![]() But commercial lime frequently contains impurities.Ĭalcium oxide is also widely used in medicines and pesticides. By contrast, quicklime precisely applies to the single chemical compound calcium oxide. The broadly used word lime means calcium-containing inorganic materials, in which oxides and hydroxides of calcium, magnesium, aluminium, silicon, and iron are present. Its other uses are in water softeners, mortars, and cement.Ĭalcium oxide (CaO), is generally known as quicklime or burnt lime, it is a commonly used chemical compound. It is also used for purifying sugar, in preparing bleaching powder, calcium carbide, and calcium cyanamide. This process is done by heating them at temperatures ranging from 1070 degrees Celsius to 1270 degrees celsius.Ĭalcium oxide is used in industries that make porcelain and glass. It starts with decomposing the natural components at high temperatures while maintaining they do not reach the melting point. ![]() This process of obtaining burnt lime is called calcification. limestone) in a distinct lime kiln to about 500☌ to 600☌, decomposing it into the oxide and carbon dioxide. It is prepared by heating calcium carbonate (e.g. The main primary elements which constitute calcium oxide are calcium and oxygen. Calcium oxide also exists in the colours reds and muted browns. On the other hand, it is yellow or brownish in colour in the presence of impurities, such as iron, magnesia, silica or alumina. In its pure form, calcium oxide is white or off grey in colour. Calcium oxide is also called quick lime, caustic lime or burnt lime. It is an amorphous substance that is in a crystalline or powdery solid form. ![]() ![]() He found that when the compound is exposed to air, it combines with carbon dioxide to produce calcium carbonate.Ĭalcium oxide is a chemical compound that has colourless, odourless properties and was used since the early times. The Scottish chemist Joseph Black (1728–1799) performed some of the earliest scientific studies of calcium oxide. By the early fifteenth century, many Europeans were using calcium oxide (generally referred to as lime) in the construction of buildings. The Roman writer Cato the Elder (234 - 149 BC) mentioned one method of making the compound in 184 BC. Calcium oxide has been known since ancient times. ![]()
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