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| Number | Title | Issue Date |
| 8163230 | Rotary hearth furnace for treating metal oxide materials A rotary hearth furnace for treating metal oxide materials comprises a hearth mounted for rotary movement within an enclosure. One or more fuel burners are positioned above the hearth. The burners are operably fired to heat the furnace so that heat radiates toward t... | 04/24/2012 |
| 7204689 | Seal structure of solid feeding screw, and method of manufacturing reduced metal using the seal structure A sealing structure for a solid-transferring screw installed inside a heating furnace such as a material-leveling screw and a product-discharging screw, the sealing structure enabling the solid-transferring screw to be lifted during operation while airtightness of t... | 04/17/2007 |
| 7160501 | Method for the salt-free, non-oxidizing remelting of aluminium Process and device for saltless, oxidation-free remelting of aluminum, its alloys and of aluminum scrap with miscellaneous impurities, such as combustible oily substances, adherent combustible or noncombustible materials and those with a higher specific weight in a ... | 01/09/2007 |
| 6685466 | Rotary hearth furnace for producing reduced metal and method of producing reduced metal In a rotary hearth furnace for producing reduced metal through heating and reducing carbon containing materials composed of at least metal oxide-containing material and carbon-containing reduction material, a hearth structure is provided by which a refrac... | 02/03/2004 |
| 6652802 | Direct iron and steelmaking Solid state iron oxide reduction in a gas-solid reduction zone is combined with continuous melting of the hot solid reduced iron in a fuel-fired gas-solid-liquid melting zone within a rotary furnace. The process includes direct pneumatic transfer of the h... | 11/25/2003 |
| 6379610 | Apparatus and process for treating a particulate material within a rotating retort Apparatus (1) and process for treating particulate material or powder (33) of a size capable of being fluidized in a retort (31) mounted for rotation on a pair of end axles (18, 41). Retort (31) is mounted on a tilt frame (5) for tilting movement in a ver... | 04/30/2002 |
| 6251337 | Apparatus and method for treating a particulate material within a rotating retort An apparatus and process for treating particulate material within a rotating retort in which gas is injected within the retort to fluidize the particulate material within the rotating retort. An auger is mounted within an axle supporting the retort for ro... | 06/26/2001 |
| 6241804 | Process for producing iron briquettes and/or cold iron sponge A process and apparatus for producing iron briquettes and/or cold iron sponge, in which charge materials (3) which contain lumpy material containing iron oxide are introduced into the reduction zone (2) of a reduction reactor (1), then a hot reduction gas... | 06/05/2001 |
| 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 |
| 5989486 | Apparatus for removal of the mercury from granulated materials An apparatus for retorting granulated material containing mercury such as ores and precipitates wherein the granulated material is stirred by means of a plurality of paddles while under vacuum and at high temperature within a drum of the apparatus. The va... | 11/23/1999 |
| 5900040 | Roasting of titaniferous materials A method and apparatus of introducing one or more reagents into a rotary and/or elongate kiln in which titaniferous material is being treated eg upgraded wherein the reagent(s) is introduced (I) at a plurality of locations along the length of the kiln and... | 05/04/1999 |
| 5853657 | Reduced dusting bath system for metallurgical treatment of sulfide materials A pyrometallurgical vessel suitable for continuous or semicontinuous smelting and/or conversion of molten base metal sulfide feed materials. The top blown, bottom stirred vessel includes oxidizing gas lances and feed pipes directing their respective conte... | 12/29/1998 |
| 5843204 | Method for recycling iron and steel industry waste In a method of recycling iron and steel industry waste by processing the waste as an object substance by the use of a rotary kiln, the object substance is changed into a valuable material while the object substance travels within the rotary kiln from an u... | 12/01/1998 |
| 5783142 | Kiln system for treatment of reactive fines A kiln system for a process for treatment of aluminum dross residue (NMP) having available aluminum nitride (AlN) and/or free aluminum (Al) and/or aluminum chlorides (AlCl3) having a particle size within the range of 0.3 to 300 microns, i.e., "... | 07/21/1998 |
| 5766544 | Process for fluidizing particulate material within a rotatable retort A method for fluidizing particulate material within a retort (22) mounted on a horizontal shaft or axle (36) for rotation. Gas enters retort (22) through a pipe (52) extending along the longitudinal axis of the shaft (36) and is exhausted through pipe man... | 06/16/1998 |
| 5759483 | Apparatus for treating a particulate material within a rotating retort Apparatus (1) for treating particulate material or powder (33) of a size capable of being fluidized in a retort (31) mounted for rotation on a pair of end axles (18, 41). Retort (31) is mounted on a tilt frame (5) for tilting movement in a vertical plane.... | 06/02/1998 |
| 5685524 | Direct ironmaking or steelmaking apparatus using self-reducing iron oxide pellets Apparatus for preheating self-reducing pellets for direct use in ironmaking or steelmaking in which a preheat chamber contains the pellets and is primarily externally heated using waste exhaust gases and secondarily heated directly by using an internal pr... | 11/11/1997 |
| 5616296 | Waste management facility An industrial waste management facility (IWMF) for disposing of spent potlining includes a co-current gas-fired rotary kiln for containing a molten pool of spent potlining throughout the entire length of the rotary kiln from the inlet to the outlet, an as... | 04/01/1997 |
| 5567380 | Rotary retort heat treating furnace seals The present invention provides a seal ring assembly for sealing a discharge end of a rotary retort heat treating furnace. The furnace contemplated by this invention has an outer furnace shell, a retort chamber, a rear plug, a cone casting, and a support r... | 10/22/1996 |
| 5472478 | Reduction of metal oxides and vessel A method of reducing metal oxides in a vessel containing a molten bath, the bath comprising a metal layer and a slag layer, wherein metal oxides and carbonaceous material are introduced into the bath, gas is injected into the slag layer to case the erupti... | 12/05/1995 |
| 5437707 | Apparatus for treating iron ore Apparatus for treating iron ore, comprising an elongate and generally cylindrical inclined kiln mounted for rotation about its longitudinal axis. A drive motor is coupled to the kiln to rotate the latter about that axis. A moving grate is positioned at th... | 08/01/1995 |
| 5403379 | Reduction of titaniferous ores and apparatus A process for treating titaniferous material by treating the titaniferous material and a particulant carbonaceous material in a kiln, recovering reduced titaniferous material and particulant char from the kiln and separating the particulant char, recyclin... | 04/04/1995 |
| 5382002 | Apparatus for heat treating a particulate material An apparatus for heat treating particulate material containing a combustible contaminant. The particulate material is fed into the upstream end of a rotary drum and is conveyed toward the downstream end of the drum. A fixed first tubular member is dispose... | 01/17/1995 |
| 5320799 | Apparatus for continuous copper smelting There is disclosed an apparatus for smelting copper which includes a smelting furnace, a separating furnace, a converting furnace, and launders connecting these furnaces in series. In the smelting furnace, copper concentrate is melted and oxidized to prod... | 06/14/1994 |
| 5316719 | Apparatus for producing a substance utilizing agravic effect A method of producing a substance utilizing an agravic effect, and an apparatus for carrying out the same. A container (3, 55, 65) containing materials for producing a substance is revolved about a horizontal axis, at least while a process of producing th... | 05/31/1994 |
| 5314171 | Apparatus for the extraction of metals from metal-containing raw materials Metal-containing ores are extracted by a process and apparatus which avoid contaminating the product with fuel gas components. In a rotary kiln, a heat shock-resistant ceramic pipe is subjected to indirect high temperature heating, thereby allowing the ex... | 05/24/1994 |
| 5261943 | Method and apparatus for the extraction of metals from metal-containing raw materials Metal-containing ores are extracted by a process and apparatus which avoid contaminating the product with fuel gas components. In a rotary kiln, a heat shock-resistant ceramic pipe is subjected to indirect high temperature heating, thereby allowing the ex... | 11/16/1993 |
| 5219522 | Method of producing a substance utilizing agravic effect and an apparatus for carrying out same A method of producing a substance utilizing an agravic effect, and an apparatus for carrying out the same. A container (3, 55, 65) containing materials for producing a substance is revolved about a horizontal axis, at least while a process of producing th... | 06/15/1993 |
| 5180423 | Converter and method for top blowing nonferrous metal The invention provides a converter for purifying molten nonferrous material. A converter body having a refractory lined chamber holds the nonferrous material. A gas injector means pierces a lower portion of the chamber for bottom sparging the nonferrous m... | 01/19/1993 |
| 5141208 | Foundry plant with rotary furnaces and process of operation The process comprises the steps of mounting two rotary furnaces in series including a smelting station and a charge preheating station, effecting a smelting in the furnace at the smelting station while causing the fumes from the first furnace to pass thro... | 08/25/1992 |
| 4983214 | Method and apparatus for direct reduction of metal oxides A method and apparatus is disclosed for direct reduction of metal oxides, using a rotary kiln, fed with greenball pellets, the kiln having a feed-end and a discharge end. A first chamber within the kiln, and adjacent to the feed-end, is used for drying, p... | 01/08/1991 |
| 4838934 | Process for a direct reduction of iron oxide containing materials in a rotary kiln The charge is moved through a rotary kiln countercurrently to the gas atmosphere. Solid carbonaceous reducing agent having a high content of volatile constituents is charged into the rotary kiln at its charging end. Solid carbonaceous reducing agent havin... | 06/13/1989 |
| 4758268 | Method and apparatus for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous A method for the pyrometallurgical treatment of environmentally hazardous steelmill flue dust and sludges to separate and recover the volatile heavy metals from the flue dust material and to convert the remaining iron into recyclable directly reduced iron... | 07/19/1988 |
| 4728081 | Incinerating and melting apparatus Disclosed is an incinerating and melting apparatus for processing materials such as organic matters, inorganic matters and metals, which apparatus has a cylindrical or polygonal horizontal furnace body provided with a material charging port and a melt dis... | 03/01/1988 |
| 4676824 | Process for generating heat and producing sponge iron Sponge iron is produced by a direct reduction of iron oxide containing materials in a rotary kiln, the material discharged from the rotary kiln is separated into sponge iron and material which contains surplus carbon, the carbon-containing material is bur... | 06/30/1987 |
| 4645184 | Apparatus for preparing binder-free hot-briquets The invention relates to a process and an apparatus for preparing binder-free hot-briquets for smelting purposes from ferrous pyrophorous, finely divided solids, such as dry steelmaking-filter dust or slightly granular sponge iron from direct-reduction pl... | 02/24/1987 |
| 4547220 | Reduction of MoO3 and ammonium molybdates by ammonia in a rotary furnace A method is disclosed for the intermediate reduction of a molybdenum compound selected from the group consisting of MoO3 and ammonium molybdate to MoO2. The molybdenum compound is fed to an indirectly fired inclined rotary calciner a... | 10/15/1985 |
| 4515352 | Rotary furnace used for the production of ferrochromium Described is a method for the production of ferrochromium and a rotary furnace employed in such method. Raw chromium ores, fluxes and carbonaceous reducing agent(s) are charged into a rotary furnace into which oxygen or oxygen-enriched air are blown to ef... | 05/07/1985 |
| 4469509 | Process of producing sponge iron by a direct reduction of iron oxide-containing material in a rotary kiln In the operation of the rotary kiln provided at its charging end with a central burner, solid reducing agents having a high content of volatile constituents are used and the charge and the gas atmosphere are conducted in cocurrent streams. To avoid a high... | 09/04/1984 |
| 4462793 | Rotary kiln and method of using such a kiln This disclosure relates to a rotary kiln for heating and calcining lime, waste, etc. and to a method of direct reduction of metal oxide using such a kiln. A cylindrical outer shell is mounted for rotation on its axis, and a stationary inner tube extends i... | 07/31/1984 |
