrosive gases has a multiplicity of sprinkler assemblies, each having an easily replaceable adapter with a sprinkler head having a fusible alloy fill. The head is screwed into one end of the adapter ... | 10/23/1990 |
| 4961909 | Process for the manufacture of copper arsenate In a process for the manufacture of copper arsenate, an arsenic-containing material is subjected to an oxidative pressure leach with sodium hydroxide forming a leach solution containing sodium arsenate. Sodium arsenate solution is mixed with a solution of... | 10/09/1990 |
| 4959203 | Preparation of copper arsenate Copper arsenate, substantially free from impurities that will form a sludge in the process for producing wood preservatives such as chromated copper aresenate and having a water content of less than 15%, is prepared by mixing a solution of soluble arsenat... | 09/25/1990 |
| 4930757 | Tuyere for metallurgical vessels A tuyere for a metallurgical vessel comprising a solid metal tuyere body with a central gas feed bore. The gas feed bore contains at least one gas feed pipe. The tuyere body also has at least one water-cooled bore between the outer wall of the tuyere body... | 06/05/1990 |
| 4915919 | Recovery of germanium from aqueous solutions by solvent extraction An improved method for selectively rcovering Ge from acidic solution containing Ge and typically Zn, As, Cd, Sb, In, Cu and Fe (II) by multistage, countercurrent liquid-liquid extraction is described. The extractant used in the organic phase is an oxime, ... | 04/10/1990 |
| 4915802 | Method for making low alpha count lead Lead with a low alpha particle emission is produced by selecting an orebody wherein lead mineral is present in a coarsely disseminated form and substantially free of impurities. The ore is selected from a host rock that is relatively low in alpha emitters... | 04/10/1990 |
| 4911826 | Sparging system for column flotation A system for sparging aerated water into a column for the froth flotation of minerals, and located in the lower portion of the column, consists of water and air supply headers connected to a supply of pressurized water and air, respectively. The headers c... | 03/27/1990 |
| 4911755 | Method for the refining of lead Lead that forms dross upon melting is refined by treatment with refining agents consisting essentially of calcium metal and aluminum-silicon eutectic alloy. The refining agents are mixed into a bath of molten lead preferably at 600° C., the bath is coole... | 03/27/1990 |
| 4888051 | Method for the zone refining of gallium Gallium is zone refined in a stationary, vertical, double annulus refiner. Impure gallium is contained between walls of a first annulus that are made of a material that does not impart impurities to the gallium. At least one of the walls is made of a flex... | 12/19/1989 |
| 4838935 | Method for making tungsten-titanium sputtering targets and product Tungsten-titanium sputtering targets with improved characteristics are made from high-purity tungsten powder and a second powder consisting of high-purity titanium hydride powder or high-purity titanium hydride powder and high-purity titanium powder. The ... | 06/13/1989 |
| 4820340 | Method for slag fuming and reduction The slag fuming process for the recovery of metal values from a slag from the smelting of non-ferrous metal concentrates is carried out more efficiently with lower quantities of fuel-reductant by injecting a portion of the fuel/reductant through one or mo... | 04/11/1989 |
| 4770698 | Method for making low alpha count lead Lead with a low alpha particle emission is produced by selecting an orebody wherein lead mineral is present in a coarsely disseminated form and substantially free of impurities. The ore is selected from a host rock that is relatively low in alpha emitters... | 09/13/1988 |
| 4743428 | Method for agitating metals and producing alloys Method and apparatus for the agitation of base metal on alloy melts, and for the agitation and alloying of base metal melts with at least one alloying metal. A rotatable device is suspended in a melt of base metal and the device is rotated to draw at leas... | 05/10/1988 |
