Cement kilns are used for the pyroprocessing stage of manufacture of Portland and also other varieties of hydraulic cement, in which calcium carbonate reacts with silica-bearing minerals to type a mixture of calcium silicates. Over a billion tonnes of cement are made per year, and cement kilns are the heart of this production process: their capacity usually define the capacity from the cement plant. Because the principal energy-consuming and greenhouse-gas-emitting stage of cement manufacture, improvement of kiln efficiency has been the central concern of cement manufacturing technologies.
cement is normally created from limestone and clay or shale. These raw materials are extracted from the quarry crushed to a really fine powder and after that blended in the right proportions.This blended raw material is called the 'raw feed' or 'kiln feed' and is heated in a rotary kiln where it reaches a temperature of about 1400 C to 1500 C. In its simplest kind, the rotary kiln is usually a tube as much as 200 metres extended and probably 6 metres in diameter, using a lengthy flame at 1 end. The raw feed enters the kiln at the cool end and steadily passes down towards the hot finish, then falls out from the kiln and cools down.
grinding limestone (along with other raw materials to attain the right chemical composition) to about 90% passing 90 microns within a dry circuit.
making cement by the chemical reaction in between the components of your ground mixture. This chemical reaction occurs at high temperature within a rotary kiln.
grinding the cement clinker nodules to 100% passing 90 microns inside a dry circuit.
Grinding occurs in the beginning and the finish with the cement making process. Approximately 1.5 tonnes of raw materials are necessary to produce 1 tonne of finished cement. The electrical energy consumed within the cement making process is in order of 110 kWh/tonne and about 30% of that is used for the raw materials preparation and about 40% for the final cement production by cement clinker grinding. Production fees and environmental issues are emphasizing the need to have to make use of less energy and for that reason the development of much more energy efficient machines for grinding and classification.
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