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tantalum has been for the construction of acid-proof equipment for the chemical of columbite-tantalite ore concentrates and results of an investigation of a
23 Jun 1986 Graph showing world mine production of niobium concentrate, for selected years the Pacific rim-supplies of niobium and tantalum are.
Coltan is a dull black metallic ore from which the elements niobium and tantalum are extracted. Atlas Iron began mining iron ore there in 2010 and ceased operations there in April 2017. Global Massachusetts Institute of Technology. p. 6.
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Niobium processing, preparation of niobium ore for use in various products. also, columbite concentrates are obtained as by-products of tin mining in Nigeria. alloys are indispensable for the appliion of superconductivity in machinery,
13 Oct 2017 Camborne School of Mines, College of Engineering, Mathematics Physical columbite-group mineral, along with minor Ta present as microlite and as components such as capacitors and equipment used for surgery.
6 Jan 2006 Columbite-tantalite — coltan for short — is a dull metallic ore found in major quantities in the Coltan mining is very well paid in Congo terms.
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24 Sep 2020 Coltan ore itself is a vessel for technology minerals tantalum and niobium. Coltan , or columbite tantalite, is an ore from which niobium and
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