Lime is a basic industrial chemical of pre-eminent significance. The reaction for conversion of quick lime into hydrated lime is attended by numerous complexities,as during the hydration process of both the calcium and magnesium oxides,a large amounts of heat are generated. The structure and volume of calcium oxide are also changed. The properties of the parent limestone and the conditions of calcination and hydration determine the nature of the hydration product. This can be produced as a dry powder by treating quicklime with a quantity of water sufficient to satisfy its chemical affinity. The process of hydration can be carried out in batches or in a continuous system. Recent trends are aimed at the development of continuous processes which have replaced batch systems because of greater capacity,automation and superior dust control. Various continuous hydrators which are being used for dry hydration of class C and D lime in India and abroad have been detailed in this article for prospective exploitation by the indigenous building lime and process industries.
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