Vibrating ball mill for pulverizing fine materials

Technical Report · Tue Apr 23 04:00:00 EST 1946

OSTI ID:6749424

Tyler, P M

The mill itself was a cylindrical or semi-cylindrical shell of steel or porcelain partially filled with steel or porcelain grinding balls. The balls' diameters were as small as 12 mm in the smaller mills and as large as 30 mm or more in the bigger mills. The vibration was made by rotation of the unbalanced shaft, combined with the action of the springs at high speed. The small laboratory mill which was the most popular size had 0.3 liter capacity. The largest size required a 16 HP motor when porcelain balls were the grinding medium and a 20 HP motor when steel balls were used. The effect of the peculiar agitating motion characteristics of this mill was to cause the balls to dance up and down in full teeter and to rotate individually and also as a mass, slowly around the shell. The mill could not ordinarily handle feed coarser than 0.5 mm. The real field of the mill was in superfine grinding and it ground most materials down to one micron (0.001 mm) in a single batch operation. There was not any quantitative comparisons between operations of this mill and the others. Two advantages of the method and the shape of ground particles were given in the report. Another report with the title of Fine Grinding of Metal Powders in Vibrating Ball Mills by Dr. Ing. Robert Olbrich was given in appendix A. It consisted of discussions about metal pulverization, aluminum powder, production of aluminum-dust in the vibrating mill the descriptions of three tests; grinding of silver solders, wear of mills and milling bodies, and operational grinding. The purpose of the second report which was given in the appendix was to prove the fact that even brittle and very hard materials, such as metals, could in most cases be successfully pulverized in vibrating mills. Because of heat and explosion problems, with metal grinding, especially aluminum-grinding, a cooling system and an atmosphere of inert gas were necessary. 1 table, 14 images, and 7 diagrams

• Research Organization: Corporate Unverified
• OSTI ID: 6749424
• Report Number(s): TOM-240-928-950
• Country of Publication: United States
• Language: English

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