Chromic acid reduction processing method

Abstract

Abstract PURPOSE: To reduce chromic acid economically and effectively, by adding a liquid, where the iron metal is dissolved in the nitric acid liquid of pH within a specific range, to the electrolytic solution of the electrolytic processing means where chromic acid is generated. CONSTITUTION: The electrolytic solution containing chromic acid is taken out through the electrolytic processing from the electrolytic processing machine. The liquid where the iron metal is dissolved in the nitric acid liquid of pH0W2 is added to this electrolytic solution. Otherwise, it may be added after neutralizing the electrolytic solution by caustic soda. Therefore, chromic acid is reduced into unsoluble chromium nitrate or into unsoluble chromium hydroxide due to neutralization. They are filtered and separated from each other and are used again as the electrolytic solution. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Minoru Tanaka

Bibliographic Details