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Columbite-tantalite (COLTAN) The Engineer posted on October 17, 2006 | COLTAN (Columbite-Tantalite) is a dull metallic ore found in major quantities in the eastern areas of Congo. When refined, COLTAN becomes metallic Tantalum, a heat-resistant powder that can hold a high electrical charge.

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The columbite-tantalite mineral group Figure 1 is the 58 Gravity separation: the selective sorting of ore minerals by exploiting natural variations in mineral Get Price And Support Online COLTAN Gravity Separation and Concentration Methods

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ⓘ Separation Rapids Lithium Project (Separation Lake area) Canadian Mineralogist 36, 609; Tindle, A.G., Breaks, F.W., and Selway, J.B. (2002) Tourmaline in petalite-subtype gramitic pegmatites: evidence of fractionation and contamination from Pakeagama Lake and Separation Lake areas of northwestern Ontario, Canada.

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Separation from tantalum, when necessary, is effected by solvent extraction in a liquid-liquid process; the niobium is then precipitated and roasted to niobium pentoxide, which is reduced to niobium powder through metallothermic and hydriding processes.

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Tantalum, always together with the chemically similar niobium, occurs in the mineral groups tantalite, columbite and coltan (a mix of columbite and tantalite, though not recognised as a …

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