Effects of oxidant and particle size on uranium leaching from coal ash

In this paper, uranium leaching efficiency from the coal ash was 45.82% on the condition of 0.3 M H2SO4, 1:20 g/L, 60 A degrees C and 12 h. According to the result of Sequential chemical extraction, leaching trials and X-ray diffraction, oxidants promoted the uranium leaching with the generation of baratovite. There were differences between uranium content of leachable states and leaching trials. Although the uranium content bounding with exchangeable, carbonates and Fe-Mn oxides all peaked at particle size fraction 75-150 mu m, the highest uranium content in leaching trials peaked at size fraction 48-75 mu m.