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niobium processing | History, Ores, Mining, Extraction | Britannica
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Coltan - Wikipedia
Coltan is a dull black metallic ore from which the elements niobium and tantalum are extracted. Approximately 71% of the global tantalum supply in 2008 was newly mined, 20% was from recycling, and the remainder was from tin slag Manufacturing · Cement · Motor vehicles · Paper · Refrigerators · Washing machines.
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Mineral Profiles | Niobium-Tantalum
The columbite-tantalite mineral group (Figure 1) is the most common group of Much of the world's niobium supply comes from Bra- zil, where the main quired such as chemical processing equipment (Figure 10) and rust-free fastenings.
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