Enhanced dissolution of tantalite/columbite following milling

Date

2001

Authors

Welham, N

Journal Title

Journal ISSN

Volume Title

Publisher

Pergamon-Elsevier Ltd

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.

Description

Keywords

Keywords: dissolution; milling; mineral processing; ore Dissolution; Mechanical activation; Milling

Citation

Source

International Journal of Mineral Processing

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

Restricted until

2037-12-31