Rare Metal

Previous Next Coltan Ore Process Coltan is short for columbite-tantalite, a dull metallic ore. Approximately 80% of the world’s supply of Coltan is found in the Democratic Republic of Congo. Before coltan is mined by hand in the Congo. The beneficiation process of tantalum niobium ore usually needs to go through 4 stages: crushing, grinding, classification and […]