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| Number | Title | Issue Date |
| 6004069 | Method for capping mine waste and tailing deposits A method for providing a composite capping cover for maintaining the surface of a sulphide bearing tailing and mine waste containing deposit moist thereby substantially eliminating oxidation of the sulphidic particulate in the deposit and the formation of... | 12/21/1999 |
| 5795466 | Process for improved separation of sulphide minerals or middlings associated with pyrrhotite A multi-stage froth flotation process is provided for concentrating sulphide minerals or middlings containing non-ferrous metal values such as nickel, cobalt and copper, which co-exist with significant amounts of pyrrhotite. The process is carried out wit... | 08/18/1998 |
| 5693692 | Depressant for flotation separation of polymetallic sulphide ores A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with conventional collector agents and frothing agents in the flotation separation of copper, nickel, lead, zinc sulphides ... | 12/02/1997 |
| 5411148 | Selective flotation process for separation of sulphide minerals This invention provides a process for improved separation of mono/multi-metallic sulphide minerals from significant amounts of iron sulphides, mainly pyrrhotite and/or their finely divided process middlings. The process comprises subjecting such material ... | 05/02/1995 |
| 5382278 | Pretreatment of chromium-bearing metal scrap to remove chromium A process for protreating chromium-beating metal scrap comprises charging the chromium-bearing metal scrap with an iron oxide-bearing slag into a pyrometallurgical furnace, heating and melting the charge, and maintaining the charge molten at a temperature... | 01/17/1995 |
| 5240496 | Pretreatment of chromium-bearing metal scrap to remove chromium A process for pretreating chromium-bearing metal scrap comprises charging the chromium-bearing metal scrap with fayalite slag into a pyrometallurgical furnace, heating and melting the charge, and maintaining the charge molten at a temperature of at least ... | 08/31/1993 |
| 5238579 | Method for generating coarse precipitates from solutions or slurries containing ionic species A method is proposed for performing precipitation reactions which yields precipitate particles in the form of flakes. The precipitate particles are coarse, having cross-measurements in the order of 10 to 400 microns. According to this method, a suitable p... | 08/24/1993 |
| 5149410 | Cathode stripping apparatus A method and apparatus for stripping electrodeposited metal sheets from permanent cathodes comprising a rotating carousel for receiving and sequentially advancing suspended permanent cathodes having electrodeposited metal sheets to a plurality of stations... | 09/22/1992 |
| 5147528 | Phosphate beneficiation process A process for the froth flotation separation of phosphate containing minerals by the use of a new collector agent is described. The new phosphate collector agent is prepared by mixing a fatty acid, tall oil pitch, an amine, and optionally sarcosine with f... | 09/15/1992 |
| 5049612 | Depressant for flotation separation of polymetallic sulphidic ores A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with conventional collector agents and forthing agents in the flotation separation of copper, nickel, lead, zinc sulphides ... | 09/17/1991 |
| 4952329 | Separation of polymetallic sulphides by froth flotation A new depressant composition is provided for the enhanced separation into separate value metal concentrates of copper, nickel, zinc, lead present in polymetallic and massive sulphide ores. The depressant is added in an aqueous solution prepared by dissolving f... | 08/28/1990 |
| 4930595 | Method and apparatus for determining the profile of a subterranean passage A method and apparatus for remotely determining the profile of an inaccessible subterranean passage for example in a mine. An instrument pod is moved through the passage in steps. At each step, a rangefinder scans the wall of the passage and provides to a... | 06/05/1990 |
| 4877517 | Depressant for flotation separation of polymetallic sulphidic ores A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with conventional collector agents and frothing agents in the flotation separation of copper, nickel, lead, zinc sulphides ... | 10/31/1989 |
| 4853113 | Froth Flotation of bastnaesite A process is described for the mineral separation of rare earth metal compounds, such as bastnaesite, contained in oxidic minerals. The process is a froth flotation process utilizing a novel collector emulsion, which is an emulsified mixture of: a seconda... | 08/01/1989 |
| 4814004 | Non-ferrous metal recovery Metal values in non-ferrous metallugical slag are recovered by gently agitating the slag in contact with matte using stirring energy dissipation rates insufficient to emulsify slag in matte. These low agitation rates conserve energy by reducing cooling of... | 03/21/1989 |
| 4786375 | Manufacture of self supporting members of copper containing phosphorus Self supporting members of copper containing phosphorus, for example bulk copper anodes or plates, for use as consumable anodes for copper electrodeposition or for melting for alloy production are manufactured by electrodeposition from an electrolyte cont... | 11/22/1988 |
| 4772382 | Froth flotation of bastnaesite A process is described for the mineral separation of rare earth metal compounds, such as bastnaesite, contained in oxidic minerals. The process is a froth flotation process utilizing a novel collector emulsion, which is an emulsified mixture of: a seconda... | 09/20/1988 |
| 4735710 | Beryllium flotation process A process and reagents are described for separating beryllium silicate concentrates by flotation from oxidic minerals. The process is especially suitable for the separation of phenacite and bertrandite present in ores with complex gangue compositions. The... | 04/05/1988 |
| 4735783 | Process for increasing the selectivity of mineral flotation An aqueous solution containing a water soluble polyvalent metal sulphate, an alkali metal silicate and an alkali metal metabisulphite is described which is added to a slurry of a copper mineral bearing ore to be subjected to a froth flotation step for obt... | 04/05/1988 |
| 4395284 | Abrasion resistant machinable white cast iron A cast iron alloy composition comprising 2.5-3.5% carbon, 0.5-1.0% manganese, 0.25-1.5% silicon, 13-19% chromium, 0.8-3.0% nickel, balance essentially iron which is machinable in the annealed condition and abrasion resistant in the hardened condition. The... | 07/26/1983 |
