Hydrated Lime Powder

General process flow diagram for the manufacturing and processing of lime. The first step in the manufacturing of lime is to crush the pieces of limestone to make them smaller. There are two basic types of primary crushers: compression and impact. Compression crushers use slow. steady amounts of pressure to reduce the size of the rock, whereas impact crushers rely on intense, repeated blows. Compression crushers are used mainly for larger stones, impact crushers for smaller sizes. In some plants, stones undergo secondary crushing as well. The crushed stone is screened to provide the desired stone size and then conveyed to storage in conical stockpiles Calcination Limestone is converted into lime through heating in a kiln, a process known as calcination. When limestone is subjected to high temperatures, it undergoes a chemical decomposition resulting in the formation of lime (Cao) and the emission of carbon dioxide gas (CO). High-Calcium Lime CaCO + heat - CO, + Cao Dolomitic Lime Caco, MGO, + heat - 200, + Cao • Mgo To complete the thermal decomposition of limestone into lime, the stone must be heated to the dissociation temperature of the carbonates, and this temperature must be maintained for a certain period of time. The dissociation temperature varies depending on the type of limestone being burned.