Twin kilns for the production of industrial lime

Lime is used in many industries, including steel, copper, building construction and road construction, asphalt, cement, brick, glass, agriculture, dam construction, water, sugar, paint, rubber and other industries. The main furnaces in operation in the country are of rotary type, which consume 2 to 3 times more energy per ton of product than two-shaft furnaces. Mapna STS Company has stepped into design and building a two-shaft lime kiln in accordance with Swiss MEARZ technology for the first time in Iran in order to reduce energy consumption and improve the efficiency of this equipment. This machine with a nominal capacity of 150 tons per day offers its products in various granulations and with quality accepted by the steel and mining industries. The charge of limestone is 40-80 mm in size and the total tonnage is 300 tons. This type of furnace consumes natural gas, coke or fuel oil. 100 cubic meters of gas is used to cook each ton of lime, if natural gas is used. Each furnace operating cycle lasts between 10 and 15 minutes. At the end of the cycle, the reversal time (shaft cycle replacement) takes about 70 seconds. After cutting off the gas and air, the inlet valves of the rock and the outlet of the lime are opened and the rock is charged in the shaft where the cooking was done and also the lime is discharged from the outlet valves. The process of this reaction is as follows:


                                                    CaCO3+HEAT → CaO+CO2
The design and construction of a two-shaft lime kiln unit located in Yazd province has been done by Mapna STS.

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