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| Number | Title | Issue Date |
| 7955587 | System and method for the production of alpha type gypsum using heat recovery The present invention relates to a system and associated method for the production of gypsum in manufacturing plant. More specifically, the invention relates to the production of alpha-type gypsum in a gypsum board manufacturing plant. The system yields increased ef... | 06/07/2011 |
| 7951352 | Method for the production of alpha-calcium sulfate hemihydrate from calcium sulfate dihydrate Disclosed is a method for producing alpha-calcium sulfate hemihydrate from calcium dihydrate. Said method has the following features: a) calcium dihydrate is fed to an agitated autoclave (1); b) the agitated autoclave (1) is indirectly heated; c) water... | 05/31/2011 |
| 7897134 | System and method for calcining gypsum A system (100) for calcining natural gypsum, synthetic gypsum (112) or a combination thereof, the system including: a mill (114) for grinding and drying natural gypsum, synthetic gypsum (112) or a combination thereof, to produce dried gyp... | 03/01/2011 |
| 7700066 | Process for preparing alpha calcium sulfate hemihydrate The invention provides a process for preparing α-calcium sulfate hemihydrate which comprises the following steps: adding aqueous solutions containing sulfate ions and calcium ions to calcium chloride solution with a range of concentration; reacting the mixture of a... | 04/20/2010 |
| 7585485 | Process for the physiochemical conditioning of chemical gypsum or phospho-gypsum for use in formulation for cement and other construction materials The present invention is based on solid-state reaction or reactions in the presence of small amounts of water, between phospho gypsum and agglutinating-neutralizing agents, principally though the application of oxy and hydroxy compounds, without discounting use of t... | 09/08/2009 |
| 7556791 | Gypsum anhydrite fillers and process for making same A process is disclosed for making dead burn calcium sulfate anhydrite. The process includes a slurry calcination step to produce calcium sulfate anhydrite followed by removing free water from the anhydrite while avoiding substantial rehydration. Also disclosed are d... | 07/07/2009 |
| 7498014 | System and method for the production of alpha type gypsum using heat recovery The present invention relates to a system and associated method for the production of gypsum in manufacturing plant. More specifically, the invention relates to the production of alpha-type gypsum in a gypsum board manufacturing plant. The system yields increased ef... | 03/03/2009 |
| 7427384 | Method of reducing sulfur dioxide emissions of a circulating fluidized bed boiler A method of reducing sulfur dioxide emissions of a circulating fluidized bed boiler. Sulfur-containing carbonaceous fuel is fed to a furnace of the boiler, and calcium carbonate is fed to the furnace at a rate relative to the first stream such that the molar ratio o... | 09/23/2008 |
| 7351387 | Method for removing impurities accumulated in a scrubbing fluid A method for removing impurities accumulated in a scrubbing fluid in a flue gas scrubber and effluents from the scrubber. The flue gases are scrubbed with a scrubbing fluid that includes a calcium-containing absorbent. The scrubbing fluid containing gypsum and other... | 04/01/2008 |
| 7335254 | Alpha-type calcium sulfate hemihydrate compositions and methods of making same Disclosed is an improved alpha-type calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO4.½H2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihy... | 02/26/2008 |
| 7306776 | Method and an apparatus for processing flue gas scrubber material flows A method for processing flue gas scrubber material flows. The flue gas is scrubbed with a calcium-based absorbent containing washing fluid for absorbing sulphur oxides from the flue gases, and the formed gypsum slurry is directed from the flue gas scrubber to the se... | 12/11/2007 |
| 7288239 | Method for producing alkaline earth sulphate nanoparticles The invention relates to synthesis of nanoparticles, in particular to methods for producing nanoparticles with networks consisting of Z sulphate (Z=magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) or the binary mixtures thereof). The inventive method consis... | 10/30/2007 |
| 7285260 | Synthesis method for carbon material based on LiMM'(XO) Method of synthesis for a material made of particles having a core and a coating and/or being connected to each other by carbon cross-linking, the core of these particles containing at least one compound of formula LixM1−yM′y(XO | 10/23/2007 |
| 7273579 | Process for production of gypsum/fiber board An improved process calcining a gypsum/cellulosic fiber slurry to produce a composite gypsum/cellulosic fiber product resides in adding a selected crystal modifier to the gypsum/cellulosic fiber slurry prior to the heating step to reduce the time necessary to carry ... | 09/25/2007 |
| 7247284 | Method and apparatus for regeneration of flue gas scrubber caustic solutions A process to regenerate wet flue gas scrubber purge liquid into NaOH caustic suitable for make-up caustic for the scrubber is disclosed. Further, sulfur is removed from waste effluent in the form of gypsum with the process described herein. Lime is added to the spen... | 07/24/2007 |
| 7211235 | Method for producing hydrotalcites A method is described for the manufacture of hydrotalcites by using at least one compound of a bivalent metal (Component A) and at least one compound of a trivalent metal (Component B), wherein at least one of these components is not used in the form of a solution, ... | 05/01/2007 |
| 7179438 | Methods and apparatus for recovering gypsum and magnesium hydroxide The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide ... | 02/20/2007 |
| 7118718 | Gypsum decontamination process A process for reducing a level of radionuclei in a phosphogypsum material having a radioactive contaminant is provided, wherein the process includes the steps of: (a) mixing the phosphogypsum material with an acid decontamination solution to form a mixture; (b) sepa... | 10/10/2006 |
| 7117046 | Cascaded control of an average value of a process parameter to a desired value At least one of the multiple process parameters (MPPs) is a controllable process parameter (CTPP) and one is a targeted process parameter (TPP). The process also has a defined target limit (DTV) representing a first limit on an actual average value (AAV) of the TPP.... | 10/03/2006 |
| 7113835 | Control of rolling or moving average values of air pollution control emissions to a desired value A controller directs performance of a process having multiple process parameters (MPPs), including a controllable process parameter (CTPP), a targeted process parameter (TPP), a defined target value (DTV) representing a limit on an actual average value (AAV) of the ... | 09/26/2006 |
| 7071254 | Preparation containing gypsum from flue gas desulphurisation, method for using the same and use thereof The present invention relates to a composition, and a method of preparing and using the same. The composition contains at least one water-soluble or water-dispersible polymer or combinations thereof, and one or more filler particles that includes WDP gypsum particle... | 07/04/2006 |
| 7045110 | High yield co-production of anhydrous hydrogen bromide and sodium bisulfate A batch process for co-producing anhydrous hydrogen bromide and a purified bisulfate salt comprising: (a) charging a batch reactor with a bromide salt slurry, wherein the slurry is more than 50% by weight bromide salt; (b) reacting the slurry with sulfuric acid in a... | 05/16/2006 |
| 7045111 | High yield co-production of anhydrous hydrogen bromide and sodium bisulfate A process for co-producing anhydrous hydrogen bromide and a purified bisulfate salt by (a) reacting a bromide salt with sulfuric acid to produce crude hydrogen bromide and crude bisulfate salt; (b) purifying the crude hydrogen bromide to produce anhydrous hydrogen b... | 05/16/2006 |
| 6964704 | Calcium sulphate-based composition and methods of making same Disclosed is an improved alpha calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO4·½H2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihydrat... | 11/15/2005 |
| 6946108 | Flue gas desulfurization apparatus and flue gas desulfurization system, and method for operating flue gas desulfurization apparatus A flue gas desulfurization apparatus includes at least one activated carbon fiber board 20 provided in a catalyst unit 6, the board being formed by alternatingly juxtaposing one or more plate-like activated carbon fiber sheets and one or more corrugate... | 09/20/2005 |
| 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 |
| 6932952 | Method and apparatus for wet type flue-gas desulfurization A wet type exhaust gas desulfurization method includes sucking liquid in a liquid reservoir containing a sulphur compound formed from sulphur dioxide contained in exhaust gas so as to form a flow of the liquid, reducing the flow of the liquid in diameter to form a d... | 08/23/2005 |
| 6926912 | Metal compounds, mixed or sulphated, as phosphate binders A non-aluminum containing mixed metal compound for pharmaceutical use, which may, for example, be a mixed metal hydroxy carbonate containing magnesium and iron, and may have a hydrotalcite structure, preferably a non-aged hydrotalcite structure. Other metals, includ... | 08/09/2005 |
| 6896858 | Gas refining system A gas refining method for adsorbing a reducing gas obtained by pressure gasification of coal or oil comprises introducing a reducing gas stream into an adsorbing and removing zone where it contacts an adsorbent. Sulfur-containing compounds are adsorbed onto the adso... | 05/24/2005 |
| 6872373 | Flue gas processing apparatus and desulfurization method A flue gas processing apparatus for removing sulfur oxide contained in a gas, including a desulfurization tower through which the gas flows, the desulfurization tower including a catalyst unit having at least one activated carbon fiber board which adsorbs the sulfur... | 03/29/2005 |
| 6861041 | Method for treating and upgrading effluents containing metallic sulphates using an ammonia addition step A method for treating and upgrading effluents containing at least a metallic sulphate comprising adding at least a base to the effluent to precipitate the metallic ions in the form of iron oxy-hydroxides Fe(OHx) wherein x=2 and/or 3; separating the precip... | 03/01/2005 |
| 6827914 | Method, apparatus and use of chelating agents for the purification of calcium sulphate A chemical process for the purification of CaSO4 utilizes the ability of an aqueous solution of a chelating agent to selectively dissolve CaSO4 in that the initial extraction can be carried out at certain pH and CaSO4 can be recovere... | 12/07/2004 |
| 6780391 | Method of producing surgical grade calcium sulphate A method of producing surgical grade calcium sulphate suitable for use as resorbable osteoconductive bone void filler material. The method comprising forming an initial calcium sulphate di-hydrate from synthetic constituents; dehydrating the initial calcium sulphate... | 08/24/2004 |
| 6726889 | Production of zinc oxide from acid soluble ore using precipitation method The present invention relates to an apparatus and a process for producing zinc oxide from an acid soluble zinc-bearing material. The process according to the present invention comprises the steps of leaching the zinc oxide material with sulphuric acid; precipitating... | 04/27/2004 |
| 6706113 | Method for producing an anhydrite III or α based hydraulic bonding agent A process for synthesizing a hydraulic binder based on natural calcium sulfate (gypsum), the process consisting in heating the calcium sulfate to obtain a large proportion of anhydrite III or α anhydrite, and then in quenching. The process consists in: completely d... | 03/16/2004 |
| 6685902 | Procedure and apparatus for the cleaning of flue gases containing sulfur dioxide A process for cleaning flue gases containing ash and sulfur dioxide produced by burning sulfur-containing coal in the combustion chamber of a circulating fluidized-bed firing system includes delivering a particulate SO2 sorbent into the combust... | 02/03/2004 |
| 6656440 | Exhaust gas desulfurizing method and system therefor A method and system for desulfurizing flue gas in which desulfurization is effected by bringing absorbent slurry containing limestone into contact with flue gas. The method classifies absorbent slurry extracted from a desulfurization absorber, returns a f... | 12/02/2003 |
| 6652825 | Method of producing calcium sulfate alpha-hemihydrate A method of producing calcium sulfate -hemihydrate is disclosed, including the steps of exposing a mixture including a calcium sulfate form selected from the group consisting of calcium sulfate dihydrate, calcium sulfate ଲ-hemihydrate, water-... | 11/25/2003 |
| 6613141 | Recovery of cement kiln dust through precipitation of calcium sulfate using sulfuric acid solution A method and apparatus for recovering calcium sulfate di-hydrate (gypsum) from a precipitation reaction between cement kiln dust and commercial, spent or waste grade sulfuric acid solution. The gypsum recovered from this process acts as a necessary functi... | 09/02/2003 |
| 6555082 | Method for wet flue gas desulfurization and device for implementing said method A method and apparatus for wet flue gas desulfurization in a two-circuit washer having two washers for an absorption agent based on suspensions containing calcium compounds, a sump for supplying the absorption agent to the first washer, and a container fo... | 04/29/2003 |
