Enhanced dissolution of tantalite/columbite following milling

N. J. Welham

    Research output: Contribution to journalArticlepeer-review

    60 Citations (Scopus)

    Abstract

    A tantalum/niobium concentrate has been ball-milled for up to 50 h in a laboratory mill without apparent phase change, other than a decrease in unit cell symmetry and some amorphisation. The extent of dissolution in a mixture of hydrochloric acid and sodium fluoride increased with milling time. For a powder milled for 50 h, over 95% of the concentrate were solubilised in 24 h compared with ∼ 50% in 48 h for a 2-h milled powder. The kinetics of dissolution changed with the milling time, indicating a change in the rate-determining step due to milling. These effects were attributed to the decrease in crystallinity of the powder, giving a substantial increase in the lattice strain and in unsatisfied surface bonds where dissolution was thought to occur.

    Original languageEnglish
    Pages (from-to)145-154
    Number of pages10
    JournalInternational Journal of Mineral Processing
    Volume61
    Issue number3
    DOIs
    Publication statusPublished - 2001

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