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7588634 |
Process for manufacturing ultra low consistency alpha- and beta- blend stucco
A process is disclosed for making a blend of alpha- and beta-stucco including a slurry calcination step to produce alpha calcium sulfate hemihydrate followed by a fluidized bed calcination step to...
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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...
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7575735 |
Metal oxide and metal fluoride nanostructures and methods of making same
The present invention includes pure single-crystalline metal oxide and metal fluoride nanostructures, and methods of making same. These nanostructures include nanorods and nanoarrays.
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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...
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7517514 |
Process for treating residue of organic material
A process for treating organic material, separating calcium and recovering phosphorus and to utilization of the obtained products and their use as a soil conditioner and a fertilizer as well as for...
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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...
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7476372 |
Flue gas scrubbing process utilizing biosolids
A method for reducing acid gases in a flue gas, the method comprising reacting biosolids comprising a scrubbing agent with a flue gas comprising an acid gas, thereby reducing the amount of acid gas...
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7468169 |
Process for producing calcium trisulfoaluminate and apparatus for use in said process
This invention provides a production process, which can stably produce high-quality satin white (calcium trisulfoaluminate) having very small and homogeneous particulate shapes suitable for...
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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...
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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...
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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...
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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),...
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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...
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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...
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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...
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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 (CaSO 4 ·½H 2 O) [alpha-type] compound are disclosed, at least...
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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 SO 3 produced as...
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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...
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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...
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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...
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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...
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6827914 |
Method, apparatus and use of chelating agents for the purification of calcium sulphate
A chemical process for the purification of CaSO 4 utilizes the ability of an aqueous solution of a chelating agent to selectively dissolve CaSO 4 in that the initial extraction can be carried out...
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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...
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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...
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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...
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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...
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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...
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6652825 |
Method of producing calcium sulfate alpha-hemihydrate
A method of producing calcium sulfate α-hemihydrate is disclosed, including the steps of exposing a mixture including a calcium sulfate form selected from the group consisting of calcium sulfate...
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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...
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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...
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6533943 |
Process for the removal of oxidizing agents
A synthesized compound that is able to neutralize oxidizing agents such as nitrates from water systems, from ground surfaces and other sites. When contaminated water is passed through the...
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6517790 |
Converting fluorgyp to calcium sulfate
Fluorgyp is converted to calcium sulfate by reacting sulfuric acid in the fluorgyp with calcium carbonate having a small particle size. The resulting product is useful as a set retarding agent for...
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6428760 |
Method for desulfurizing exhaust gas
The present invention relates to the improvement of a replenishment method of a magnesium-based compound and to the improvement of a double decomposition method, which can be used in a magnesium...
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6387240 |
Method for the removal of sulfur in the nickel leaching process
Invention relates to a method for the removal of sulfur from the leaching cycle of nickel processes such as leaching of nickel matte. According to the method, anolyte generated in nickel...
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6379639 |
Process for purification of flue gas
A method for purifyiing flue gas derived form incinerators burning refuse, wood, or sludge, in which the flue gas is cooled in a spray drier. A dust remover removes the dust from the flue gas. The...
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6365122 |
Process for manufacturing potassium sulfate fertilizer and other metal sulfates
A new process of preparing potassium sulfate fertilizer and other metal sulfates from the chlorides and other halides of these metals. The process utilizes the discovery that sulfur dioxide or...
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6333012 |
Process for producing ammonium metavanadate
A process is provided for preparing ammonium metavanadate from the combustion ashes resulting from the combustion of petroleum fuels in a boiler by using the ammonium sulfate and vanadium...
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6254843 |
Process for the reclamation of calcium sulfite produced by a calcium-based FGD system
A method of producing calcium sulfate with a flue gas scrubbing facility having a gas-liquid contactor that uses a calcium-based slurry to absorb sulfur dioxide from a flue gas containing acidic...
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6245314 |
Calcium sulfide oxidation method
CaS oxidation has CaS particles oxidized into CaSO 4 completely as far as to the interior of the particle. The interior of an oxidation apparatus 1 is partially partitioned by a partition 22 to...
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6203769 |
Process for the treatment of fluoboric electrolyte
The invention relates to a method for the treatment of fluoboric electrolyte resulting from the processes of electro-extraction of metals such as copper and lead comprising a leaching stage with...
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6197200 |
Method of purifying flue gas waste slurries for use in gypsum production
A method of purifying a flue gas desulfurization aqueous waste slurry containing calcium-sulfur salts and residual solid grits, fly ash, carbon and oils by supplying the aqueous waste slurry to a...
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6187277 |
Method for purifying gases
A method is provided for removing sulfur dioxide and carbon dioxide out of gases from, for example, the combustion of sulfur containing fossil fuels. The sulfur dioxide and carbon dioxide...
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6171387 |
Reversible agglomeration of fine particle plaster of Paris
A method for the reversible agglomeration of fine particles of plaster of Paris (CaSO 4 .1/2H 2 O) and agglomerates made by the method which comprises agitating the fine particles in the presence...
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6096279 |
Flue gas treating process and system
Flue gas is treated for the presence of SO 3 , without resorting to ammonia injection, by adding a powder into the flue gas and subsequently bringing the flue gas into gas-liquid contact with an...
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6090355 |
Method and device for cleaning flue gases from furnaces
A method for scrubbing flue gases of furnaces includes subjecting the flue gases with addition of activated carbon particles to wet scrubbing in a wet scrubbing device. Activated carbon particles...
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6086842 |
Recycling of sodium hydroxide and production of gypsum from dry flue gas desulfurization
The present invention is directed towards a system that makes high quality gypsum from a dry flue gas desulfurization process which utilizes a low temperature regeneration of the carbon adsorbent...
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6033637 |
Method for treating combustion ashes
A method is provided for treating ashes from the combustion of petroleum fuels by mixing the combustion ashes with water to produce a slurry; injecting either calcium oxide or calcium hydroxide...
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6027704 |
Process for the reduction of SO.sub.2 from wet lime/limestone tailgas in power plant desulfurization processes
This invention describes a process for the scrubbing of sulfur oxides from the effluent of conventional wet lime/limestone SOx reduction processes in coal or oil-fired plants. The sulfur oxides are...
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6024932 |
Method for the conversion of gypsum to elemental sulfur
A process for the recovery of sulfur and carbon monoxide from metal sulfates in which the carbon monoxide is recycled as a reducing agent for reaction with the metal sulfate. Metal sulfates such as...
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6010664 |
Oxidation detection for sulfite/sulfate systems
A method for monitoring the oxidation rate in a flue gas desulfurization system having a slurry comprises locating a monitor in the system for accessing the slurry. A sample is periodically drawn...
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