| 摘要 |
<p>Disclosed herein are processes for oxidising Sn2+ dissolved in an aqueous solution to stannic compounds using NO2 and optionally O2 as oxidants, wherein the aqueous solution is kept at a pH in the range of 0 to 7, wherein a salt Sn2+(Xn-)2/n and the oxidants are used according to the reaction scheme a Sn2+(Xn-)2/n + b O2 + c NO2-→ stannic compounds in which scheme a, b and c are mole numbers; with the proviso that when b is essentially zero, then the aqueous solution is essentially free of C1-, HSO4 - and SO42-.</p> |
