Calcium carbonates

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• CALCIUM — Le calcium, élément chimique de symbole Ca et de numéro atomique 20, est le plus léger des métaux alcalinoterreux vrais. Il représente environ 3,45 p. 100 du poids de la croûte terrestre et se classe, par ordre d’abondance, au troisième rang des… …   Encyclopédie Universelle

• CARBONATES NATURELS — Les carbonates sont des minéraux largement représentés à la surface du globe. Le carbonate de calcium, en particulier, est le constituant principal des coquilles de nombreux organismes. On le retrouve surtout dans la lithosphère sous forme de… …   Encyclopédie Universelle

• Calcium carbonate — Calcium carbonate …   Wikipedia

• Calcium aluminate cements — [P. C. Hewlett (Ed) Lea s Chemistry of Cement and Concrete: 4th Ed , Arnold, 1998, ISBN 0 340 56589 6, Chapter 13] are cements consisting predominantly of hydraulic calcium aluminates. Alternative names are aluminous cement , high alumina cement… …   Wikipedia

• Carbonates — Carbonate Pour les articles homonymes, voir Carbonate (homonymie). Structure d un ion carbonate Le carbonate est, en chimie, un …   Wikipédia en Français

• Carbonates on Mars — Evidence for carbonates on Mars has remained elusive. For example, in spite of remote sensing instruments such as OMEGA and THEMIS that are sensitive to infrared emissivity spectral features of carbonates, carbonate outcrops have not been… …   Wikipedia

• Calcium hydroxide — Chembox new Name = Calcium hydroxide ImageFile = Calcium hydroxide.jpg ImageSize = 200px ImageName = Calcium hydroxide IUPACName = Calcium hydroxide OtherNames = Cal, calcium(II) hydroxide, hydrated lime, milk of lime, pickling lime, slaked lime… …   Wikipedia

• E170 — Calcium carbonates (Miscellaneous » Food) …   Abbreviations dictionary

• Petrocalcic Horizon — A petrocalcic horizon is a diagnostic horizon in USDA soil taxonomy. They are formed when secondary Calcium Carbonate or other carbonates accumulate in the subsoil to the extent that the soil becomes cemented into a hardpan. Petrocalcic horizons… …   Wikipedia

• art conservation and restoration — Maintenance and preservation of works of art, their protection from future damage, deterioration, or neglect, and the repair or renovation of works that have deteriorated or been damaged. Research in art history has relied heavily on 20th and… …   Universalium

• Magnetic water treatment — General Arrangement of MWT Apparatus Magnetic Water treatment[1] usually by the application of a changing Magnetic flux is a proposed method of water softening[2] …   Wikipedia