1 1 Sn Sn METHOD FOR PRODUCING STANNOUS OXIDE STANNOUS OXIDE METHOD FOR PRODUCING Sn PLATING SOLUTION AND METHOD FOR REMOVING IMPURITIES FROM SN PLATING SOLUTION

摘要

(S01) for obtaining a Sn ion-containing acid solution, and an alkaline solution selected from ammonium carbonate, ammonium bicarbonate and aqueous ammonia for the Sn ion-containing acid solution to maintain the pH at 3 to 6 (S02) for obtaining a Sn precipitate, a Sn precipitate separating step (S03) for separating the Sn precipitate, a Sn precipitate dispersing step (S04) for dispersing the separated Sn precipitate in a solvent solution, a dispersion K, Pb, Fe, Ni, Cu, and the like in the Sn ion-containing acid solution in the first neutralization step (S02), and a second neutralization step (S06) in which SnO is obtained by adding an alkali solution to the Sn- Zn, Al, Mg, Ca, Cr, Mn, Co, In, and Cd.