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Calcium Oxide 90% (Vietnam Origin)

Calcium Oxide 90% (Vietnam Origin)
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Country Origin : Vietnam Appearence : White Lump
CAS No. : 1305-78-8 H.S. Code : 2805.1200.90
Formula : CaO Common Names : Quick Lime, Calcined Lime, QuickLump
IUPAC Name : Calcium Oxide
Packaging : 1000 @ 25 kg PP/PE bags, 25 MT / 20'FCL
  • Description
  • Application
Brief Overview

 

Quick lime or burnt lime, has the chemical name calcium oxide (CaO). The name “lime” refers to inorganic materials containing calcium. Quick lime is white crystalline solid at room temperature which is highly corrosive and alkaline. It is a relative inexpensive compound and together with its chemical derivative calcium hydroxide, they are important chemicals in the commodity industries. Calcium oxide has melting point of 2570°C and a boiling point of 2850°C. It dissolves in water to produce an alkaline solution calcium hydroxide or Ca(OH)2, which is also known as hydrated lime.

 

Manufacturing Process

 

Calcium oxide is usually produced by thermal decomposition of calcium carbonate materials such as limestone in a lime kiln. The limestone is first mined and then crushed and washed to remove impurities. The material is heated during calcination or lime burning, releasing carbon dioxide and leaving behind quick lime: CaCO3 (s) à CaO(s) + CO2(g). Quick lime, being unstable, can react readily with carbon dioxide from air upon cooling as the thermal decomposition of calcium carbonate is reversible, and completely converts back to calcium carbonate when given sufficient time.



Paint Industry

Quick lime is widely used in the manufacture of cement paint. It is also used as a filler. Quick lime is also used to produce Precipitated calcium carbonate (PCC) which is used as a coating and filling agent in paper.



Paper Industry

Calcium oxide is used to regenerate sodium hydroxide from sodium carbonate in the chemical recovery at Kraft pulp mills.

 

Mining and Oil 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.

 

Other Applications

It is used in the construction industry to make cement and mortar for building purposes. It is added in asphalt for building roads to enhance its lifetime and improve cohesion. It is also used to produce other chemicals for other purposes, such as calcium carbide. It is used to manufacture steel and iron from ores, as quick lime combines with the silicates in the ore to form slag that can be removed from the pure molten iron or steel. It is also used to treat water and reduce air pollution. It is heated with silica sand and sodium carbonate to form glass. Moreover, in the paint industry, quick lime is widely used in the manufacture of cement paint.