Intralabs Calcium Carbonate 250g - Very Fine Limestone Flour Powder

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Chemical or power production: Solid sprays or slurries of calcium oxide can be used to remove sulfur dioxide from exhaust streams in a process called flue-gas desulfurization. Fiquet, G.; Richet, P.; Montagnac, G. (Dec 1999). "High-temperature thermal expansion of lime, periclase, corundum and spinel". Physics and Chemistry of Minerals. 27 (2): 103–111. Bibcode: 1999PCM....27..103F. doi: 10.1007/s002690050246. S2CID 93706828 . Retrieved 9 February 2023. Near-surface water of the earth's oceans are oversaturated with CaCO 3 by a factor of more than six. [43] The failure of CaCO 3 to rapidly precipitate out of these waters is likely due to interference by dissolved magnesium ions with nucleation of calcite crystals, the necessary first step in precipitation. Precipitation of aragonite may be suppressed by the presence of naturally occurring organic phosphates in the water. Although ooids likely form through purely inorganic processes, the bulk of CaCO 3 precipitation in the oceans is the result of biological activity. [44] Much of this takes place on carbonate platforms. Limestone is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate ( CaCO 3). Dolomite, CaMg(CO 3) 2, is an uncommon mineral in limestone, and siderite or other carbonate minerals are rare. However, the calcite in limestone often contains a few percent of magnesium. Calcite in limestone is divided into low-magnesium and high-magnesium calcite, with the dividing line placed at a composition of 4% magnesium. High-magnesium calcite retains the calcite mineral structure, which is distinct from dolomite. Aragonite does not usually contain significant magnesium. [8] Most limestone is otherwise chemically fairly pure, with clastic sediments (mainly fine-grained quartz and clay minerals) making up less than 5% [9] to 10% [10] of the composition. Organic matter typically makes up around 0.2% of a limestone and rarely exceeds 1%. [11]

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See also: List of types of limestone Travertine limestone terraces of Pamukkale, Turkey. Cave limestone formations in the Luray Caverns of the northern Shenandoah Valley a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nded.). Boca Raton, FL: CRC Press. p.4.55. ISBN 1-4398-5511-0. The origin of carbonate mud, [30] and the processes by which it is converted to micrite, [45] continue to be a subject of research. Modern carbonate mud is composed mostly of aragonite needles around 5μm (0.20 mils) in length. Needles of this shape and composition are produced by calcareous algae such as Penicillus, making this a plausible source of mud. [46] Another possibility is direct precipitation from the water. A phenomenon known as whitings occurs in shallow waters, in which white streaks containing dispersed micrite appear on the surface of the water. It is uncertain whether this is freshly precipitated aragonite or simply material stirred up from the bottom, but there is some evidence that whitings are caused by biological precipitation of aragonite as part of a bloom of cyanobacteria or microalgae. [47] However, stable isotope ratios in modern carbonate mud appear to be inconsistent with either of these mechanisms, and abrasion of carbonate grains in high-energy environments has been put forward as a third possibility. [30] a b c d e f Tony Oates (2007), "Lime and Limestone", Ullmann's Encyclopedia of Industrial Chemistry (7thed.), Wiley, pp.1–32, doi: 10.1002/14356007.a15_317, ISBN 978-3527306732 A revised classification was proposed by Wright (1992). It adds some diagenetic patterns to the classification scheme. [38] Other descriptive terms

Kumar, Gupta Sudhir; Ramakrishnan, Anushuya; Hung, Yung-Tse (2007), Wang, Lawrence K.; Hung, Yung-Tse; Shammas, Nazih K. (eds.), "Lime Calcination", Advanced Physicochemical Treatment Technologies, Handbook of Environmental Engineering, Totowa, NJ: Humana Press, vol.5, pp.611–633, doi: 10.1007/978-1-59745-173-4_14, ISBN 978-1-58829-860-7 , retrieved 2022-07-26 In 80 BC, the Roman general Sertorius deployed choking clouds of caustic lime powder to defeat the Characitani of Hispania, who had taken refuge in inaccessible caves. [23] A similar dust was used in China to quell an armed peasant revolt in 178 AD, when lime chariots equipped with bellows blew limestone powder into the crowds. [24] Coquina is a poorly consolidated limestone composed of abraded pieces of coral, shells, or other fossil debris. When better consolidated, it is described as coquinite. [40] Chalk is a soft, earthy, fine-textured limestone composed of the tests of planktonic microorganisms such as foraminifera, while

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Adrienne Mayor (2005), "Ancient Warfare and Toxicology", in Philip Wexler (ed.), Encyclopedia of Toxicology, vol.4 (2nded.), Elsevier, pp.117–121, ISBN 0-12-745354-7 P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P330, P332+P313, P362, P363, P403+P233, P405, P501Walker, Thomas A (1888). The Severn Tunnel Its Construction and Difficulties. London: Richard Bentley and Son. p. 92.

Limestone [GCSE Chemistry only] Uses of limestone - BBC

Peloids are structureless grains of microcrystalline carbonate likely produced by a variety of processes. [22] Many are thought to be fecal pellets produced by marine organisms. Others may be produced by endolithic (boring) algae [23] or other microorganisms [24] or through breakdown of mollusc shells. [25] They are difficult to see in a limestone sample except in thin section and are less common in ancient limestones, possibly because compaction of carbonate sediments disrupts them. [23] Plaster: There is archeological evidence that Pre-Pottery Neolithic B humans used limestone-based plaster for flooring and other uses. [15] [16] [17] Such Lime-ash floor remained in use until the late nineteenth century. Limestone is a substitute for lime in many applications, which include agriculture, fluxing, and sulfur removal. Limestone, which contains less reactive material, is slower to react and may have other disadvantages compared with lime, depending on the application; however, limestone is considerably less expensive than lime. Calcined gypsum is an alternative material in industrial plasters and mortars. Cement, cement kiln dust, fly ash, and lime kiln dust are potential substitutes for some construction uses of lime. Magnesium hydroxide is a substitute for lime in pH control, and magnesium oxide is a substitute for dolomitic lime as a flux in steelmaking. [28] Safety [ edit ] Silicification occurs early in diagenesis, at low pH and temperature, and contributes to fossil preservation. [50] Silicification takes place through the reaction: [50] CaCO 3 + H 2 O + CO 2 + H 4 SiO 4 ⟶ SiO 2 + Ca 2 + + 2 HCO 3 − + 2 H 2 O {\displaystyle {\ce {CaCO3 + H2O + CO2 + H4SiO4 -> SiO2 + Ca Limestone forms when calcite or aragonite precipitate out of water containing dissolved calcium, which can take place through both biological and nonbiological processes. [41] The solubility of calcium carbonate ( CaCO 3) is controlled largely by the amount of dissolved carbon dioxide ( CO 2) in the water. This is summarized in the reaction:Ooids (sometimes called ooliths) are sand-sized grains (less than 2mm in diameter) consisting of one or more layers of calcite or aragonite around a central quartz grain or carbonate mineral fragment. These likely form by direct precipitation of calcium carbonate onto the ooid. Pisoliths are similar to ooids, but they are larger than 2 mm in diameter and tend to be more irregular in shape. Limestone composed mostly of ooids is called an oolite or sometimes an oolitic limestone. Ooids form in high-energy environments, such as the Bahama platform, and oolites typically show crossbedding and other features associated with deposition in strong currents. [20] [21] Gretton, Lel. "Lime power for cooking - medieval pots to 21st century cans". Old & Interesting . Retrieved 13 February 2018. a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p.A21. ISBN 978-0-618-94690-7.