The original lime production process consists of layering limestone and fuel (wood) and firing it for one week. Modern production is carried out using mechanized, semi-mechanized vertical kiln and rotary kiln and boiling furnace equipment. The calcination time is also shortened accordingly. It takes only 2 to 4 hours to produce lime in a rotary kiln, which can increase production efficiency by more than 5 times compared with the production of vertical kiln. In recent years, there have been significant processes and equipment for energy-saving effects such as cross-flow, double-slope and oil-burning ring kiln and short rotary kiln with preheater. The fuel has also been expanded to coal, coke, heavy oil or liquefied gas.
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