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| Number | Title | Issue Date |
| 8029618 | Manufacture of Portland cement using spent claus catalyst Spent Claus catalyst having a high alumina content is used as an ingredient in the manufacture of Portland cements in place of all or a portion of a conventional source of alumina. The spent Claus catalyst is preferably of a small particle size and can be ground to ... | 10/04/2011 |
| 7699930 | Apparatus and method for feeding materials to a cement mill A flow enhanced calcium sulfate product includes a calcium sulfate source material, such as a flue gas desulphurization by-product, is pre-blended with a granular feedstock exhibiting good cementitious properties. The flow enhanced calcium sulfate is fed to a cement... | 04/20/2010 |
| 7611576 | Method and plant for processing waste A municipal or like refuse is crushing, mixing with crushed limestone, dry up in two stages—by hot air and by part of solid products of pyrolysis which other part goes on washing out and filtration. Pyrolysis is carried out in two stages—due to heat of the speci... | 11/03/2009 |
| 7481878 | Activated clays from oil contaminated drill cuttings A method for the preparation of activated clays and cement additives from contaminated drill cuttings is provided. The substrate can be mixed with a mineral acid in a first reactor. The acidified substrate is then mixed with alkaline earth in a second reactor. The r... | 01/27/2009 |
| 7310581 | Bulk material analyzer system A real-time bulk material analyzing system is disclosed for analyzing the elemental characteristics of bulk material passing by the system on a moving conveyor belt. An exemplary embodiment includes a source of illumination emitting white light for exciting bulk mat... | 12/18/2007 |
| 7273015 | Method and apparatus for combustion of residual carbon in fly ash A system for combustion and removal of residual carbon within fly ash particles in which the fly ash particles are fed into an array of process units for combustion. The fly ash particles are subjected to heat and motive air such that as the fly ash particles pass t... | 09/25/2007 |
| 7265254 | Waste processing method, waste processing system, integrated waste processing method, and integrated waste processing system Chlorine-containing waste is processed inside a heating device, an alkali metal compound and a calcium compound are given into the heating device while the temperature of a solid phase inside the heating device is maintained at 400 to 1500° C., chlorine that is con... | 09/04/2007 |
| 7258737 | Method for recycling concrete waste A method for recycling concrete waste includes the steps of: a) heating the concrete waste to provide a measure of fragility to the concrete waste; b) milling and sieving the heated concrete waste to separate coarse aggregate from the concrete waste; and c) milling ... | 08/21/2007 |
| 7195743 | Waste treatment Disclosed is a combination instrument steriliser (13, 210) and biomedical waste processor (15, 211). Both units are supplied steam from a common steam boiler (30, 212). In preferred embodiments, the waste processor utilises a shredder comprising... | 03/27/2007 |
| 7189074 | Method and process for co-combustion in a waste to-energy facility The co-combustion process may comprise the following unit operations: routing of hot gas (10) generated in the clinker cooling process to a rotary kiln (1); use of part of the rotary kiln exhaust gas to dry solid wastes in rotary dryers; leading the ga... | 03/13/2007 |
| 7135068 | Method for oxidizing treatment of steel works slag and resulting LD slag A treatment method includes injecting oxygen into the liquid steel works slag, adding and dissolving in the slag alumina and lime sources, and optionally silica and iron sources and cooling the slag until solidification, the additions being carried out in such amoun... | 11/14/2006 |
| 7047894 | Method and apparatus for combustion of residual carbon in fly ash A system for combustion and removal of residual carbon within fly ash particles in which the fly ash particles are fed into an array of process units for combustion. The fly ash particles are subjected to heat and motive air such that as the fly ash particles pass t... | 05/23/2006 |
| 7037368 | Mid-kiln injection of waste-derived materials A method for the production of cement clinker comprises the introduction of non-traditional materials into the kiln, preferably at a mid-kiln locations. The non-traditional materials are materials that are difficult, expensive or environmentally challenging for disp... | 05/02/2006 |
| 6939523 | Method of removing SO3 from flue gases A calcium hydroxide slurry is injected into the off gases in the exhaust duct of an industrial plant which burns sulfur containing fuels. The calcium hydroxide slurry reacts with SO3 produced as a result of the combustion process and forms a primary solid... | 09/06/2005 |
| 6908507 | Process and a plant for the production of Portland cement clinker A process is disclosed for producing cement clinker, comprising the steps of: a) providing a mixture of ground calcareous materials and ground argillaceous materials; b) heating the mixture of step a) to a temperature sufficient to calcine and fuse the ground materi... | 06/21/2005 |
| 6905996 | Method of making a ceramic article This invention provides methods for making ceramic articles with improved density, compression strength and efflorescence properties, in which a pre-ceramic article containing direct process residue gel is heated at an elevated temperature. ... | 06/14/2005 |
| 6875267 | Process and device for feeding dispersible solid fuels into the calcinator of a cement clinker production line In order to make sure, for cement clinker production lines with blown injection of dispersible solid fuels such as, for example, coal dust, into the calcinator which is provided with fuel, that an open flame does not occur at the fuel injection point, it is proposed... | 04/05/2005 |
| 6855302 | Method for emission control of dioxin and/or furan waste gas pollutants in a cement clinker production line In order to provide a comparatively simple and cost-effective method for cement clinker production lines where especially raw materials and/or fuel/secondary fuel containing chlorine compounds and a partial gas extraction with an electrostatic dust collector as wast... | 02/15/2005 |
| 6764544 | Process for incorporating coal ash into cement clinker A method of cement clinker manufacture comprises feeding a clinker feed material containing a source of calcium carbonate into a feed end of a cement kiln, the feed material is heat processed in the kiln to produce cement clinker with emission of carbon dioxide from... | 07/20/2004 |
| 6752865 | Process for manufacturing of high iron hydraulic cement clinker The present invention describes a process for manufacture of high iron hydraulic cement clinker in production of cement and cementation binder for application in construction activity and in metallurgical industry for sintering of iron ore fines and making cold bond... | 06/22/2004 |
| 6740157 | Method for cement clinker production using vitrified slag A method for the production of cement clinker comprises the introduction of vitrified slag into the feedstock stream prior to the clinkering zone. The addition of vitrified slag can increase the clinker output rates and/or reduce the energy requirements for maintain... | 05/25/2004 |
| 6733583 | Process for producing a blended cement having enhanced cementitious properties capable of combination with class C fly ash The present invention provides a method of producing a blended cement capable of meeting ASTM C-595 and C-1157 standards. The blended cement of the present invention contains portland cement clinker, calcium sulfate and volcanic ash. The volcanic ash utilized by the... | 05/11/2004 |
| 6709510 | Process for using mill scale in cement clinker production A process for forming cement clinker using mill scale that may have hydrocarbons associated therewith. Normal feedstock material is preheated and then transferred to a combustion area. The mill scale is also transferred to the combustion area where, during the proce... | 03/23/2004 |
| 6709509 | Portland cement manufacture from slag from the production of magnesium metal A process for the production of Portland cement and white Portland cement using magnesium furnace slag, a waste product from the manufacture of magnesium metal, as a primary starting material. The furnace slag is blended with calcium oxide and silicon dioxide to for... | 03/23/2004 |
| 6695911 | Method and installation for production of cement clinker In the production of cement clinker or cement with the addition of a cement additive (40), such as for example slag, which is ground in a closed-circuit grinding installation into slag meal (32) of equal fineness to cement, in order to utilize excess slag... | 02/24/2004 |
| 6695909 | Concrete with improved freeze/thaw characteristic An improved freeze/thaw characteristic is achieved in concrete by substituting crumb rubber for entrained air. The percent by volume of entrained air for concrete prescribed for a given set of freeze/thaw conditions is first determined then a predetermine... | 02/24/2004 |
| 6685771 | Introducing an additive to portland cement The present invention provides methods and systems of incorporating a mineral based particulate into Portland cement including agglomerating a particulate material and an agglomerating material to produce an additive, introducing the additive into a raw f... | 02/03/2004 |
| 6593262 | Porosifying, solidification-accelerating additive for binding agent building materials, and process of producing A porosifying, solidification-accelerating additive for binding agent building materials consisting of Al2 O3, 50-90%; MgO, 4-20%; SiO2, 0.5-15%; AlN, 0.1-5%; Fe2 O3, 0.1-5%; CaO, 0.1-5%; F, 0.1-5%; N... | 07/15/2003 |
| 6514334 | Cementitious mixture A process for making a hydraulic cementitious mixture, which process comprises the steps of: (i) providing a first granular composition (A) comprising expressed in terms of weight percent on an oxide basis: SiO2 55 to 80, Al2 O3... | 02/04/2003 |
| 6491751 | Method for manufacturing cement using a raw material mix including finely ground steel slag A method is provided for manufacturing cement from a raw material mixture which includes finely ground steel slag. Selected quantities of steel slag and other raw materials are mixed with each other and supplied to a raw mill. The steel slag and other raw... | 12/10/2002 |
| 6488766 | Aggregate using recycled plastics The present invention comprises an aggregate for use in cementitious building materials which-successfully incorporates plastic such as recycled plastic scrap of diverse types and a abrasive, inorganic grit particles. The plastic scrap is impregnated with... | 12/03/2002 |
| 6478870 | Process aid for preparing a flowable slurry A process for preparing a flowable slurry comprising mixing 25-70 wt. % water; an alkaline material selected from the group consisting of chlorosilicon manufacturing byproducts, direct process residue gels, cement kiln dust, and mixtures thereof; and a pr... | 11/12/2002 |
| 6471767 | Process for recycling gypsum-based waste material into readily crushable members for use in the manufacture of cement and crushable members formed thereby A process for forming crushable, "synthetic" rocks from waste gypsum involves collecting natural and synthetic gypsum waste in the form of flue gas desulfurization ("FGD"). The gypsum waste has a sludge-like consistency and is passed through an extruder w... | 10/29/2002 |
| 6468345 | Process for producing both steam power and cement clinker simultaneously in one apparatus its products, apparatus and use The present invention discloses a process for producing both steam power and the fast-burnt cement clinker/fast burnt modified coal ash simultaneously in one apparatus, the fast-burnt cement clinker/fast-burnt modified coal ash prepared by said process as... | 10/22/2002 |
| 6416574 | Method and apparatus for recycling cement kiln dust Methods for recycling cement kiln dust are described and involve heating a mixture containing at least one additive, water, and cement kiln dust for a sufficient time and at sufficient temperatures to form cement clinker. The additive contains an organic ... | 07/09/2002 |
| 6391107 | Method for the utilization of residual materials in the production of cement Within the known Muller-Kuhne process and a corresponding installation, a utilization of a great variety of residual materials can be achieved with optimum process control, both in regard to the production of a raw powder and the fuel, whereby this is mad... | 05/21/2002 |
| 6391105 | Enhancement of cement clinker yield The yield of cement clinker recovered from a kiln assembly is enhanced by feeding a particulate material comprising silica and an oxide of at least one of calcium and aluminum, for example, fly ash into contact with hot cement clinker; the fly ash melts t... | 05/21/2002 |
| 6361596 | Process for converting well drill cuttings into raw materials for the production of cement, and cement compositions obtained therefrom This process for converting well drill cuttings into raw materials for the production of cement includes the steps of extracting limestone and clay, crushing and prehomogenizing the extracted materials, raw grinding and adjusting the composition by adding... | 03/26/2002 |
| 6287379 | Apparatus and method for disposing rubber waste material during the manufacturing of products which are heated in a rotary kiln 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 manufactu... | 09/11/2001 |
| 6190449 | Method for eliminating waste sulfurous acids coming from industrial treatments and for obtaining stable products The method comprises the steps of: preparing a belitic crude cement, neutralizing waste sulfurous acids by means of at least clay-calcareous fines which are thus transformed into artificial gypsum, and adding said artificial gypsum to the belitic crude ce... | 02/20/2001 |
