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| Number | Title | Issue Date |
| 7909169 | Methods and systems for recovering alluvial gold Various embodiments of methods and systems are provided for mining alluvial gold deposits. The methods can comprise collecting feed from alluvium and washing the feed at high pressure. The feed can be separated into a plurality of separate fractions. At least one fr... | 03/22/2011 |
| 7438188 | Device for use in placer mining operations and method An aggregate material separating device includes a frame with a shaker mechanism. A trough is disposed on the frame and coupled to the shaker mechanism by a shaker spring. A hopper is disposed at an end of the trough and can receive a load of aggregate material. A h... | 10/21/2008 |
| 7422114 | Vibratory material separator having an adjustable air knife and a separation tube A vibratory material separating apparatus has at least two plateau conveying surfaces interrupted by a drop out opening. A composite mixture is conveyed by a vibrating action beyond the first conveying plateau and over a foraminous section in the first conveying pla... | 09/09/2008 |
| 7357259 | Material classifier having a scoop wheel A material classifier for classifying a liquid-solid mixture containing solid material to be separated is provided. The material classifier includes a tank defining a reservoir for receiving the liquid-solid mixture, and a scoop wheel including a plurality of circum... | 04/15/2008 |
| 7314139 | Process for sulphide concentration The present invention relates to a gravity/flotation circuit where a mineral stream, such as a flotation rougher or cleaner concentrate, undergoes a two stage size separation wherein: i) the screen of the first stage provides a coa... | 01/01/2008 |
| 7303060 | Material conveying system without dust rising A material conveying system without dust rising, having a plurality of trays; a transmission mechanism, for carrying the trays and transmitting the trays in motion; and a controller, for controlling the transmission mechanism, is characterized in that the material c... | 12/04/2007 |
| 7255233 | Method and apparatus for separating mixed plastics using flotation techniques A method and apparatus are provided for separating mixed plastics using flotation techniques including a first stage initial washing tank for washing of incoming plastics and providing a first separation process and at least one separation module. The first stage in... | 08/14/2007 |
| 7168568 | Apparatus and method for isolating materials Apparatus is provided for separating non-magnetic mineral values from a source containing magnetic material and non magnetic material. The apparatus includes first and second conveyers in overlying relation which counter-rotate relative to one another. One of the co... | 01/30/2007 |
| 7144360 | Centrifugal separator with a separate strip insert mounted in the bowl A centrifuge concentrator bowl includes a plurality of fluidized recesses at axially spaced positions along the peripheral wall. Each recess is defined by two side walls which has water injection holes for fluidizing materials collecting in the recess. Some of the r... | 12/05/2006 |
| 7134556 | Portable ore washer A circular tray having an upper surface shaped to incline downwardly from a center to an outer circumference. The tray including annular grooves for collecting gold. A crank is connected to the tray for rotating the tray. The tray is supported with a stand having at... | 11/14/2006 |
| 7104403 | Static two stage air classifier A two-stage static air classifier has a feed duct through which particles of a granular mixture fall. A classifying louver plate having fins forming upwardly inclined classifying channels is fitted into a side opening in the feed duct. Particles of a set size are dr... | 09/12/2006 |
| 7093719 | Transportable, self-contained, recirculation, wash plant A combination of prospecting equipment and apparatus, for the purpose of collecting precious minerals from mineral bearing sand and gravel, located in regions that are arid in nature, have little water or limited water usage, due to environmental concerns. The Wash ... | 08/22/2006 |
| 7077271 | Secondary screen for concrete pump An apparatus for the removal of objects and other debris from cement that is pumped via a concrete pump includes a secondary screen that is pivotally attached at one end thereof to a concrete pump a predetermined distance above a grate that is disposed over a hopper... | 07/18/2006 |
| 6997859 | Centrifugal separator with fluid injection openings formed in a separate strip insert A centrifuge concentrator bowl includes a plurality of fluidized recesses at axially spaced positions along the peripheral wall. Each recess is defined by two side walls converging toward a base which has water injection holes for fluidizing materials collecting in ... | 02/14/2006 |
| 6962560 | Continuous centrifugal separation of slurry using balls contained in a recess of a bowl A centrifuge bowl for separating heavier particles from lighter particles and water comprises a first conical bowl wall leading to a pair of annular recesses at actually spaced positions. Each recess is generally V-shaped with an upper side wall, a lower side wall a... | 11/08/2005 |
| 6942103 | Static two stage air classifier A two-stage static air classifier has a feed duct through which particles of a granular mixture fall. A classifying louver plate having fins forming upwardly inclined classifying channels is fitted into a side opening in the feed duct. Particles of a set size are dr... | 09/13/2005 |
| 6938776 | Method and a device for the separation of particles A method of separating a mixture of particles in a liquid that within chosen limits have different physical property values, wherein the particles to be separated are supplied via a feeder to a screen upon which a layer of facilitating particles is disposed the size... | 09/06/2005 |
| 6889842 | Apparatus and method for dry beneficiation of coal A method of beneficiating coal in a dry process includes separating raw coal from a coal mine into coal fines and larger pieces of coal using pressurized air, separating the larger pieces of coal according to size, removing ash from the larger pieces of coal on an a... | 05/10/2005 |
| 6818042 | Method of mineral concentrate redress A slurry of particulate ore material is concentrated to form a smeltable concentrate on a re-concentrator table arranged to separate concentrate ore at a concentrate discharge from middlings and tailings. The table is set such that the concentrate forms a smeltable ... | 11/16/2004 |
| 6799681 | Portable hydraulic classifier A portable hydraulic classifier (10) for mining gold from stream beds wherein the hydraulic classifier (10) includes a lower sluice unit (11) hingedly connected to an upper sluice unit (12) equipped with a water supply unit (14) an... | 10/05/2004 |
| 6786335 | Pyrolysis plant for refuse and method for screening solid residues A pyrolysis plant for refuse and a method for screening solid residues provide a sure and trouble-free sieving of a solid material using a sieving device having a configuration which is as simple as possible. A spiral formed by a rod which is wound in a helicoidal m... | 09/07/2004 |
| 6612443 | Hutch chamber for jig A centrifugal jig has a container mounted for rotation about its longitudinal axis (22), separated into an axial region (32) and a peripheral region by ragging material (41) supported by a screen (30). The peripheral region is composed of a series of hutc... | 09/02/2003 |
| 6561359 | Method and apparatus for removing lightweight particulates during processing of a primary material An apparatus and method for removing lightweight particulates during processing of a primary material. The apparatus includes a classification tank having an inlet, an outlet and a plurality of settling stations located therebetween. A slurry of fluid and... | 05/13/2003 |
| 6305549 | Vibrating screen assembly of dissimilar materials A vibrating screen assembly of dissimilar materials. A frame is composed of a first material having a coefficient of thermal expansion. At least one screen cloth is composed of a second material. A ratio of the coefficient of thermal expansion first mater... | 10/23/2001 |
| 6286686 | Hutch chamber for jig A centrifugal jig has a container mounted for rotation about its longitudinal axis. The container is separated into an axial region and a peripheral region by ragging material supported by a screen. The peripheral region is composed of a series of hutch c... | 09/11/2001 |
| 6193888 | Primary and secondary clarifier's effluent launder dam A method and apparatus is provided for converting a conventional waste water treatment plant for use with BPR and/or BPNR processes downstream of a clarifier. The effluent launder is flooded by means of a dam installed in the effluent launder, and waste w... | 02/27/2001 |
| 6138833 | Placer gold mining method, placer gold mining boat used in this method, placer gold digging and separating method and system therefor, and placer gold separating method and system therefor A placer gold separating method includes subjecting placer gold-and gold ore-containing sand and gravel layers accumulated on the bottom of the water of a river and placer gold- and gold ore-containing sand and gravel layers formed deep in the ground to e... | 10/31/2000 |
| 6131741 | Method and device for the treatment of waste or residual waste To improve a method for the treatment of waste or residual waste (1), the waste or residual waste (1) is sorted into a fraction (16) with specifically light material and a fraction (18) with specifically heavy material first by sieving and then followed b... | 10/17/2000 |
| 6079567 | Separator for separating particles from a slurry A separator (1) for separating dense particulates from slurry includes a sealed housing (2) enclosing a submerged screen bed (33) which allows dense particulates to fall into a hutch (6) from which they may be discharged. The housing has a slurry inlet (4... | 06/27/2000 |
| 6041940 | Metal detection apparatus An apparatus for detecting metal in materials is disclosed. The apparatus has, in combination, a sifter for sifting materials onto a metal detector plate assembly, the metal detector plate assembly having a metal detector plate in electrical communication... | 03/28/2000 |
| 5927509 | Gold separation kit A self-contained gold separation kit adapted for easy carrying using a shoulder strap uses a single-spring rocker assembly for agitation of stream bed materials for separation of gold. The main kit elements include a sluice box, material tower and collect... | 07/27/1999 |
| 5890600 | Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials The invention relates to a method and apparatus for screening pulverized or chip material, such as fibers or wood chips, free from impurities. The material to be screened is fed onto a roll set formed by a number of adjacent, essentially parallel rolls (1... | 04/06/1999 |
| 5785182 | Portable finishing sluice A small sluice for final separation of gold from all other materials commonly found in deposits of gravel, sand, etc. including a bottom panel (14) with a plurality of grooves (16), two substantially vertical sidewalls (15), a flared entrance end (13) and... | 07/28/1998 |
| 5616245 | High gravity separator A separator includes a housing, a basket rotatably mounted in the housing and a movable weir member. The basket has an upstream end portion, a downstream end portion and an intermediate tubular portion that includes or forms a screen deck. The weir member... | 04/01/1997 |
| 5527432 | Method of dry separating fibers from paper making waste sludge and fiber product thereof Provided are methods of dry recovering useable fiber from paper making sludge. In the methods, paper making sludge is dewatered and dried. The dewatered and dried sludge is then fiberized using a dry fiberizing machine into a fibrous material consisting o... | 06/18/1996 |
| 5524767 | Dry fluidized bed sorting device A dry fluidized bed sorting device comprises a sorting deck arranged with an inclination to make a vibrating motion and continuously supplied with a fluidized bed used as media, while being supplied with materials to be sorted, a large number of separatio... | 06/11/1996 |
| 5476177 | Sluice trap A material classification device for separation of solid materials, having a relatively high specific gravity, from a stream of fluid and solid material. The device is particularly suited for the extraction of gold from alluvial material. The device gener... | 12/19/1995 |
| 5462172 | Nonferrous material sorting apparatus A nonferrous material sorting apparatus comprises a screening device for screening nonferrous materials to be sorted into materials of a plurality of size ranges, a first sorting device for sorting the nonferrous materials of the minimum size range accord... | 10/31/1995 |
| 5421461 | Panning apparatus Panning apparatus for separating gold or other minerals or gemstones from soil, gravel or other like materials, the apparatus including a main frame and a secondary frame which supports an upper separating tray assembly and a lower separating pan. The sec... | 06/06/1995 |
| 5375720 | Dry separation of particulate material of different densities An air concentrator for dry separation of gold and other heavy minerals from alluvial deposits comprises a housing having a number of open-topped chambers arranged in a ring-like configuration and surmounted by a screen having rings thereon forming annula... | 12/27/1994 |
