Rare-earth-oxide recovery

The rare-earth oxides, which are indispensable for the manufacture of electric components, are extracted or reclaimed from the waste materials of another industrial processes.

Despite their name, the 15 rare-earth metals occur more commonly within the Earth’s crust than precious metals such as gold and platinum but their oxides are rarely found in sufficient concentrations to allow for commercial mining and purification.

They are, however, found relatively frequently alongside titanium dioxide - a versatile mineral that is used in everything from cosmetics and medicines to electronics and the aerospace industries - which Leeds University’s Prof Animesh Jha has been researching for the last eight years.

The Leeds breakthrough came as Jha and his team were fine tuning a patented industrial process they have developed to extract higher yields of titanium dioxide and refine it to over 99 per cent purity.

Not only does the technology eliminate hazardous wastes and cut costs and carbon-dioxide emissions, the team also discovered they can extract significant quantities of rare-earth metal oxides as co-products of the refining process.