Chloride Pyrometallurgy of Uranium Ore, (II)Selective Extraction of Uranium Using the Mixed Gas of Chlorine and Oxygen in the Presence of Activated Carbon

摘要

Selective extraction of uranium from a phosphate are was studied by using the mixed gas of Cl2 and O2. On heating the ore and carbon mixture in Cl2, the volatilized chloride of uranium is accompanied by iron, aluminum, phosphorus and silicon chlorides. The addition of O2 gas effectively lowered the volatilization ratios of aluminum, phosphorus and silicon. The ratio decreased with increasing oxygen flow rate up to 50ml/min at 1, 223K (Cl2:100ml/min, O2+N2: 400ml/min). The volatilization ratio of uranium was almost unchanged at 90% up to 50ml/min O2 (carbon amount: 15wt%). The effect of the other parameters, i.e. Cl2 flow rate, carbon amount, reaction temperature and time was examined.