A calciner is a device used to heat materials to high temperatures in the presence of oxygen or air.
This process is commonly used in various applications such as the production of cement, synthesis of zeolites, and devitrification of glass materials.
In the cement production process, the calciner is used to decompose calcium carbonate into calcium oxide and carbon dioxide.
This thermal decomposition helps to produce cement by driving off volatile constituents.
Calcination furnaces can vary in their configuration, but they are typically muffle, reverberatory, or shaft furnaces or kilns.
These furnaces can use electricity, gas, or oil as a fuel source.
The temperature range for calcination is usually between 800°C to 1300°C, depending on the application.
The calcination process is carried out to remove water that is present as absorbed moisture, drive off volatile constituents like carbon dioxide, or oxidize part or the entire substance.
It is often necessary to stir the sample being calcinated to ensure uniformity in the final product.
One type of calcination furnace is the precalciner dry process kiln, which completes the energy-consuming stage of decarbonating the limestone before the feed enters the rotary kiln.
This type of kiln offers advantages such as high kiln output and is commonly used in newer installations.
Rotary kilns, also known as calciners or rotary furnaces, are another type of calcination equipment.
They are used for thermal treatment processes like calcination, sintering, pyrolysis, firing, oxidation, and reduction.
The rotating body of the kiln ensures that the material being processed is mixed and heated homogeneously.
Overall, the function of a calciner is to heat materials to high temperatures in order to induce thermal decomposition, remove volatile fractions, or facilitate phase transitions.
It is an essential component in various industrial processes.
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