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Quick Lime / Burnt Lime

     SPARKGUYS are manufacturer of Lime, since 2011 in Tirunelveli. We have very good setup and good production capacity to produce Quick Lime which is based on customer requirement. Our range is inclusive of Quick Lime Powder and Quick Lime Lumps. Our Quick Lime has 70% to 95% of CaO. We also offer Calcined Lime, Burnt Lime, Construction Lime, Dehydration Lime, Refinery Powder, Low Sulphur Product, etc.

     Quicklime is made by heating crushed and sorted limestone in either a rotary or shaft kiln. The limestone (CaCO3) breaks down into calcium oxide, i.e. quicklime, (CaO) and carbon dioxide (CO2). This reaction, termed calcination, requires temperatures of approximately 1100 degrees Celsius. In a rotary kiln the heating process lasts about six hours; in a shaft kiln calcination takes about 24-36 hours. When the quicklime comes out of the kiln it is in lumps, grains and powder.

Preparation of quicklime

     Calcium oxide is usually made by the thermal decomposition of materials such as limestone, or seashells, that contain calcium carbonate (CaCO3; mineral calcite) in a lime kiln. This is accomplished by heating the material to above 825 °C (1,517 °F),[6] a process called calcination or lime-burning, to liberate a molecule of carbon dioxide (CO2); leaving quicklime. The quicklime is not stable and, when cooled, will spontaneously react with CO2 from the air until, after enough time, it will be completely converted back to calcium carbonate unless slaked with water to set as lime plaster or lime mortar.

     Annual worldwide production of quicklime is around 283 million metric tons. China is by far the world's largest producer, with a total of around 170 million tonnes per year. The United States is the next largest, with around 20 million tonnes per year.

Usage of quicklime

  • Heat: Quicklime produces heat energy by the formation of the hydrate, calcium hydroxide, by the following equation: CaO (s) + H2O (l) is in equilibrium with Ca(OH)2 (aq) (ΔHr = −63.7 kJ/mol of CaO) As it hydrates, an exothermic reaction results and the solid puffs up. The hydrate can be reconverted to quicklime by removing the water by heating it to redness to reverse the hydration reaction. One litre of water combines with approximately 3.1 kilograms (6.8 lb) of quicklime to give calcium hydroxide plus 3.54 MJ of energy. This process can be used to provide a convenient portable source of heat, as for on-the-spot food warming in a self-heating can.
  • Light: When quicklime is heated to 2,400 °C (4,350 °F), it emits an intense glow. This form of illumination is known as a limelight, and was used broadly in theatrical productions prior to the invention of electric lighting.
  • Cement: Calcium oxide is a key ingredient for the process of making cement.
  • As an alkali in biodiesel production
  • Petroleum industry: Water detection pastes contain a mix of calcium oxide and phenolphthalein. Should this paste come into contact with water in a fuel storage tank, the CaO reacts with the water to form calcium hydroxide. Calcium hydroxide has a high enough pH to turn the phenolphthalein a vivid purplish-pink color, thus indicating the presence of water.
  • Paper: Calcium oxide is used to regenerate sodium hydroxide from sodium carbonate in the chemical recovery at Kraft pulp mills.
  • Plaster: There is archeological evidence that Pre-Pottery Neolithic B humans used limestone-based plaster for flooring and other uses.[12][13][14] Such Lime-ash floor remained in use until the late nineteenth century.
  • 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.