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Why is the niobium filter cake dried and calcined?
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niobium processing
Four one-millimetre thick samples of niobium metal foil.
In the process of niobium processing, the filter cake is dried and calcined at temperatures between 900 and 1,000 °C (1,650–1,800 °F) specifically to obtain niobium pentoxide. This oxide serves as a critical intermediate product that can subsequently be reduced to produce metallic niobium or ferroniobium.1