Lime is one of the oldest chemicals known to man, it was used to plaster the pyramids of Egypt and, in the Roman times, the “Calcis Coctores” (Lime burners), had already studied the primordial lime kilns named “fornax calcaria”. From that time, the chemistry & technology of lime have progressively evolved, although most of the progress has occurred since 1900, with the greatest step forward made since 1955. Today, lime is still an irreplaceable and affordable chemical largely used in modern industry: from metallurgy, to the mining industry, in roads and the building industry, in agriculture, in the chemical industry, for the desulphurization of waste gases, water treatment and in many other sectors. The calcination of limestone is a simple chemical process: However experience and a well proven design are the secrets for a successful lime burning project as several factors influence the choice of lime kiln technology: the raw material quality, the fuel characteristics the specifications of the finished product. The ideal calcination process features: progressive preheating, with a gradual increase in calcination temperature up to the point at which dissociation is complete, finally cooling down the burnt lime, avoiding as much as possible further retention time in order to prevent possible re-carbonation. Cimprogetti Twin Shaft Regenerative kilns represent today the best proven technology for high and medium reactivity lime production in terms of: wider range of feeding limestone fraction, lower fuel consumption, lower maintenance costs, lower emission rates, higher quality lime. To 2 Lime CaCO + Heat = CaO + CO 3 2
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