Patent ID: 9102996
Filing Date: 2015-08-11
Classification: B82Y,C01G,C01P,C22B,Y10T

Abstract:
1. A process for oxidising Sn 2+ dissolved in an aqueous solution to stannic compounds using NO 2 − and O 2 as oxidants, said dissolved Sn 2+ being Sn 2+ (X n− ) 2/n , wherein X n− denotes a counter anion and n is 1 or 2 wherein during said oxidation said aqueous solution is kept at a pH in the range of 0 to 7, and said Sn 2+ (X n− ) 2/n and said oxidants are used according to the reaction scheme a Sn 2+ (X n− ) 2/n +b O 2 +c NO 2 − →stannic compounds in which scheme a, b and c are mole numbers; wherein c is 0.05 to 0.5 times of a, and b is greater than zero.