To enhance the grinding efficiency of a cement ball mill, it is common practice to add dispersing agents in varying concentrations. These agents include sodium silicate, sodium hydroxide, ammonium hydroxide, trisodium phosphate, sodium carbonate, sodium hexametaphosphate, potassium aluminate, and others. The use of such additives helps reduce particle agglomeration and improves the overall performance of the grinding process.
But why is the water separator an essential component in a cement ball mill? Let's explore this with a practical example. In an experiment involving the grinding of titanium dioxide using a cement ball mill, 1000 kg of titanium dioxide was mixed with 1000 kg of water, and 1500–2250 g of potassium hydroxide was added. This mixture was then processed in the ball mill. After grinding, the slurry was transferred into a drum and diluted with additional water to reach a titanium dioxide concentration of 200 g/L. Then, 2–3 liters of potassium hydroxide solution (750 g/L) were introduced to optimize dispersion.
The resulting slurry showed uneven particle size distribution, highlighting the necessity of combining a cement ball mill with a water separator. Fine particles are difficult to separate from coarse ones, so a hydraulic classifier is used to remove larger particles and return them to the ball mill for further grinding. Commonly used separators include the Dow water separator, centrifugal continuous separator, and hydrocyclone.
The Dow water separator is a cylindrical device equipped with a feeding tube, a rotating crucible, and an overflow tube. As the slurry flows through, finer particles exit via the overflow, while coarser particles settle at the bottom and are returned to the mill. This process runs continuously. It’s important to note that the maximum particle size in the overflow should not exceed 6 µm, and the overflow rate should be maintained around 0.5 cm/min (at 15–25°C). If the temperature increases, the overflow rate can be slightly adjusted. The titanium dioxide concentration in the overflow is typically between 160–170 g/L.
Zhengzhou Hengxing Equipment Co., Ltd. offers high-quality cement ball mill equipment, manufactured with advanced technology and rigorous testing. Their products are designed to meet the highest industry standards. With a wide range of models and competitive pricing, they provide reliable solutions for industrial grinding needs.
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