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| Number | Title | Issue Date |
| 7384181 | Milled asphalt pavement recycling A milled materials processor consists of a self contained, stationary or fully mobile thermal process plant for the thermal processing of 100% recycled asphalt pavement into new hot mix paving material. Mobile units are designed for transportation by vehicle to a jo... | 06/10/2008 |
| 7335311 | Sludge treatment An apparatus for treating sludge, comprises a press for dewatering the sludge, a compaction device for receiving and compacting sludge dewatered by the press, a shredder for receiving and shredding sludge compacted by the compaction device, and a tube conveyor for c... | 02/26/2008 |
| 7121713 | Swinging agitator for a gypsum calcining apparatus and the like An agitation mechanism for a gypsum processing apparatus which includes a housing having a bottom wall, and at least one side wall. The housing can be constructed and arranged to receive and process gypsum-based products. An agitator frame having a similarly shaped ... | 10/17/2006 |
| 6926522 | Method and apparatus for preheating particulate material An apparatus for preheating particulate material in which the particulate material is transferred from one or more upper storage bins to a circular lower chamber that has an outer, essentially annular, portion which serves as a gas flow passage. The particulate mate... | 08/09/2005 |
| 6910882 | Vertical conveyor apparatus for high temperature continuous processing of materials The invention comprises, in one form thereof, a continuous processing apparatus for high temperature thermal treatment of granular materials. The apparatus includes a vertical conveyor means with an internal feed mechanism for transporting granular feedstock upward,... | 06/28/2005 |
| 6872074 | Method for discharging reduced product from a movable-hearth furnace and a discharging device A method for discharging a reduced product produced on a movable hearth of a movable-hearth furnace uses a discharging device. The discharging device includes a removal unit for removing the reduced product from the movable hearth, a separation unit for separating t... | 03/29/2005 |
| 6802710 | Multiple hearth furnace A multiple hearth furnace includes an upright cylindrical furnace housing divided into a plurality of vertically aligned hearth chambers. A cleaning lance inlet port is sealingly connected to the cylindrical furnace housing and radially leads into one of the hearth ... | 10/12/2004 |
| 6511316 | Method of operating a rotary hearth furnace To provide an operating method of a rotary hearth furnace for producing reduced iron in which a stuck substance stuck on the hearth surface is removed from the hearth surface to thereby prevent or reduce the wear of the knife edge of a screw of a discharg... | 01/28/2003 |
| 6368104 | Rotary hearth furnace An improved rotary hearth furnace having a cylindrical enclosure containing a radially moving belt for transporting pellets containing metal oxide and carbon is disclosed. One or more oxy-fuel burners preferably having a flat flame shape are positioned so... | 04/09/2002 |
| 6210155 | Charging device for a rotary hearth furnace The invention relates to a charging device for creating superimposed layers of fine-grained bulk material on a rotating hearth (2). For each layer of bulk material to be charged, said charging device comprises a discharge hopper (22) having an outflow slo... | 04/03/2001 |
| 6152729 | Spray cooled furnace discharge assembly A discharge assembly for removing material from a hearth in a rotary hearth furnace including a discharge auger and a coolant spray. The discharge auger is positioned above the hearth of the rotary hearth furnace and includes a central shaft having at lea... | 11/28/2000 |
| 5924861 | Furnace discharge assembly A discharge assembly for removing material from a hearth in a rotary hearth furnace. The discharge assembly includes, in combination, a discharge auger and a fluid cooled hood. The discharge auger is positioned above the hearth of the rotary hearth furnac... | 07/20/1999 |
| 5899688 | Rotary hearth furnace A rotary furnace for the treatment of minerals, includes an annular chamber provided with a material feeder apparatus and discharge apparatus for the material, disposed adjacent one another in a certain sector of the chamber. A plurality of burners are ar... | 05/04/1999 |
| 5868566 | Sealed and zone rotary grate convection solids processing apparatus A rotary hearth furnace includes a base having a plurality of first plenums, an upper chamber having a plurality of second plenums and a hearth rotatable between the base and the upper chamber and having a plurality of third plenums. The hearth is moveabl... | 02/09/1999 |
| 5810580 | Mixing rabble for a rotary hearth furnace A rotary hearth furnace has a mixing rabble arrangement that includes a first rabble disposed upstream a flow of material on the hearth and a second rabble disposed downstream a flow of material on the hearth. The first and second rabbles are disposed at ... | 09/22/1998 |
| 5769627 | Vertical type calcination kiln A storage device 23 for storing a raw material to be calcined is provided at a position above a kiln cover 1, and the storage device 23 is connected to a preheating space 22 in such a manner as to be capable of dropwise supplying the raw material into the... | 06/23/1998 |
| 5614016 | Method and plant for manufacturing cement clinker A method and plant for burning sludge or filter cakes during the cement clinker manufacture where the cement is manufactured in known manner by the cement raw meal being preheated, calcined and burned into clinker with subsequent cooling of the clinker an... | 03/25/1997 |
| 5515793 | Incineration furnace An incineration furnace for disposal of waste in which substantially complete burning of waste materials is obtained. A stirring member is rotatably supported in the interior of an incinerator housing, making up the main incineration furnace body. Air for... | 05/14/1996 |
| 5316471 | Method and apparatus for mass transfer in multiple hearth funaces An apparatus for improving mass transfer in a multiple hearth furnace has a plurality of risers adjacent the furnace center shaft which are in fluid communication with a source of treatment fluid. The risers have radially extending branch pipes, each pipe... | 05/31/1994 |
| 5312246 | Heating and conveying apparatus An apparatus for heating and conveying a granular material is disclosed, and which comprises an elongate trough, and a framework mounting a plurality of transverse blades mounted above the trough. The framework is moved along a closed path of travel so th... | 05/17/1994 |
| 5173047 | Shrouded rabbles for use in rotary hearth furnaces A shrouded rabble includes a blade having an active face and a backface with a shroud extending from the backface along a lower edge of the blade. The rabble is suspended above a perforated hearth for urging charge materials on the hearth from one locatio... | 12/22/1992 |
| 5169307 | Process and apparatus for producing small particle lightweight aggregate A process for producing micropellets of lightweight aggregate having a substantially spheroidal configuration which includes continuously mixing ceramic clay and liquid in a high speed rotating pin mixer to encapsulate substantially all other non-volatile... | 12/08/1992 |
| 5144108 | Kiln for producing litharge by means of the calcination of massicot The kiln (1) for producing litharge has a thermally insulated tubular body (2) containing, throughout its length, a shaft (30) with paddles acting as an auger. The tubular body (2) is coaxial with an induction coil (11), which heats it. The raw material i... | 09/01/1992 |
| 5080025 | Cocurrent oxidation method in a multiple hearth furnace A method of oxidizing feed materials using a multiple hearth furnace comprises the steps of introducing the feed materials to be oxidized on at least the uppermost hearth, introducing fuel/air mixtures in the uppermost hearth to dry and ignite the feed ma... | 01/14/1992 |
| 5005494 | Apparatus and method for high temperature disposal of hazardous waste materials An improved method and plasma torch incinerator or reactor in which the incinerator uses a rotating, materials-receiving drum or chamber for receiving the hot plasma of a plasma torch. By properly constructing the inner surface of the rotatable drum and b... | 04/09/1991 |
| 4986750 | Furnace Disclosed is a furnace in which the inside of the furnace is enclosed by a furnace wall having an inner surface lined with a heat insulating material. Heaters for heating an inside of the upper furnace chamber to a predetermined temperature, and an upper ... | 01/22/1991 |
| 4915623 | Calcination apparatus The invention concerns an improved method of calcining gypsum in which non-reactive hot gas is passed into contact with the gypsum from a source through a plurality of tubes extending downwardly into the gypsum. The invention also contemplates an improved... | 04/10/1990 |
| 4906183 | Treatment of expansible materials to form lightweight aggregate Expansion of granular or particulate material is effected by supplying such material, for instance slate chips, at a charging zone CZ of a kiln 10, to the upper surface of a rotating annular hearth 12 so as to lie thereon in a uniform layer up to about th... | 03/06/1990 |
| 4834650 | Sealed rotary hearth furnace with central bearing support The furnace has a hearth which rotates inside a stationary closed chamber and is supported therein on vertical cylindrical conduit which extends through the furnace floor and is supported by a single center bearing. The charge is deposited through the fur... | 05/30/1989 |
| 4834647 | Method and apparatus for conveying carbon black which inhibits the build-up of carbon black fines on conveying surfaces A method and apparatus for conveying carbon black pellets to avoid breaking up the pellets and inhibit caking on the conveying means which may be a screw type conveyor that is sufficiently heated to inhibit caking of the carbon black. The conveying means ... | 05/30/1989 |
| 4818222 | Sealed rotary hearth furnace The furnace has a hearth which rotates inside a stationary closed chamber and is supported therein on circumferentially spaced rollers the shafts of which extend outside the furnace and are cantilevered in bearings. The shafts are sealed to the furnace wa... | 04/04/1989 |
| 4741693 | Method and apparatus for calcining material containing volatile constituents Bulk materials containing volatile constituents are calcined in a two-stage process comprising a first heating stage at de-volatilizing temperature but below calcining temperature during which the material is turned over and mixed to accelerate its bulk h... | 05/03/1988 |
| 4738206 | Apparatus and method for low temperature thermal stripping of volatile organic compounds from soil Apparatus and method for removing volatile and semi-volatile organic contaminants from natural soil containing moisture by sealing the soil in a stripping conveyor against contact with air and vapor stripping the contaminants at a temperature below the bo... | 04/19/1988 |
| 4702694 | Furnace with modular construction A multiple hearth furnace is constructed from a plurality of cylindrical heating chamber modules, connected in a vertical configuration. Each module contains a hollow hearth, which forms a floor in the chamber, the hearth having an open portion approximat... | 10/27/1987 |
| 4669977 | Rotating rabbled roof drying and heating furnace Apparatus for drying and heating wet particulate materials comprises a furnace with stationary circular hearth and sidewalls and a rotating roof. The hearth is perforated to receive hot gases from a plenum chamber below it, which gases are drawn off from ... | 06/02/1987 |
| 4637795 | Method and apparatus for calcining material containing volatile constituents Bulk materials containing volatile constituents are calcined in a two-stage process comprising a first heating stage at de-volatilizing temperature but below calcining temperature during which the material is turned over and mixed to accelerate its bulk h... | 01/20/1987 |
| 4631026 | Rotary turntable furnace for litharge production A turntable furnace for heating particulate material and which is particularly suited for the industrial production of litharge. The particulate material is heated inside the furnace on a turntable hearth and distributed radially outwardly from the center... | 12/23/1986 |
| 4615867 | Apparatus for cooking, dehydration and sterilization-drying of organic wastes Apparatus for cooking-dehydration and sterilization-drying of organic wastes, comprises a chamber (1) heated by a double walled enclosure (2) that communicates with fire tubes (3), the enclosure (2) receiving hot gases from a firebox (4). The hot gases pa... | 10/07/1986 |
| 4606283 | System for extracting contaminants and hydrocarbons from cuttings waste in oil well drilling A system wherein the contaminated cuttings are fed into the system for eventual incineration. The principal apparatus of the system comprises a plurality, preferably three, of horizontally disposed cylindrical drying chambers mounted onto a skid for recei... | 08/19/1986 |
| 4504222 | Screw conveyer and furnace A screw conveyer is provided with a heat insulating casing (16) and with a plurality of pipe burners (30) arranged between a perforated bottom plate (17) of the casing and a housing (13) which contains the screw conveyer and is used for drying waste produ... | 03/12/1985 |
