calcium sulfate

Calcium sulfate, CaSO₄, is a naturally occurring calcium salt. It is commonly known in its dihydrate form, CaSO₄∙2H₂O, a white or colourless powder called gypsum. As uncalcined gypsum, the sulfate is employed as a soil conditioner. Calcined gypsum is used in making tile, wallboard, lath,…

…effect converts calcium carbonate to calcium sulfate. The volume of the sulfate crystal is almost twice that of the original carbonate of the mural, which causes internal pressure within the pores of wall fabric that can lead to fracturing. Further, the sulfate has a greater capacity to absorb moisture, thus…

…minor amounts of anhydrite (calcium sulfate) and traces of other minerals. Layers of white pure halite are interbedded with layers of black halite and anhydrite. German salt dome cores contain halite, sylvite, and other potash minerals. In Iranian salt domes, halite is mixed with anhydrite and marl (argillaceous limestone)…

…brewed with water rich in calcium sulfate, are made with top-fermenting yeast, and are processed at higher temperatures than the lagers popular in the United States. Pale ale has up to 5 percent alcohol content, while India pale ale—a variety of pale ale—typically has more; both usually have even stronger…

…the world, abundant supplies of calcium sulfate in any of several mineral forms can be used to make the ammonium sulfate by combining it with ammonia and water. This process brings the sulfur in the calcium sulfate deposits into use. Because deposits of calcium sulfate throughout the world are extensive,…

…the burning coal to produce calcium sulfate (CaSO₄). The CaSO₄ can be removed as a solid by-product for use in a variety of applications. In addition, partially spent calcium or magnesium can be regenerated and recycled by a variety of techniques. The formation and emission of nitrogen oxides (NO_x; another…

…paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180 °C (248–356 °F). With an additive to retard the set, it is called wall, or hard wall, plaster, which can provide passive fire protection for interior surfaces.