Stirred bead mill grinding of gibbsite: Surface and morphological changes

Alex, T C and Kumar, Rakesh and Roy, S K and Mehrotra, S P (2008) Stirred bead mill grinding of gibbsite: Surface and morphological changes. Advanced Powder Technology, 19 (5). pp. 483-491.

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This paper describes the structural and surface changes in gibbsite subjected to mechanical activation using stirred media mill. During milling, the median particle size decreased from 124 to around 3 μm in 30 min indicating high milling efficiency. Scanning electron microscopy studies revealed that gibbsite particles, present in the feed as agglomerates of pseudohexagonal platelets, ruptured by attrition at grain joints followed by fracture leading to further fragmentation. During milling, progressive decrease in the intensity of the (002) peak of gibbsite in the powder X-ray diffraction pattern indicated amorphisation. It was found that the presence of hematite favoured amorphisation of gibbsite. The ζ potential and isoelectric point of gibbsite changed during milling, which indicated alteration of the gibbsite surface.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Gibbsite; stirred milling; mechanical activation; potential; amorphization
Divisions:Metal Extraction and Forming
ID Code:655
Deposited By:Sahu A K
Deposited On:09 Jun 2010 14:26
Last Modified:13 Dec 2011 15:16
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