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Increased dissolution of ilmenite induced by high-energy ball milling

journal contribution
posted on 01.11.1999, 00:00 authored by Ying (Ian) ChenYing (Ian) Chen, J S Williams, S J Campbell, G M Wang
High-energy ball milling treatment leads to full dissolution of natural ilmenite sands containing both FeTiO 3 and Fe 2 Ti 3 O 9 phases in a sulphuric acid solution at 100°C. The ilmenite material has been milled for various times in two environments (vacuum and air), and characterised by X-ray diffraction, Mössbauer spectroscopy and surface area analysis. It is found that after milling for only 10h, 50% of the sample can be dissolved as a result of the increased surface area, nanocrystalline structure and high level of lattice distortion present in the milled sample. Complete dissolution of the ilmenite is obtained on extended milling (200 h) in an oxygen free atmosphere. This occurs as a result of a gradual reduction of the Fe 3+ phase (Fe 2 Ti 3 O 9 ) to the relatively more soluble Fe 2+ phase (FeTiO 3 ) on milling in vacuum. The results overall show that the chemical reactivity of milled materials can be affected significantly by the milling conditions and environment.

History

Journal

Materials science and engineering A

Volume

271

Issue

1-2

Pagination

485 - 490

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0921-5093

eISSN

1873-4936

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1999, Elsevier