Abstract:
La invención proporciona una forma novedosa de construcción de paredes de paneles de yeso y/o cemento, con gran resistencia y durabilidad, y capaz de montarse o formarse en su posición, sin la estructura metálica o de madera habitual y costosa para soportar la misma, tal como es necesario para satisfacer la demanda moderna de reducir la cantidad de materiales estructurales que requieren el empleo de mano de obra calificada para su instalación y de esa forma efectuar una reducción del costo de construcción diseñada para viviendas y otras edificaciones. La invención se refiere composiciones de mezcla seca que comprenden éteres de celulosa, sulfato de calcio semihidratado y dihidratado, éter de almidón pre gelatinizado y polimero acrílico reedispersable con utilidad de adhesivo acelerado para unir y adherir paneles de yeso y cemento
Abstract:
Beschrieben wird ein Verfahren zur Herstellung von Schwefelsäure und Zementklinker unter Verwendung von Kalziumsulfat, das in einer Phosphorsäureproduktion bei der Umsetzung von Rohphosphat mit Schwefelsäure zur Bildung von Phosphorsäure als festes Nebenprodukt gebildet und abgetrennt wird, wobei das Verfahren folgende Schritte umfasst: a) das von der Phosphorsäure abgetrennte Kalziumsulfat wird mit einer Säure behandelt, um eine Suspension mit gereinigtem Kalziumsulfat zu erhalten, b) das gereinigte Kalziumsulfat wird als Feststoff von der flüssigen Phase der erhaltenen Suspension abgetrennt, wobei die erhaltene flüssige Phase in die Reaktionseinheit der Phosphorsäureproduktion als Einsatzstoff eingebracht werden kann, c) das abgetrennte gereinigte Kalziumsulfat wird mit Zusatzstoffen und Reduktionsmittel vermischt, um eine Rohmehlmischung für die Zementklinkerproduktion zu erhalten, d) die Rohmehlmischung wird gebrannt, um den Zementklinker zu erhalten, wobei Schwefeldioxid als Abgas gebildet wird, e) das gebildete Schwefeldioxid einer Abgasreinigung unterzogen wird und f) als Rohstoff einer Schwefelsäureproduktion zugeführt, um die Schwefelsäure herzustellen, wobei die hergestellte Schwefelsäure als Einsatzmaterial in der Phosphorsäureproduktion verwendet wird. Das Verfahren ist insbesondere ein integriertes Verfahren. Der integrative Ansatz als Gesamtkonzept vom Phosphorgips zum Zementklinker und Schwefeldioxid berücksichtigt die Anforderungen in einem bestehenden Phosphorsäure- und Schwefelsäurekomplex.
Abstract:
A method of mining gypsum includes: in-situ leaching gypsum in a harvesting bed, such as a leach pad 5, in an existing gypsum resource with a leach liquor and dissolving or otherwise washing gypsum and producing upgraded gypsum in the harvesting bed. The method also includes harvesting or otherwise removing upgraded gypsum from the harvesting bed and transporting upgraded gypsum directly as a marketable product to a port or other location.
Abstract:
Additives including sulfur-containing compounds are used in methods of treating synthetic gypsum. The additives can thermally stabilize heavy metals, such as mercury. This thermal stabilization reduces mercury release from the synthetic gypsum. Illustrative, non-limiting examples of sulfur- containing compounds include inorganic sulfides, organic sulfides, organic compounds containing nitrogen and sulfur, organic compounds containing oxygen and sulfur, and polymers containing sulfur.
Abstract:
A method of conditioning stucco comprises the steps of supplying a quantity of stucco particles to a reaction vessel, the stucco particles comprising calcium sulphate hemihydrate and/or calcium sulphate anhydrite, as well as calcium sulphate dihydrate; and conditioning the stucco particles at a temperature of at least 100°C and a humidity of at least 70%. During the step of conditioning the stucco particles, the bulk density of the stucco particles within the reaction vessel is at least 1 g/cm 3 .
Abstract:
The Invention is related to increasing of early strength and final strengths of cements classified under EN and ASTM as Portland or CEM cements and also related to all clinker employing cements and to any kinds which employ calcium sulphates for set optimization and is for composing of new cements by only assesing new methods for production and is for composing of new cements by only assessing new methods to formation and inclusion of calcium sulphate resources which are used for set optimization.A new calcium sulphate resource is obtained by employing lower heats and this input is arranged to different dehydration levels at which they can be most efficient for the selected use. These different dehydration levels are called intermediate phases of dehydrate or hemihydrates or called as monohydrate.. The Invention clarifies a well defined reactivity power concept which was not defined by the existing scientific basis. As a result, cements which have much higher early strengths than the known could be produced.
Abstract:
The present invention provides a gypsum composition, a gypsum board and their preparation method and the use of DHA as an anti-sagging additive in a gypsum product. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises gypsum, and an anti-deformation additive, wherein the anti-deformation additive comprises at least one selected from a group consisting of dehydroascorbic acid, dehydroascorbate and semidehydroascorbic acid. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum product of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum product to meet the demands of the customer.
Abstract:
The invention comprises a method of making a cement-based object or structure having a compressive strength greater than about 1,000 psi. The method comprises placing a cement-based material in an insulated concrete form, wherein the insulated concrete form has an R- value of at least 1.5, wherein the cement-based material comprises approximately 10% to approximately 80% by weight portland cement, and at least one of approximately 10% to approximately 90% by weight slag cement and approximately 5% to approximately 80% by weight fly ash. The invention also comprises a method of making a cement-based object or structure. The invention further comprises objects or structures made by the foregoing methods.
Abstract:
A unreacted dry cement composition or a cement composition comprising greater than 20wt% and less than 65wt% portland cement or clinker, granulated blast furnace slag optionally in combination with steel slag wherein the ratio of slag to cement or clinker is in the range of 1 :2 to 4:1, 1.5 - 6 wt% activator consisting of a sulphate of an alkali metal selected from the group of sodium (Na) and potassium (K) and optionally up to 10 wt% gypsum. A concrete composition comprising the cement composition, aggregate, water, and optional chemical admixtures is also claimed.
Abstract:
An improved gypsum slurry that includes water, calcium sulfate hemihydrate, a naphthalene sulfonate dispersant and a modifier. The modifier is chemically configured to improve the efficacy of the naphthalene sulfonate dispersant. Preferred modifiers include cement, lime, slaked lime, soda ash, carbonates, silicates and phosphates.