The moisture content of the grinding material has a great impact in the quality of the materials and mill grinding operation.
If more water into the grinding materials, grinding will contain high moisture content, so the fine material will adhere to the grinding body, lining and compartment panel, so that the grinding efficiency will be decreased.
What’s more, too high moisture of grinding material will inevitably make the operating conditions of the mill deteriorate, and make the operation and quality control difficult.
In addition, mixture ratio changes along with the moisture of feed mill materials, thus the grinding quality of the products also will be affected.
Excluding the moisture of material is the essential part in the cement production.
Cement plant uses drying equipments to dry materials independently, and those equipments include rotary dryer, suspension dryer, the flow pattern dryer, boiling dryer, gravity dryer, and so on.
One of the most commonly used is the rotary dryer.
This dryer’s drying efficiency is low with a high investment, but it has a high adaptability of the material.
A variety of materials can be dried by it, and the equipment is simple and reliable, so it gets widely used.
The drying of the material can be natural or artificial. Natural drying is to stack the wet materials in a shed or outdoor sun field to make it dry by sun and wind.
The advantage of this method are no special equipment, no fuel consumption, but slow drying, low yields, high labor strength, serious operating conditions, and the impact of climate are the limitations of this method.
Artificial drying is to stack the material in a specialized dryer.
The artificial drying has many ways to pass heat to the material, such as the use of hot air or hot flue gas, the convective heat transfer; the use of an infrared lamp or hot metal, ceramic, refractory materials and heat transfer.
Heating and drying method using hot air or hot flue gas convection is called convection drying.
The hot air or hot flue gas is known as the drying medium.
In accordance with the characteristics of the cement industry materials, people commonly use convection drying method.
The heat source is easy to obtain, the device is relatively simple, and the total cost is also low.
When drying materials, hot air or hot flue gas heat to the material, so that it evaporates and, at the same time rely on ventilation equipment, drying medium and drying equipment constantly update to exclude water vapor.
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