Abstract:In order to explore mining technological parameters of a in-situ leachable sandstone-type uranium deposit in Xinjiang and element migration law during leaching, alkaline flask tests with different HCO3- concentration gradients (0.6, 1, 3, 5 and 7 g/L) were carried out in laboratory, and influence of oxidizing agent on leaching was compared. The results show that uranium concentration in alkaline leaching is positively correlated with HCO3- concentration, and leaching effect is obviously better when oxidant is added. When HCO3- concentration is 0.6—1 g/L, uranium leaching effect is poor, but uranium concentration shows a sudden increase when HCO3- concentration rises to 3 g/L. However, when HCO3- concentration continues to rise, uranium concentration rises with a small growth. Considering the benefit, cost and other factors, it is concluded that the optimal concentration of HCO3- is 3g/L and adding oxidant is more beneficial to leaching.