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Why does filtering slurry before it enters a cement kiln reduce fuel use?
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Cement
The cement-making process, from crushing and grinding of raw materials, through roasting of the ground and mixed ingredients, to final cooling and storing of the finished product.
In the wet process of cement manufacturing, raw materials are mixed with water to create a slurry, which typically contains 35 to 45 percent water.12
Filtering this slurry before it enters the kiln reduces its water content to approximately 20 to 30 percent. Because the kiln must evaporate all added water during the burning process, removing a portion of this moisture beforehand significantly lowers the amount of energy required to heat the material. Consequently, feeding the resulting filter cake into the kiln directly reduces overall fuel consumption.1