Types of Ball Mills
Ball mill which offered by SBM is a horizontal rotating device transmitted by the outer gear. We adopt the advanced technical of the world and improved by our engineer. When ball mill working, the materials are transferred to the grinding chamber through the quill shaft uniformly. There are ladder liner and ripple liner and different specifications of steel balls in the chamber. The centrifugal force caused by rotation of barrel brings the steel balls to a certain height and impact and grind the materials.
Types of Ball Mills
• There is no fundamental restriction to the type of ball mill used for organic synthesis (planetary ball mill, mixer ball mill, vibration ball mill, …).
• The scale of reaction determines the size and the type of ball mill.
• Vessels for laboratory vibration ball mills are normally restricted to a volume of 50 cm3.
• The material density determines the energy entry and therefore, the choice of material influence the dissipative heat formation during ball milling. The higher the material density, the higher is the energy entry.
• Milling beakers and milling balls should be of the same material. At least, the material density of the milling beaker should be higher than that of the milling balls.
• The applied material should be chemically inert towards the reaction mixture. For most applications in organic synthesis, including catalysis, ceramic materials (e.g. ZrO2) are the best choice. They are chemically inert and the material abrasion is comparably low.
• Some materials posses a high porosity (agate, steel) which could lead to memory effects.
Frequency and reaction time:
• In case of new reaction procedures, compare to related examples which have eventually been published.
• It is rather recommend changing reaction time than frequency.
• Start with 75-100% of the maximal operation frequency of the ball mill.
• The thermal stress for the reactants could be reduced by using cycled mode: mill for a specific amount of time – 5-10 min pause – start milling again and repeat the procedure for the required amount of time.
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