In the process of beneficiation , the dewatering of coarse-grained materials is relatively simple. The gravity can be used to naturally drain the water, and most of the moisture is removed. The dewatering of fine-grained materials is more complicated, such as the precision of flotation plants. Mine, the general particle size is relatively fine, its dehydration is usually divided into two steps: the first step of sedimentation and concentration, commonly used sedimentation tank or thickener and other equipment, the very thin pulp is concentrated to a water content of 50% -30% of the pulp , commonly used sedimentation tank or thickener and other equipment, the very thin pulp is concentrated to a moisture content of about 16% -8%. Depending on the specific situation, especially for the concentrate water requirements or in the cold season in the north, sometimes the third step of drying, the material is dried with a dryer, the moisture in the material can be reduced to less than 6%. However, it must be pointed out that the cost of drying and dewatering is high and the loss of concentrate is also large. Therefore, the two-stage dewatering process of concentration and filtration is common in the concentrator.
There are three main methods for dehydration of mineral processing products:
Thermal dehydration
It uses heat to vaporize water to achieve the separation of moisture and solids. This is the case, for example, by drying the material with a rotary kiln dryer.
2. Mechanical dehydration
It uses mechanical force (gravity, pressure, centrifugal force) to separate moisture from solids. For example, precipitation concentration and filtration belong to this type of method. The main application of dewatering in mineral processing is this type of method.
3. Physical and chemical methods for dehydration
It is the application of water-absorbing chemicals such as limestone, anhydrous calcium chloride, etc. to absorb moisture in the material.
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