Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Reexamination Certificate
1999-06-10
2001-09-11
Marcantoni, Paul (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
Reexamination Certificate
active
06287379
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the manufacturing of products produced using rotary kilns and more particularly, to a method and apparatus for utilizing rubber as fuel in a rotary kiln system.
2. Description of the Related Art
Vulcanized rubber waste such as industrial rubber and, in particular, tires present a disposal problem. Although considerable effort has been expended on a variety of approaches, scrap tire disposal procedures still present considerable logistic problems. Generally, many scrap tires have been disposed in landfill operations. These operations tend to create unstable landfills. No further use is made of the tire material. The tires are not biologically degradable.
Finely ground scrap rubber can be utilized in rubber reclaim processes. However, such processes are generally expensive in order to obtain the desired size of scrap rubber. Chemical procedures have also been proposed to utilize the raw material in vulcanized tires. However, to date, this has found limited acceptance.
It has also been proposed in the art to dispose of rubber base products such as industrial rubber waste and scrap tire and utilize their inherent heat value. Thus, for example, U.S. Pat. No. 3,946,680 teaches a process for burning used whole tires on a bed of particles of incombustible matter. The heat generated from the burning of the tires may be supplied to a boiler or used for other purposes.
SUMMARY OF THE INVENTION
It is therefore a principal object of the present invention to provide effective treating of waste rubber materials, which method minimizes the creation of environmental pollution and which may be utilized in different manufacturing operations.
This and other objects are achieved by the present invention which, in a broad aspect, is a method of manufacturing products which are produced using a rotary kiln to heat up raw materials introduced therein, the rotary kiln being of the type having an inlet end, an intermediate zone, a burning zone and a discharge end. The method of manufacturing includes firstly introducing raw material at an inlet end of a rotary kiln. The raw material is then passed through an intermediate zone of the rotary kiln. It is then passed through a burning zone of the rotary kiln. Waste rubber material is introduced as at least a portion of fuel while the raw material passes through the burning zone adjacent to the discharge end.
Thus, there is provided a method for disposal of scrap rubber products wherein the rubber material is utilized as a fuel source in a manufacturing process utilizing a rotary kiln. The process may be utilized in the manufacture of refractory materials, aluminum or alumina from bauxite, any various cement-making processes, or the manufacture of iron from iron ore.
The method of the present invention may be utilized, as previously mentioned, in different manufacturing processes. Thus, rotary kilns are utilized in the process for manufacturing iron wherein a mixture of coal or coke and iron ore is heated in a rotary kiln. Similarly, bauxite is heated in rotary kilns to a temperature of approximately 1,100° C. in aluminum manufacturing process. In manufacturing lime, limestone or lime hydroxide is heated in a rotary kiln to approximately 850° C. to produce lime. In the cement manufacturing process, a cement material is fed into a rotary kiln and converted into a cement clinker at a temperature range of typically between 1000-1500° C.
In a preferred aspect of the present invention, scrap rubber is utilized in a cement making process and the rubber is utilized in various portland cement clinker making operations which employ a rotary kiln. Thus, one may practice the present invention either in the wet or dry kilns; in the wet process, the materials, ground and if necessary, blended, are fed to the rotary kiln as slurry. In the semi-wet process, the slurry is converted to nodules and preheated before entering a shorter kiln. In the drying process, raw materials are ground, blended and fed to the kiln in the dry state. They may go through one or more pre-heater zones. The iron from steel radial tires used in the process of the present invention enhances the cement producing process. Iron is one of the ingredients in the raw meal.
Other objects, advantages, and novel features will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
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Ginsberg Lawrence N.
Marcantoni Paul
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