Patent ID: 9067800
Filing Date: 2015-06-30
Classification: C01G,C01P,C25D

Abstract:
1. A method for manufacturing tin(II) oxide powder for replenishing a tin component of a tin-alloy plating solution comprising steps of: preparing an aqueous acidic solution containing Sn neutralizing the aqueous acidic solution at a liquid temperature of 30 to 50° C. and at a pH range of 6 to 8 in a nitrogen gas atmosphere by adding an aqueous alkaline solution to prepare a slurry of tin(II) hydroxide; dehydrating the prepared slurry in a nitrogen gas atmosphere to prepare a slurry of tin(II) oxide; separating the slurry of tin(II) oxide into a solid and a liquid to obtain tin(II) oxide; treating the obtained tin(II) oxide with an aqueous antioxidant solution having a concentration of 0.1 to 5% by mass; and vacuum drying the tin(II) oxide treated with the aqueous antioxidant solution; wherein