Samenvatting
Using the gas—solid interaction number Ng, it is possible to predict the circumstances under which a fine powder will exhibit increased porosity and high mobility. This increased mobility generally favours the handling of powders. The lower the Ng-number the better the mobility and the better the process efficiency.
For the case of milling in a ball mill, this is further analyzed in steps: first, the gas encapsulation and the ball behaviour are considered, both in dependence on the Ng-number. Next, the milling effect of single falling or cascading balls is determined from milling experiments on various ball loads. On the basis of the Ng-number, it is assumed that scaling up has similar effects to increasing the gas viscosity on the mobility of the powder during handling. With this assumption and from the above-mentioned results, the scaling up of ball mills is considered. It follows that scaling up rules at low Ng-numbers (Ng <20) must be different from those at high Ng-numbers as they are reported in the literature.
Originele taal-2 | Engels |
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Pagina's (van-tot) | 147-154 |
Aantal pagina's | 8 |
Tijdschrift | Powder Technology |
Volume | 50 |
Nummer van het tijdschrift | 2 |
DOI's | |
Status | Gepubliceerd - 1987 |