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Calcium sulfate, CaSO 4, is a common laboratory and industrial chemical and an often used material in the building trade. It occurs naturally in various forms, which differ in their crystal water content: gypsum (CaSO 4 ·2H 2 O), the hemihydrate (CaSO 4 ·0.5H 2 O) also known as .
Calcination changes the form of calcium sulfate from calcium sulfate dihydrate (CaSO 4·2H 2O) or gypsum to calcium sulfate hemihydrate (CaSO 4·½H 2O), also known as calcined gypsum, plaster of Paris, or stucco. The β-hemihydrate is primarily present in wallboard gypsum.1,2 Heating to temperatures ranging from 109° to 130°C will release
In the production of hydrogen fluoride, calcium fluoride is treated with sulfuric acid, precipitating calcium sulfate. In the refining of zinc, solutions of zinc sulfate are treated with lime to co-precipitate heavy metals such as barium. Calcium sulfate can also be recovered and re-used from scrap drywall at construction sites.
@article{osti_7224692, title = {Decomposition of calcium sulfate: a review of the literature.}, author = {Swift, W. M. and Panek, A. F. and Smith, G. W. and Vogel, G. J. and Jonke, A. A.}, abstractNote = {One of the important issues related to fluidized bed combustion of fossil fuels is the subsequent handling and/or treatment of the partially sulfated lime material removed from the combustor.
Calcium sulphate is rich in natural resources and by-product of many industrial processes. However, most calcium sulphate product was only used with low added value or treated as waste, harmful to environment. If the calcium sulphate can be used as papermaking filler, very high added value can be gained and also the environment problem can be solved.
Calcium sulfate has been used as a biomedical material for over a century thanks to its biocompatible, biodegradable and cementitious properties. However the dense structure and low surface area of existing materials exclude its adsorption properties and restrict the applications. In this work, mesoporous calcium s
Feb 06, 1960· Kelley, Southard and Anderson1 have shown that the thermodynamic properties of calcium sulphate hemihydrate depend on whether the hemihydrate is produced from gypsum calcined in a steam-saturated ...
by the calcination of calcium sulfate dihydrate (dehydration of the initial stable mass) which form of calcium sulfate is stable? hydrated form. gypsum products can also be obtained how? by calcining 'synthetic' or 'chemical' gypsum, a by-product of the manufacture of phosphoric acid.
The dehydration or calcination of raw gypsum to calcium sulfate hemihydrate can be represented by the following formula: CaSO 4.2H 2 O+heat→CaSO 4.½H 2 O+3/2H 2 O . Calcination is the process where calcium sulfate dihydrate is converted to hemi .
Calcium looping (CaL), or the regenerative calcium cycle (RCC), is a second-generation carbon capture technology. It is the most developed form of carbonate looping, where a metal (M) is reversibly reacted between its carbonate form (MCO 3) and its oxide form (MO) to separate carbon dioxide from other gases coming from either power generation or an industrial plant.
calcium (Ca) [kal´se-um] a chemical element, atomic number 20, atomic weight 40.08. (See Appendix 6.) Calcium is the most abundant mineral in the body. In combination with phosphorus it forms calcium phosphate, the dense, hard material of the bones and teeth. It is an important cation in intracellular and extracellular fluid and is essential to the ...
Commercially, calcium sulfate may be used as a retarding agent in Portland cement, size filler, pigment in paint, reducing agent for zinc minerals and as food additive. Packaging 10, 50 g in poly bottle
The ground gypsum leaves the mill and is conveyed to a dust collector. Calcining. Plaster or stucco is made by calcining the raw gypsum to convert the dihydrate into a hemihydrate, and is known as calcined gypsum. In some plants, landplaster is fed to kettle or flash calciners to produce plaster. Calcining occurs at about 250°-300°.
For alpha-hemihydrate the obtained values of microstress are 0.00011...0.00044, for beta-hemihydrate they exceed 0.001. Based on the results of this research, the method of determination of calcium sulfate hemihydrate form by using X-Ray powder diffraction analysis can be .
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 allowing calcined gypsum to be discharged from the kettle through a discharge outlet in the wall of the kettle at the top surface of the calcining gypsum.
Determination of Calcium Sulfate Hemihydrate Modification by X-ray Diffraction Analysis ... to develop a me thod for determination of calcium sulfate ... of gypsum binder produced in calcination ...
Calcining in gypsum kettles is a batch process. Ground gypsum is charged into the top of the kettle when it is at a temperature of 110° C. (230° F.). The temperature is then raised slowly until it reaches about 120° C. (250° F.), at which point the gypsum seems to boil, owing to the steam being emitted from the hydrated calcium sulfate.
This is a highly active material which will readily absorb moisture from the atmospheres. (We don't supply the soluble anhydrite form of calcium sulfate). When calcium sulfate is calcined at temperatures above 400ºC an insoluble anhydrite is formed. It should be noted that this reaction is not reversible.
Gypsum is calcium sulfate dihydrate (CaSO4 2H2O), a white or gray naturally occurring mineral, and is used as a commercial and generic term for all calcium sulfate materials. Raw gypsum ore is processed into a variety of products such as a portland cement additive, soil conditioner, industrial and building plasters, and gypsum wallboard.
Abstract. The influence of the activity of calcium sulfate dihydrate (CaSO 4 ·2H 2 O) on the hydrothermal formation of CaSO 4 ·0.5H 2 O whiskers was investigated in this paper, using commercial CaSO 4 ·2H 2 O as the raw material. The experimental results indicated that the activity of CaSO 4 ·2H 2 O was improved after calcination of the commercial CaSO 4 ·2H 2 O at 150°C for 6.0 h ...
Any tea kettle that has seen good use is bound to develop some mineral buildup, which doesn't sound like the easiest thing to clean out. But it's a lot easier than you might think to get even electric kettles as clean as new. Calcium and lime buildups can be dissolved with .
Patent US4113836 - Continuous gypsum calcination process and ... Sep 12, 1978 ... Continuous calcination of gypsum is provided by uniformly feeding uncalcined gypsum into the calcining batch in a kettle to a location below... More details » Get Price
Gypsum wallboard consists mainly of gypsum i.e. calcium sulfate dihydrate, CaSO 4.2H 2 O. Calcium sulfate in nature is mostly available in two forms: Calcium sulfate dihydrate is commonly referred as gypsum, which is one of the oldest construction materials. It naturally occurs in sedimentary deposits from ancient sea beds.
For alpha-hemihydrate the obtained values of microstress are 0.00011...0.00044, for beta-hemihydrate they exceed 0.001. Based on the results of this research, the method of determination of calcium sulfate hemihydrate form by using X-Ray powder diffraction analysis can be developed. © 2016 The Authors.
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