Class 75/477 - Introducing solid reductant into rotary kiln

Subclass of Class 75 - Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
Definition: Process wherein a solid substance which reduces an Iron
No. of patents: 23
Last issue date: 12/13/2011

Number	Title	Issue Date
8075665	Reduction treatment apparatus and method of reduction treatment A reduction treatment apparatus can include a reduction furnace configured to reduce zinc and/or iron oxide through heat treatment of zinc-containing iron oxide or zinc oxide or iron oxide, with a reducing material. The reduction treatment apparatus also has an oxid...	12/13/2011
7806959	Metallic iron nuggets Metallic iron nuggets made by reducing-melt of a material containing a carbonaceous reductant and a metal-oxide-containing material, the metallic iron nuggets comprising at least 94% by mass, hereinafter denoted as “%”, of Fe and 1.0 to 4.5% of C, and having a d...	10/05/2010
6629839	Method and apparatus for charging raw and carbonaceous materials into a moving hearth furnace The invention provides a method and apparatus for charging a raw material and a carbonaceous material, in which a reduced product generated on a hearth can be quickly melted for reliable separation into a metal and slag, and the metal and the slag can be ...	10/07/2003
6390810	Method and apparatus for reducing a feed material in a rotary hearth furnace A rotary hearth furnace for reducing a feed material is disclosed. The rotary hearth furnace includes a rotating hearth disposed in an enclosure and mounted for rotary movement. The enclosure includes an annular inner wall, an annular outer wall and a roo...	05/21/2002
6296479	Direct reduction method and rotary hearth furnace Raw materials, including a metal oxide and a carbonaceous material, are supplied into a rotary hearth furnace. Then, the raw materials are heated and reduced by burners, which are arranged to cause a strong stirring action for an atmosphere around the raw...	10/02/2001
6273932	Continuous metal melting process A continuous process is provided for rapid melting of a variety of virgin and recycled ferrous and non-ferrous metals. This is accomplished by distributing the introduction of the unmelted charge materials and hence the melting heat requirements along an ...	08/14/2001
6221127	Method of pyroprocessing mineral ore material for reducing combustion NOx A method of pyroprocessing mineral ores, such as iron ore. The method includes receiving a preheated product stream of iron-containing pellets at an infeed end of a rotary kiln and introducing an oxidizing gas into the tumbling bed toward the infeed end o...	04/24/2001
5992335	Method of blowing synthetic resin into furnace and apparatus therefor A method for blowing a synthetic resin material into a furnace which comprises processing film-shaped synthetic resins into a first granular resin material; crushing non-film-shaped synthetic resins into a second granular resin material; pneumatically fee...	11/30/1999
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
5660805	Method for beneficiating titanium-bearing material containing iron A process for beneficiating particulate titanium-bearing ore containing iron oxides is disclosed. The first step of the process entails prereducing the ore to convert about 20-90 percent of the iron oxides in the ore to metallic iron. Next, the prereduced...	08/26/1997
4772316	Process for the reduction of iron-containing chrome ores Process for the reduction of iron containing chrome ores in which a mixture of chrome ore, coal and slag producers with an ore-coal ratio of 1:0.4 to 1:2 is heated in a rotating furnace in a CO containing atmosphere to temperatures of between 1100° and 1...	09/20/1988
4740239	Process for exploitation of low grade oxidic and iron-bearing complex ores or concentrates A process for the exploitation of low-grade oxidic and iron-bearing complex ores or concentrates, whereby the initial materials are reduced in a rotary kiln at a temperature of 1000°-1500° C. in such a manner that the products are a magnetic fraction pr...	04/26/1988
4676741	Radiantly heated furnace A radiantly heated, travelling hearth furnace having a supplementary feed means positioned intermediate the initial loading point and the final take-off point to increase the capacity of the furnace for treating objects fed thereto. When the objects are p...	06/30/1987
4581061	Method for reducing oxidic iron ores in a rotary kiln In a reduction process carried out in a rotary kiln in which oxygen-containing gases are introduced by way of nozzles and at least a part of the highly volatile solid reductants are introduced from the discharge end so as to be distributed over a substant...	04/08/1986
4443250	Process of producing sponge iron by a direct reduction of iron oxide-containing materials Fine-grained material which contains iron oxide is prereduced in a fluidized bed and is subsequently completely reduced in a rotary kiln. In order to avoid agglomeration and incrustation in the rotary kiln, the prereduction is carried out to effect a meta...	04/17/1984
4389242	Interior arrangement for direct reduction rotary kilns and method A method and means for maximizing the use of the kiln capacity in a rotary kiln, directly reducing metal oxides using solid carbonaceous materials as the source of fuel and reducant, is disclosed involving the creation of an annular dam arrangement within...	06/21/1983
4378244	System for coal injection in iron oxide reducing kilns A method and means for improved control of the process for directly reducing materials containing iron oxides in a rotary kiln using a solid carbonaceous reducing agent, such as coal, introduced from the charge feed and discharge ends of the kiln, as the ...	03/29/1983
4330325	Direct reduction rotary kiln with improved air injection In the direct reduction process for reducing iron ore to sponge iron of the type disclosed in U.S. Pat. No. 3,890,138 to Hockin wherein all of the air supply tubes along the rotary kiln inject air toward the discharge end of the kiln it has been found tha...	05/18/1982
4312666	Steel making process Residual materials which become available in metallurgy and contain oxides and volatilizable non-ferrous metals or compounds thereof are treated in a rotary kiln with solid carbonaceous reducing agents and are thus directly reduced in a high proportion to...	01/26/1982
4306643	Coal feed pipe and positioner A system for feeding coal or other material blown from a pipe in a desired trajectory is disclosed including a positioning device for applying directional force to the midsection of the pipe to produce slight bending for orienting the free end, which devi...	12/22/1981
4304597	System for control of sinter formation in iron oxide reducing kilns A method and means for improving control of the process for directly reducing ores containing iron oxide in a rotary kiln using a solid carbonaceous reducing agent, such as coal, introduced from the ore feed and discharge ends of the kiln, as both fuel an...	12/08/1981
4268304	Direct reduction process in a rotary kiln An improved process for the direct reduction of iron oxide-containing materials to form sponge iron which takes place in a rotary kiln by treatment with a solid carbonaceous reducing agent having a high content of volatile combustible constituents is disc...	05/19/1981
4238222	Waelz process of volatilizing zinc and lead from iron oxide-containing materials In a Waelz process of volatilizing zinc and lead from iron-containing and oxide-containing material in an inclined rotary kiln, which is charged at its upper end with the material together with solid carbonaceous reducing agent having a high content of vo...	12/09/1980

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Class 75/477 - Introducing solid reductant into rotary kiln