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Information @ a Glance

  • Calcium oxide (CaO), commonly known as burnt lime, lime or quicklime, is a widely used chemical compound. It is a white, caustic and alkaline crystalline solid. As a commercial product lime often also contains magnesium oxide, silicon oxide and smaller amounts of Aluminium oxide and iron oxide.
  • Calcium oxide is a crystalline solid. Its crystal structure is Isometric with space group Fm3m. It is generally unstable when 553 moisture is present and exhibits a large exothermic reaction with water to form aqueous Ca(OH)2.

Manufacturing Process

  • Calcium oxide is produced by heating calcium carbonate to 2000 deg F where carbon dioxide disassociates as a gas from the calcium carbonate.
  • Calcium oxide is produced by  burning various forms of calcium carbonate such as limestone, marble, chalk, oyster shells, and dolomite. It may also be produced as a by-product of industrial processes such as cement production.
  • Lime processes mainly contains the following basic steps: Winning of limestone , Limestone storage and preparation , Fuels storage and preparation , Calcination of limestone , Quicklime processing , Quicklime hydration and slaking , Storage, handling and transport.


  • Calcium oxide or calcium hydroxide is used as liming materials for agricultural use, particularly when a rapid change in pH  is desired.
  • Calcium oxide or calcium hydroxide is used as liming materials for agricultural use, particularly when a rapid change in pH 77 is desired.
  • The most important modern use of lime also relies on its ability to form solutions with silicates. Nearly 45% of lime is used in the steel industry. Steel and iron are produced from ores, which are rocks that contain iron oxides. Many of these ores also contain a large amount of silicates


  • More than 90% of the lime (burned or hydrated) produced in the United States is used for basic or industrial chemistry. 70 The primary use is for steel manufacture (30%), metallurgy, air pollution control and water and sewage wastewater 71 treatment (24%), cement and mortar, chemical manufacture, manufacture of glass and paper, diluents and carriers of 72 pesticides such as lime-sulfur and Bordeaux mixture, and bleach production and other chemical manufacture.
  • The demand for various grades and qualities of ground quicklime has grown rapidly ever since the 1950s. Particle size requirements vary from relatively coarse products used for soil stabilisation to very finely divided products for specialist applications
  • The lime industry is a captive industry to Western Australia. Lime producers are competitive through ready access to limestone, cheap energy, economies of scale and in particular by international freight that acts as a barrier to trade in both directions for this low value product. Though import competition serves mainly to determine local prices, it is possible if not probable, that the quality of lime produced in Western Australia will increase with increasing demand from resource companies especially those close to north western ports where import competition is inevitably greatest and with the future supply of higher grade lime from Swan Portland Cement.

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