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This page is updated frequently with new Gypsum-related patent applications. Subscribe to the Gypsum RSS feed to automatically get the update: related Gypsum RSS feeds. RSS updates for this page: Gypsum RSS RSS


Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery

Method of treating strong basic aluminum production waste

Date/App# patent app List of recent Gypsum-related patents
08/21/14
20140231698
 Reaction material and chemical heat pump patent thumbnailReaction material and chemical heat pump
A reaction material for a chemical heat pump includes type iii anhydrous gypsum, a magnesium compound, and caxmg1-xso4. The reaction material for the chemical heat pump structurally changes between a compound including type iii anhydrous gypsum, the magnesium compound, and caxmg1-xso4, and a compound including hemihydrate gypsum, a hydrate of the magnesium compound, and a hydrate of caxmg1-xso4 when subjected to heat storage process and heat release process.
08/21/14
20140231359
 Treatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery patent thumbnailTreatment of phosphate-containing wastewater with fluorosilicate and phosphate recovery
A method for treating phosphate-containing wastewater, such as phosphogypsum pond water. The method includes the steps of: (a) adding a first cation to the wastewater to precipitate fluorosilicate from the wastewater; (b) adding a second cation to the wastewater to precipitate fluoride from the wastewater; (c) raising the ph of the wastewater to precipitate the second cation from the wastewater; (d) removing residual silica from the wastewater; and (e) precipitating phosphate from the wastewater.
08/14/14
20140227545
 Antimicrobial size emulsion and gypsum panel made therewith patent thumbnailAntimicrobial size emulsion and gypsum panel made therewith
Disclosed is an emulsion of an internal paper size and a biocidal emulsifying agent, such as a cationic non-starchy quaternary ammonium compounds, that is introduced into a paper-making furnish to produce an anti-microbial paper. The antimicrobial paper is useful as facing for gypsum panels.
08/07/14
20140217323
 Method of treating strong basic aluminum production waste patent thumbnailMethod of treating strong basic aluminum production waste
Disclosed is a method of treating a strong basic aluminum production waste. The method includes preparing an aluminum production waste; and mixing the aluminum production waste with gypsum..
07/31/14
20140212351
 Air pollution control system, air pollution control method, spray drying device of dewatering filtration fluid from desulfurization discharged water, and method thereof patent thumbnailAir pollution control system, air pollution control method, spray drying device of dewatering filtration fluid from desulfurization discharged water, and method thereof
To include a boiler 11 that burns fuel f, an air heater 13 that recovers heat of flue gas 18 from the boiler 11, a first precipitator 14 that reduces dust in the flue gas 18 after heat recovery, a desulfurizer 15 that reduces sulfur oxides in the flue gas 18 after dust reduction by an absorbent, a dewaterer 32 that reduces gypsum 31 from desulfurization discharged water 30 discharged from the desulfurizer 15, a spray drying device 34 including an atomizer that atomizes a dewatering filtration fluid 33 discharged from the dewaterer 32, and a flue-gas introducing line l11 that introduces a part of the flue gas 18 into the spray drying device 34.. .
07/31/14
20140208796
 Evaporative chiller patent thumbnailEvaporative chiller
An evaporative chiller utilizes an evaporative-cooled gypsum-ceramic casting to chill air passing through a passageway formed within the casting. Placed within an outer housing, the gypsum-ceramic casting has an outer wicking layer that maintains water saturation of the casting.
07/31/14
20140208684
 Jointing and surface compound for construction elements, its preparation process and building process of a structure patent thumbnailJointing and surface compound for construction elements, its preparation process and building process of a structure
The object of the invention is a drying compound comprising from 50 to 85% of fgd gypsum and/or natural or processed gypsum, in mass percentages based on the total mass of the compound, presenting the following particle size characteristics: (i) a d50 from 35 to 70 μm and (ii) a span (d90-d10/d50) lower than 2. The object of the invention is also a preparation process of the compound according to the invention.
07/24/14
20140205861
 Reinforced board and method of producing thereof patent thumbnailReinforced board and method of producing thereof
Reinforced boards and/or walls, and methods of producing thereof. In some non-limiting examples, there is provided a reinforced gypsum board and a process for the production thereof.
07/24/14
20140205745
 Method and use of organic and mineral admixtures for emi and radioactive isotope shielding of building materials such as glass fiber wall coverings, gypsum wallboard and electrically conductive or resistive, high performance, high strength concrete patent thumbnailMethod and use of organic and mineral admixtures for emi and radioactive isotope shielding of building materials such as glass fiber wall coverings, gypsum wallboard and electrically conductive or resistive, high performance, high strength concrete
A method is disclosed for the use of an organic admixture composed of a polysaccharide such as hydroxypropylcellulose and a monosaccharide such as ethoxylated methylglucoside and de-ionized water and minerals such as zeolites for electromagnetic; radio and microwave frequency and radioisotope shielding of building materials such as wall liners, gypsum wallboard and high performance, high strength concrete.. .
07/24/14
20140202362
 Air pollution control system, air pollution control method, spray drying device of dewatering filtration fluid from desulfurization discharged water, and method thereof patent thumbnailAir pollution control system, air pollution control method, spray drying device of dewatering filtration fluid from desulfurization discharged water, and method thereof
To include a boiler 11 that burns fuel f, an air heater 13 that recovers heat of flue gas 18 from the boiler 11, a first precipitator 14 that reduces dust in the flue gas 18 after heat recovery, a desulfurizer 15 that reduces sulfur oxides in the flue gas 18 after dust reduction by an absorbent, a dewaterer 32 that reduces gypsum 31 from desulfurization discharged water 30 discharged from the desulfurizer 15, a spray drying device 34 including an atomizer that atomizes a dewatering filtration fluid 33 discharged from the dewaterer 32, and a flue-gas introducing line l11 that introduces a part of the flue gas 18 into the spray drying device 34.. .
07/10/14
20140190020
Rotary cutter
Embodiments according to the present invention provide improved rotary cutters and associated methods. A cutter includes a handle coupled to a plurality of rotary cutting elements which may be rotatable substantially within the same plane, within closely spaced parallel planes, or within intersecting planes, wherein the intersection of such planes occurs substantially tangential to the rotary cutting elements.
07/03/14
20140186643
Light weight gypsum board
The invention generally provides gypsum-containing slurries including stucco, naphthalenesulfonate dispersant, and pregelatinized starch. The naphthalenesulfonate dispersant is present in an amount of about 0.1%-3.0% by weight based on the weight of dry stucco.
06/26/14
20140178624
Base-mediated hydrophobing compositions and processes
Water-resistant gypsum boards and compositions and methods for their manufacture are provided. The methods include forming a mixture of water, hydroxide, and siliconate, adding siloxane to the mixture, adding calcium sulfate hemi-hydrate to the mixture to form an aqueous slurry, curing the aqueous slurry under heat, drying the aqueous slurry, and forming a water-resistant gypsum board..
06/12/14
20140163210
Processes and apparatus for lignin separation in biorefineries
The present invention generally provides methods of improving lignin separation during biomass fractionation with an acid to release sugars and a solvent for lignin (such as ethanol). In some embodiments, a digestor is employed to fractionating a feedstock in the presence of a solvent for lignin, sulfur dioxide, and water, to produce a liquor containing hemicellulose, cellulose-rich solids, and lignin.
06/12/14
20140161692
Production method for high-purity calcite and ammonium sulphate by using gypsum
Provided is a recycling method for producing calcite and ammonium sulfate having a high purity of at least 95% and generated by means of a carbonation reaction for fixing carbon dioxide inside the crystal structure of a mineral, and in which waste gypsum is reacted with carbon dioxide, which is a greenhouse gas, such that the carbon dioxide is fixed as a stable mineral, and high-purity calcite and ammonium sulfate are produced as resultant products.. .
06/12/14
20140158273
Lightweight, reduced density fire rated gypsum panels
A reduced weight, reduced density gypsum panel that includes high expansion vermiculite with fire resistance capabilities that are at least comparable to (if not better than) commercial fire rated gypsum panels with a much greater gypsum content, weight and density.. .
06/05/14
20140150693
Surfactant-coated hemihydrate gypsum and production method thereof
The residual rate of the surfactant when the surfactant-coated hemihydrate gypsum is heated up to 300° c. Is not less than 40 wt % of the amount of the surfactant before heating..
05/22/14
20140142215
Gypsum materials
Such a granulated hydrophobic additive is able to provide a high initial hydrophobicity to gypsum materials to which it is applied and that the obtained hydrophobicity can last during a long period of time.. .
05/15/14
20140131280
Process for working up mine waters
In a process for mine waters, a hardness-free, alkaline reagent is first added at least once to the mine water that is to be worked up, whereby metals are sedimented or precipitated out as hydroxides from the mine water that is to be worked up. The precipitated metal hydroxides are separated off and the remaining mine water is further treated by adding a hardness-forming precipitation reagent, whereby gypsum, in particular in the form of gypsum mud, is precipitated out from the then metal-free mine water that is to be worked up.
05/15/14
20140130715
Method for forming products from a flue gas desulfurization by-product and products formed thereby
Compositions and methods for producing a manufactured product, a method for making a liquid absorbent, and processes for disposal of flammable liquids with a flue gas desulfurization by-product. The compositions for the manufactured products combine a binder and the by-product.
05/08/14
20140124291
Gypsum-panel acoustical monolithic ceiling
An acoustical panel for forming a monolithic ceiling or wall, the panel extending across a rectangular area, and having a core made primarily of gypsum, the core being essentially coextensive with the panel area such that it has two opposed sides, each of an area substantially equal to the area of the panel, the core having a multitude of perforations extending generally between its sides, the perforations being distributed substantially uniformly across the full area of the core and being open at both sides of the core, the face side of the core being covered by a porous layer, the perforations being optionally restricted at a rear side of the core, the porous layer at the face side of the core being suitable for adherence of drywall joint compound and a water-based non-blocking paint.. .
05/08/14
20140123591
Non-aqueous rapid setting drywall compound and method of use
A non-aqueous drywall compound being the combination of a first component mixture of acetone, a non-aqueous liquid adhesive containing ethyl cyanoacrylate, and a powder containing calcium sulfate hemihydrate (plaster of paris), the mixture being a pliable putty capable of adhering to gypsum wallboard or similar work surfaces. The second component of the drywall compound is an accelerator or activator containing acetone and toluene.
05/01/14
20140121303
Gypsum-containing construction material compounds
The invention relates to gypsum-containing construction material compounds, containing gypsum, if necessary one or more polymers, if necessary one or more aggregates, and if necessary one or more additives, characterised in that the gypsum-containing construction material compounds contain one or more types of cement and one or more types of pozzolana.. .
04/24/14
20140113241
Calcining kettle
A calcining kettle includes a cylindrical housing having a hot air chamber at one end, a dust collecting chamber at an opposite end and a calcining chamber between the hot air chamber and the dust collecting chamber, at least one air pad disposed between the hot air chamber and the calcining chamber, each air pad being supported by air pad supports for passage of hot air therethrough. At least one rake is disposed within the calcining chamber and configured for rotation about a vertical axis, the at least one rake stirring gypsum located adjacent to the at least one air pad.
04/24/14
20140113025
Heat-resistant composition for animals, comprising an enzymatic mixture
The invention relates to a heat-resistant composition for animals in the form of a granular powder, comprising: a) a liquid mixture of at least two enzymes; b) a medium selected from the group comprising wheat flour, starch, gypsum, maltodextrin, and corn cobs; and c) a coating agent selected from the group comprising cellulose and the derivatives thereof, chitin, carrageenan, sodium alginate, vegetable gums, gums obtained using a fermentation process, and starches and derivatives.. .
04/17/14
20140105797
Precipitation of zinc from solution
A method of precipitating a zinc containing solid from an acidic solution containing dissolved zinc and magnesium comprising contacting the solution with a calcium containing neutralising agent to raise the ph of the solution to 4.5 to 7.5 at a temperature of from 70 to 95° c. To thereby precipitate a solid zinc containing material and gypsum without causing substantial precipitation of magnesium, and separating the zinc containing material from the gypsum..
04/10/14
20140100307
Light-weight composition and mix for masonry, mortar and stucco
A pre-mixed mortar, stucco or masonry composition includes from 70 to 80 percent sand and from 20 to 30 percent of a light-weight cement mix composition that comprises either slag cement, gypsum or a combination of slag cement and gypsum; portland cement; clay; and polystyrene.. .
04/03/14
20140093447
System and method for using board plant flue gases in the production of syngas
Disclosed is an apparatus and method for capturing the hot humid gases from a gypsum board dryer and utilizing those gases in the production of a synthetic gas (referred to as “syngas”). The syngas produced can then be utilized within a gypsum board plant to reduce the amount of natural gas needed.
03/27/14
20140083326
Dental gypsum-bonded investment material powder
The invention provides a dental gypsum-bonded investment material powder which can inhibit air bubbles from being generated in a mixed material, only by being mixed with water without using any special device or tool, and is easily mixed with the water. A specific siloxane is blended at a specific amount in relation to the dental gypsum-bonded investment material powder which includes an anionic surfactant and is excellent in a mold releasing action.
03/20/14
20140079942
Fire-retardant coating, method for producing fire-retardant and heat-resistnat building materials
The present invention relates to a fire-retardant material and products produced therefrom. More specifically, one embodiment of the present invention relates to a fire-retardant coating that shields underlying substrates from thermal insult, and a method for making such fire-retardant composition, as well as the products resulting therefrom.
03/13/14
20140073711
Additives in gypsum slurries and adjusting their proportions
A gypsum slurry is provided that includes calcium sulfate hemihydrate; water; a dispersant component comprising at least one of the following a comb-branched polymer with polyether side chains, naphthalene sulfonate-formaldehyde condensate or melamine sulfonate-formaldehyde condensate; a foaming agent; and a polycondensation component with three polycondensation repeating units. Also provided is a method for making a gypsum slurry with a foaming agent in which the ratio between the dispersant component and the polycondensation component is adjusted to control for the size of foam bubbles in the gypsum slurry.
03/06/14
20140066547
Additive for building product mixtures containing flow agents
Claimed is a cationic copolymer and also its use as an admixture agent for building product systems, especially based on calcium sulfate. The copolymers of the invention effectuate accelerated setting behavior in clay-containing as well as non-clay-containing gypsums and they enable uncurtailed water reduction performance by dispersant agents used at the same time with the copolymers.
02/20/14
20140047785
Fire door
An insulated fire door includes a door shell having spaced first and second exterior panels and a gypsum panel between the first and second exterior panels. The insulated fire door includes a plurality of spacers bonded across an interior side of each of the first and second exterior panels.
02/13/14
20140044619
Process for converting fgd gypsum to ammonium sulfate and calcium carbonate
A continuous countercurrent flow process for converting fgd gypsum to ammonium sulfate and calcium carbonate including countercurrent flows with internal recycle of liquids to maximize the purity of reaction products while minimizing reaction times, and further include embodiments of the process that provide a yield of both ammonium sulfate and calcium carbonate to be 97 to 100%, and embodiments that provide for processes having a total time of reaction being 8 to 12 minutes, the invention further including processes for removing contaminants from the fgd gypsum employing an acid rinse process and/or a slurry tank reactor process.. .
02/13/14
20140044485
System for producing a gypsum slurry for irrigation
A system includes a conveyor providing an agricultural grade gypsum, a pump providing a fluid, a mixing device configured to mix the agricultural grade gypsum provided by the conveyor with the fluid provided by the pump to produce a gypsum slurry, and a slurry pump configured to pump the gypsum slurry from the mixing device to a storage tank.. .
02/06/14
20140034047
Processes and apparatus for lignin separation in biorefineries
The present invention generally provides methods of improving lignin separation during lignocellulosic biorefining, comprising the steps of (i) catalyzing fractionation or hydrolysis with an acid to release sugars into an acidified solution containing lignin, (ii) neutralizing the acidified solution with a base to form a salt in a neutralized solution; (iii) in a separation unit, separating the salt and the lignin, each in free or combined form, from the neutralized solution; and then (iv) recycling a portion of the salt and optionally a portion of the lignin to step (i) to combine, physically or chemically, with the lignin, to improve lignin separation in the separation unit. In certain embodiments, the acid is a sulfur-containing acid and the base is lime, forming gypsum which is then recycled, in part, to the hydrolysis reactor..
01/30/14
20140030173
Process for continuous modification of dihydrate gypsum and modified dihydrate gypsum obtained by the process
A process for the continuous modification of dihydrate gypsum includes calcining dihydrate gypsum into hemihydrate gypsum and recrystallizing the hemihydrate gypsum in an aqueous slurry to convert the hemihydrate gypsum into modified dihydrate gypsum of different crystalline form. The aqueous slurry in a recrystallization reaction tank is maintained at a constant temperature under stirring, and a feed rate of the hemihydrate gypsum to the recrystallization reaction tank and a discharge rate of the recrystallized dihydrate gypsum are controlled to substantially equal.
01/30/14
20140026786
Method and apparatus for manufacturing gypsum products
A method and system for producing a gypsum product comprising a mixer for mixing gypsum and water and two foam feeds into the system wherein the foam feeds each comprise foam of different bubble size distributions.. .
01/23/14
20140020603
Gypsum manufacturing process improvement
The present application provides a method for analyzing a raw material for manufacturing of gypsum products, analyzing a plurality of gypsum products, and the gypsum products produced therefrom. Desirably, the analyzing of the raw material is conducted using prompt gamma neutron activation analysis..
01/23/14
20140020399
Method and device for generating electricity and gypsum from waste gases containing hydrogen sulfide
The apparatus according to the invention is characterized by a current generation device in which supplied hydrogen sulphide-containing exhaust gases are burnt, preferably with air being supplied, the energy released during combustion being employed at least partially for current generation.. .
01/16/14
20140017026
Self-drilling wall anchor device
A self-drilling wall anchor device comprises a threaded member having a first threaded section and a second threaded section that provide different diameters, and an outer sleeve having a through hole that provides connective first area, second area, and third area. A second area diameter of the second area is larger than a first diameter of the first threaded section but smaller than a second diameter of the second threaded section.
01/02/14
20140000979
Gypsum-panel acoustical monolithic ceiling
An acoustical panel for forming a monolithic ceiling or wall, the panel extending across a rectangular area, and having a core made primarily of gypsum, the core being essentially coextensive with the panel area such that it has two opposed sides, each of an area substantially equal to the area of the panel, the core having a multitude of perforations extending generally between its sides, the perforations being distributed substantially uniformly across the full area of the core and being open at both sides of the core, the face side of the core being covered by a porous layer, the perforations being optionally restricted at a rear side of the core, the porous layer at the face side of the core being suitable for adherence of drywall joint compound and a water-based non-blocking paint.. .
01/02/14
20140000978
Gypsum-panel acoustical monolithic ceiling
An acoustical panel for forming a monolithic ceiling or wall, the panel extending across a rectangular area, and having a core made primarily of gypsum, the core being essentially coextensive with the panel area such that it has two opposed sides, each of an area substantially equal to the area of the panel, the core having a multitude of perforations extending generally between its sides, the perforations being distributed substantially uniformly across the full area of the core and being open at both sides of the core, the face side of the core being covered by a porous layer, the perforations being optionally restricted at a rear side of the core, the porous layer at the face side of the core being suitable for adherence of drywall joint compound and a water-based non-blocking paint.. .
01/02/14
20140000196
Gypsum composites used in fire resistant building components
A composite product includes gypsum in an amount of 60 to 90% by weight, fibers in an amount of 1.5 to 26% by weight substantially homogeneously distributed through the composite, and a rheology-modifying agent in an amount of 0.5 to 6% by weight. The composite is caused or allowed to cure to form a cured composite.
01/02/14
20140000195
Gypsum composites used in fire resistant building components
A composite product includes gypsum in an amount of 70 to 90% by weight, fibers in an amount of 1.5 to 26% by weight substantially homogeneously distributed through the composite, and a rheology-modifying agent in an amount of 0.5 to 6% by weight. The composite is caused or allowed to cure to form a cured composite.
12/26/13
20130344250
Process for forming an adhesive bond
An adhesion bond strength enhancer for cementitious adhesive mortar is disclosed. The adhesion enhancer improves bond strength between the mortar and relatively hydrophobic plastic material, such as extruded polystyrene boards and expanded polystyrene boards of the type generally employed in exterior insulation finishing systems (“eifs”).
12/19/13
20130338270
Gypsum-containing product
The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material..
12/12/13
20130330536
Method of reducing ceiling tile sag and product thereof
Sag in ceiling tiles is reduced by the present coated ceiling tile and method which decreases sag in the coated ceiling tiles. Calcined gypsum and water are combined to form a coating which is applied to the back side of a base ceiling tile in a thin layer of about 100 micrometer to about 1000 micrometers.
12/12/13
20130330532
Dispersant containing gypsum slurry
The subject of the present invention is a gypsum containing aqueous slurry containing a phosphate based polycondensate as sole agent with dispersing properties. With a phosphated polycondensate according to the invention as sole dispersing component an improved efficiency was found in comparison with the polycondensates known in the prior art.
12/12/13
20130326985
Aqueous gypsum plaster-cement composition and its use
An aqueous gypsum plaster-cement composition comprises a hydraulic binder consisting of calcined gypsum and hydraulic cement in a weight ratio of from about 4:1 to about 2:1, an aggregate which comprises sand, a foam, a perlite, rice hulls or a mixture thereof, a superplasticizer comprising an air entraining agent, a retarder, and water in an amount of from about 0.4 to about 0.75 parts by weight per part of binder, with the proviso that the gypsum plaster-cement composition contains essentially neither a pozzolana nor lime. The use thereof, a method of constructing buildings using this composition and the buildings obtainable in this way are also described..
11/28/13
20130316163
Moisture-resistant gypsum boards and slurries for making same
A gypsum board comprises a cover sheet and a gypsum layer disposed on the cover sheet. The gypsum layer comprises the reaction product of an isocyanate, water, and stucco.
11/28/13
20130315805
Process for simultaneous production of potassium sulphate, ammonium sulfate, magnesium hydroxide and/or magnesium oxide from kainite mixed salt and ammonia
The present invention provides an integrated process for the recovery of sulphate of potash (sop), ammonium sulphate and surface modified magnesium hydroxide and/or magnesium oxide utilizing kainite mixed salt and ammonia as the only consumable raw materials. The process involves treating kainite mixed salt with water to obtain solid schoenite and a schoenite end liquor.
11/28/13
20130312925
Manufacture and use of a composite structure containing precipitated carbonate
A precipitated carbonate polysaccharide structure which, when used as a filler, improves the structural strength of paper or board, or gypsum boards, plastics or gums, among others, as well as the stiffness level and optical properties (brightness and opacity) of the paper or board, together or separately with other fillers; carbonates, in particular. The invention further improves the setting of printing ink on the surface of the paper or board.
11/21/13
20130309139
Flue-gas desulfurization equipment
In flue-gas desulfurization equipment, in order to gypsumize sulfur dioxide in a byproduct at approximately 100% and to make desulfurization rate approximately 100%, the flue-gas desulfurization equipment (1) according to the present invention is provided with a basket-shaped rotation cylinder (20) arranged in the fixing duct (10) in a state of being supported rotatably around a horizontal shaft (21), a rotation packed bed (30) formed by filling fillers for gas-liquid contact in the basket-shaped rotation cylinder (20), a slurry storage tank (40) having plural communication storage sections (41) located below the rotation packed bed (30) and divided by separation plates (43) each of which has a communication part (43a), and slurry spraying means (63) which are provided corresponding to the plural communication storage sections (41) and which spray the absorbent slurry extracted from the corresponding communication storage sections (41) to upper parts of the communication storage section (41) in the rotation packed bed (30) respectively.. .
11/21/13
20130305962
O/w wax dispersions and gypsum products obtainable from these
The invention relates to o/w wax dispersions based on water, an emulsifier and a wax phase containing predominantly aliphatic hydrocarbons and polar compounds having chain lengths of at least 18 carbon atoms, and also plaster compositions comprising the o/w wax dispersion, and the use of the o/w wax dispersion.. .
11/14/13
20130299059
Method for constructing composite building boards using dissolvable films
Disclosed are building board manufacturing techniques that minimize the build-up of slurry on associated forming equipment and also produce panels with enhanced physical properties. The methods involve applying a dissolvable film laminate to one or more fiber mats at the outset of the forming process.
10/31/13
20130289167
Hydraulic binder composition
Compositions comprising a hydraulic binder such as cement or gypsum and a hydroxypropyl guar derivative that comprises unsubstituted linear or branched c6-c8 alkyl chains possess excellent water retention characteristics.. .
10/31/13
20130288887
Method for preparing a nano-calcium carbonate slurry from waste gypsum as calcium source, the product and use thereof
The present invention discloses a process for producing a nano calcium carbonate slurry from a feedstock of waste gypsum, wherein: an aqueous gypsum slurry of the feedstock is mixed with ammonia water by stirring; with co2 injected in the slurry is under continuous stirring until the calcium sulfate in the waste gypsum is completely carbonated into nano calcium carbonate; after filtration, the filter cake is dispersed in water to obtain the nano calcium carbonate slurry. This process is easy to operate and to obtain a low-cost and a lower decomposition temperature of calcium carbonate.
10/17/13
20130274505
Process for producing a lactic ester from a fermentation liquor containing ammonium lactate
The present invention relates to an industrial process for producing a lactic ester containing in total at least seven carbon atoms, from a fermentation liquor containing ammonium lactate in order to avoid the inherent production of gypsum, with a high yield and according to which the loss of lactic ester in the form of lactamide is limited as much as possible.. .
10/10/13
20130263760
Inorganic material board
An inorganic material board, which is a cured mat formed by dehydrating a slurry including 30 to 53 wt % of blast furnace slag, 2 to 5 wt % of gypsum having an average particle size of 200 to 2000 μm, 5 to 11 wt % of alkaline material, 5 to 15 wt % of reinforcing fibers, and 31 to 50 wt % of inorganic admixture with respect to a total solid content, and in which a weight ratio of the blast furnace slag to the gypsum to the alkaline material is 1:0.05 to 0.15:0.15 to 0.35. It is desirable that the blast furnace slag has a specific surface area of 3000 to 5000..
09/26/13
20130251951
Wood strand cement boards with a prctically closed surface and production process
A mineral bonded wood strand cement (usually portland cement or magnesite or gypsum) board which is produced from a mixture of wood strands or a similar fibre material, water, a suitable binder like cement, and possibly additives, which mixture is cured under pressure to form a board with a practically entirely closed surface. For the boards according to the invention, wood strands are being used that are broader and thinner than used until presently in acoustic wood wool cement boards.
09/26/13
20130251938
Polycarboxy emulsion copolymer binder compositions
The present invention provides flexible binder compositions comprising one or more polycarboxy emulsion copolymer has a measured tg of 40° c. Or less, such as from −45° c.
09/26/13
20130248078
Slurries and methods of making light weight gypsum board
The invention generally provides gypsum-containing slurries including stucco, naphthalenesulfonate dispersant, and pregelatinized starch. The naphthalenesulfonate dispersant is present in an amount of about 0.1%-3.0% by weight based on the weight of dry stucco.
09/19/13
20130240291
Acoustical sound proofing material with improved fracture characteristics and methods for manufacturing same
A material for use in building construction (partition, wall, ceiling, floor or door) that exhibits improved acoustical sound proofing and fracture characteristics optimized for efficient installation. The material comprises a laminated structure having as an integral part thereof one or more layers of viscoelastic material which also functions both as a glue and as an energy dissipating layer; and one or more constraining layers, such as gypsum or cement-based panel products modified for easy fracture.
09/19/13
20130240111
Acoustical sound proofing material with improved fracture characteristics and methods for manufacturing same
A material for use in building construction (partition, wall, ceiling, floor or door) that exhibits improved acoustical sound proofing and fracture characteristics optimized for efficient installation. The material comprises a laminated structure having as an integral part thereof one or more layers of viscoelastic material which also functions both as a glue and as an energy dissipating layer; and one or more constraining layers, such as gypsum or cement-based panel products modified for easy fracture.
09/12/13
20130232769
Wallgrip screw
A fastener for securing drywall to wood or metal substrate. The fastener includes a dual threaded head drywall fastener with hexagon driving collar.
08/22/13
20130216762
Gypsum products with high efficiency heat sink additives
Disclosed herein are gypsum products with at least one high efficiency heat sink additive. The gypsum products, e.g., gypsum panels, are less susceptible to the damaging effects of extreme heat as the temperature rises due to the presence of the at least one additive..
08/22/13
20130213873
Device for precipitating suspended materials
A device for precipitating suspended materials from a liquid, in particular for precipitating gypsum from water, having a vessel comprising a liquid inlet and a liquid outlet, and subdivided into chambers that are in sequence in the flow direction by means of partitions, wherein the liquid inlet opens into a first of the chambers and the liquid outlet opens into a last of the chambers. At least one part of the chambers and preferably every chamber communicates with the chamber downstream thereof in the flow direction by means of an opening in the partition disposed between the chambers.
08/22/13
20130212895
Method for the use of heat energy from gasification sources in gypsum board production
The present invention relates to an improved method for using heat energy in a gypsum board plant. More specifically, the method contemplates taking heat from a gasifier, or other alternative heat source, and using it to dry gypsum boards.
08/15/13
20130209722
Gypsum board with multiple tapered edges
A gypsum board with multiple tapered edges has a flat, rectangular main flat body with four tapered edges. The main flat body is a gypsum core sandwiched between two paper sheets.
08/08/13
20130199872
Gypsum panel having outstanding sound-absorbing properties and a production method therefor
Disclosed is a gypsum panel having outstanding sound-absorbing properties whereby it is possible to impart various aesthetic effects while also having outstanding sound-absorbing effects. The gypsum panel having outstanding sound-absorbing properties according to the present invention comprises: a perforated gypsum body having a plurality of holes, and a sound-absorbing cover layer which is attached to one side of the gypsum body and which has through-holes of a smaller size than the holes, wherein the mean diameter of the through-holes is between 10 and 40 μm..
08/08/13
20130199418
Dried gypsum composition and gypsum-based coating
Disclosed is a dry gypsum composition containing hemihydrate gypsum, at least one pigment and a crystal habit modifier. The crystal habit modifier is at least one compound selected from the group consisting of sulfate salts, carboxylate salts, carbonate salts and inorganic chlorides, and a content of the at least one compound is in a range of 0.1 to 5 parts by mass per 100 parts by mass of the hemihydrate gypsum, whereby upon hydration of the hemihydrate gypsum into dihydrate gypsum, the dihydrate gypsum is controlled to become plate crystals having an aspect ratio of 1 to 9.
08/08/13
20130199413
Montan wax substitute for gypsum products
A method of manufacturing a water-resistant gypsum product including forming an aqueous mixture of gypsum, water and a wax mixture, wherein the wax mixture includes a hydrocarbon wax, and a substitute material selected from the group consisting of (a) an asphaltite, (b) a polyolefin homopolymer, (c) a polyolefin copolymer, and (d) combinations thereof; and forming the mixture into a structure, and drying the structure while permitting hydration of the gypsum to form a gypsum product.. .


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Gypsum topics: Calcium Sulfate, Calcium Carbonate, Carbon Dioxide, Attenuation, Water Retention, Carbon Atoms, Ammonium Lactate, Dispersant, Accelerator, Crosslinker, Polymer Binder, Ion Sources, Ion Source, Heat Exchanger, Downstream

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This listing is a sample listing of patent applications related to Gypsum for is only meant as a recent sample of applications filed, not a comprehensive history. There may be associated servicemarks and trademarks related to these patents. Please check with patent attorney if you need further assistance or plan to use for business purposes. This patent data is also published to the public by the USPTO and available for free on their website. Note that there may be alternative spellings for Gypsum with additional patents listed. Browse our RSS directory or Search for other possible listings.
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