powder grinding mill junction

contract manufacturing | toll processing services | hosokawa micron powder systems

contract manufacturing | toll processing services | hosokawa micron powder systems

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grinding & milling | powder process-solutions

grinding & milling | powder process-solutions

Powder processing often involves bulk powders, additives, or ingredients being milled for particle size reduction. A mill or grinder uses a mechanical action to break the material and reduce it to the required size. This may encompass a whole range of requirements from de-agglomeration and coarse grinding through to fine grinding and classifying.

Many important performance and design elements must go into the selection and integration of a grinding or milling system. Trust PPS to consider all your system parameters to integrate the proper grinder or mill for optimal particle size reduction.

Powder handling is more than just putting components together. At PPS, we design custom, sanitary solutions for your valuable powder. Fill out your information to the right and we will contact you within one business day to discuss your powder processing needs.

silicon powder properties produced in a planetary ball mill as a function of grinding time, grinding bead size and rotational speed | springerlink

silicon powder properties produced in a planetary ball mill as a function of grinding time, grinding bead size and rotational speed | springerlink

Mechanical milling is a promising route for production of submicron and nano sized silicon powders, but it is challenging to predict and control the product properties. In this study a metallurgical grade silicon quality was milled in a planetary ball mill and the properties of the powder were investigated as a function of grinding time, grinding bead size (20mm, 2mm, 0.25mm) and rotational speed based on the concepts presented in the stress model. The finest powder was characterized by a d50 of 0.62m. This powder was produced with the 2mm grinding beads and 4h of grinding (i.e. the highest specific energy input to the mill with this bead size). The largest BET specific surface area, the highest concentration of iron contamination and the smallest amount of crystalline silicon phase were characterized in the powder produced using the 0.25mm grinding beads and 4h of grinding (i.e. the highest stress number). Aggregates consisting of silicon and iron were formed. An acid wash to reduce the concentration of iron contaminant revealed that silicon did form an amorphous phase as well as the specific surface area increased. With a constant specific energy input to the mill, a reduction in rotational speed (i.e. reduced stress energy) produced similar powder properties with the exception of the particle size distribution.

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This work has been financially supported by Elkem ASA and the Norwegian Research Council through the Industrial Ph.D. Scheme (project number: 264144). Authors are very grateful to people in Elkem ASA for their feedback and enlightening discussions, and especially to Astrid Storesund (Elkem ASA, Technology) for conducting the ICP-OES analysis.

Nilssen, B.E., Kleiv, R.A. Silicon Powder Properties Produced in a Planetary Ball Mill as a Function of Grinding Time, Grinding Bead Size and Rotational Speed. Silicon 12, 24132423 (2020). https://doi.org/10.1007/s12633-019-00340-0

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