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6083465 |
Method and apparatus for continuously calcining gypsum
An apparatus for continuously calcining gypsum includes a flash calcining impact mill, a feed bin adjacent the impact mill for holding gypsum, and a gypsum feed control mechanism for supplying...
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6054101 |
Method and Device for heat-treating plaster
Disclosed is a method and device for heat-treating plaster which is calcined to form hemihydrate plaster or anhydrite. Calcining to form hemihydrate plaster is carried out in at least one fluid bed...
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5743954 |
Method for continuous refractoryless calcining of gypsum
A method and apparatus is disclosed for the continuous calcining of gypsum material in a high-efficiency, refractoryless kettle preferably heated by a multiple series of separate immersion tube...
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5437850 |
Method for calcining moist gypsum
Both the drying and also the removal of the water crystalization take place carefully in a respective fluidized bed apparatus (A, B) without any danger of overheating. This is achieved by a...
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5248487 |
Process for the conversion of calcium sulfate dihydrate into alpha-hemihydrate
In a process for the conversion of calcium sulfate dihydrate originating in flue gas desulfurization units into an alpha-hemihydrate, a salt solution is used as a medium. The salt solution consists...
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5174972 |
Fluorogypsum waste solidification material
A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting...
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5169617 |
Method of treating produced gypsum
A method for treating produced gypsum and, in particular, a method for treating flue-gas desulfurization gypsum forms highly active, modifiable gypsum binders of high strength with simultaneously...
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5015450 |
Process for making calcium sulfate alpha-hemihydrate from calcium sulfate dihydrate
The process makes calcium sulfate alpha-hemihydrate from finely divided calcium sulfate dihydrate by transforming the calcium sulfate dihydrate in the presence of saturated steam. A molded body is...
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5015449 |
Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization
The process makes calcium sulfate alpha-hemihydrate or essentially plaster of paris from finely divided gypsum made by desulfurizing flue gas obtain from a power plant fired by brown coal by...
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5011668 |
Calcination apparatus
In a method and apparatus for calcining calcium sulphate dihydrate or like heat sensitive material, in which a bed of the material is heated in a vessel (41) by the direct introduction of a hot gas...
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4963513 |
Coal gasification cogeneration process
The present invention relates to the coproduction of a combustible gas stream usable as an energy source, a sulfur-dioxide-containing second gas stream usable as a source of oxidant in the...
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4842842 |
Process for producing α-form gypsum hemihydrate
Disclosed herein is a method for producing α-form gypsum hemihydrate, comprising heating an aqueous slurry containing gypsum dihydrate and a salt of sulfosuccinic acid as the catalyst for...
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4744969 |
Process for the conversion of coal and gypsum to valuable products
The present invention relates to the coproduction of a combustible feed gas stream useable as an energy source and a sulfur-containing second gas stream useable as a feedstock for the production of...
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4533528 |
Process for continuously calcining gypsum to low dispersed consistency stucco
Wet chemical gypsum cake may be directly fed to a continuous kettle calciner to produce a stucco having lowered dispersed consistency. Pre-drying of the chemical gypsum is eliminated and the thus...
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4495162 |
Preparation of a calcium sulfate anhydrite material of low chloride content
A calcium sulfate anhydrite material is prepared from a spent absorbent resulting from desulfurization of flue gases. First the sulfite in the spent absorbent is oxidized into sulfate, preferably...
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4309391 |
Lump process alpha gypsum
An improved "lump" process for producing alpha gypsum, calcium sulfate hemihydrate, from natural gypsum rock of the type wherein lumps of gypsum rock particles (a minimum of about 1/2 inch or 1.3...
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4234345 |
Method for producing hard plaster of paris
Fast-setting alpha calcium sulfate hemihydrate made from calcium sulfate dihydrate by hydrothermally recrystallizing calcium sulfate dihydrate to form a mixture containing 95%-99% by weight alpha...
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4113836 |
Continuous gypsum calcination process and kettle therefor
Continuous calcination of gypsum is provided by uniformly feeding uncalcined gypsum into the calcining batch in a kettle to a location below the surface but above the uppermost agitator, and...
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4101630 |
Continuous calcining of gypsum
A continuous calciner, particularly advantageous in converting gypsum to plaster, with two coaxial cylindrical walls, provides for heating air within the inner cylinder and then directing the air,...
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4086099 |
Method of preparing plaster
A method of preparing plaster by brief contact between gypsum and a hot gas. The method comprises introducing the gypsum through the axial tube of a nozzle, around which a helical stream of hot...
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4080422 |
Method for producing insoluble calcium sulfate anhydrite
Naturally occurring or man-produced calcium sulfate dihydrate is subjected to a process which involves concomitant flash calcination, utilizing co-current contact of the gypsum with a gaseous heat...
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3797758 |
METHOD OF PRODUCING FINELY DISPERSED ALPHA CALCIUM SULFATE HEMIHYDRATE
A method for producing finely dispersed alpha calcium sulfate hemihydrate. The hemihydrate has a solvent retention of at least 0.85 milliliters toluene per gram. The method includes grinding alpha...
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3437330 |
CONTINUOUS PRODUCTION OF ALPHA PLASTER
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3423172 |
PRODUCTION OF PLASTER OF PARIS
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3378246 |
Calcining kettle discharge apparatus
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3326633 |
Process for removing impurities from by-product gypsum
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3236509 |
Process and apparatus for continuous calcining of powdered gypsum rock
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3158441 |
Semi-continuous material treatment process
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3081152 |
Process for calcination of gypsum
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2994523 |
Calcining of gypsum
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2956859 |
Preparation of anhydrite
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2913308 |
Process for the production of high strength low consistency calcined gypsum
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2907667 |
Process of calcining gypsum
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2907668 |
Calcination of gypsum
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2901321 |
Two-step method of making calcium oxide from calcium sulfate
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2848210 |
Dehydrating gypsum or the like
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2848211 |
Dehydrating gypsum or the like
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2822242 |
Manufacture of calcium sulphate anhydrite from gypsum, calcium carbonate and sulfuric acid
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2788960 |
Continuous calcination process and apparatus therefor
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3773892 |
Title is not available
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