How does the particle size of coltan ore affect the recovery of tantalum (Ta) and niobium (Nb) during the fluorination process?

Label:chem

Topic
The particle size of the ore can significantly influence the efficiency of the fluorination process. Smaller particles offer a larger surface area, which can enhance the contact between the ore and the fluorination agent, potentially leading to higher recovery rates of the metals.
Answer
The recovery of Ta and Nb increases with decreasing particle size of the coltan ore. Finer particles (e.g., -75+45μm) provide a larger surface area, facilitating more efficient chemisorption of fluorine ions and thus higher recovery rates. The study found that the finest particle fraction (-75+45μm) showed the highest recovery rates, with about 80% Ta and 82% Nb recovered under optimal fluorination conditions.
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