Abstract
Effect of grinding factor and scaling up were carried out by grinding using horizontal dry bead mill. For the experiments, 2 sizes of horizontal dry bead mills with different capacities, lab and manufacturing scale, were used to study scaling up and down. The grinding experiments were performed by changing each typical grinding factor for bead mills, including the agitator peripheral speed, bead packing density, bead diameter, and material feeding speed. This set of experiments was conducted for 3 kinds of materials, silica sand of natural inorganic materials, alumina of synthetic inorganic materials, and activated carbon of organic materials. As a result, common for all materials, similar rules were found between the particle size and specific energy, the amount of mechanical energy per unit amount of material. In addition, these rules were applicable for the different-size mills, indicating that the scale can be controlled by the rules and specific energy. Also, it is revealed that when using a single type of material, changing the bead diameter changes the energy efficiency, indicating that using small-diameter bead was effective for efficient grinding.
Highlights
Milling operation had been a well-known unit operation, it often held a prominent position in the industry up until today
We considered full power of the machine during pulverizing as Et [kW], and air power at the same circumferential speed as En [kW], and showed the actual power Ef [kW] in Eq (1), normalized this value using the supply rate of milling material W and considered this as specific energy Sn [kJ/g]
The diagram shows that for pulverization of each milling material, there is a correlation between specific energy and particle size
Summary
Milling operation had been a well-known unit operation, it often held a prominent position in the industry up until today. The industry focuses on time and energy needed for a grinding machine to pulverize a certain amount of milling material, that is, time efficiency and energy efficiency of the machine, and these are significant elements for evaluating the performance of a grinding machine. With the ability to provide high density filling of medium and high energy density milling environment, and the ability to handle a variety of milling operation in principle, bead mill is greatly expected to be used to fulfil today’s industry’s needs which demands various milling operation. Bead mills can provide grinding conditions under a high packing density and high energy density of the media as well as cover a broad range of output (Tanaka, 1994). We have decided to examine and report the performance of horizontal dry bead mill
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