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Effect of mild torrefaction on pulverization of Norway spruce (Picea abies) by oscillatory ball milling: particle morphology and cellulose crystallinity

Authors
  • Karinkanta, Pasi
  • Illikainen, Mirja
  • Niinimäki, Jouko
Type
Published Article
Journal
Holzforschung
Publisher
De Gruyter
Publication Date
Sep 27, 2013
Volume
68
Issue
3
Pages
337–343
Identifiers
DOI: 10.1515/hf-2013-0090
Source
De Gruyter
Keywords
License
Yellow

Abstract

The effects of mild torrefaction on the pulverization of Norway spruce sawdust have been studied. To this end, sawdust was dried and torrefied below 230°C for different periods of time to obtain samples with mass losses (ML) of 0.2%, 1.4%, and 2.8%, milled in an oscillatory ball mill, and the particle morphology and cellulose crystallinity of the powders were studied. The pretreatment leading to 0.2% ML had no effect on grindability, but that resulting in 1.4% ML improved grindability and a median particle size below 17.4±0.2 μm was attained. Torrefaction involving 2.8% ML reduced the specific energy consumption more than 21% when the targeted median particle size of the torrefied wood was between 18.7±0.5 and 79±3 μm. The mild torrefaction had a negligible influence on the aspect ratio distribution and cellulose crystallinity in the ball-milled wood.

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