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Tantalum was extracted from the tantalite-columbite ore solution using tributyl phosphate (TBP) as a solvent. TBP containing tantalum and trace impurities were next decomposed applying a microwave digestion and the mixture of HNO3, H2O2 and HF acids. The procedure was conducted in the microwave vessel at low and high temperatures. It was found that under cold conditions NO2 and CO2 liberated during...
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