| 摘要 |
PURPOSE:To perform the quantitatively and qualitatively excellent treatment of a copper waste solution, by forming a slurry by using an alkali neutralizing agent having a good dehydration property and dehydrating said slurry at specific pH while precipitating leaked copper in the dehydration separated solution as metal copper. CONSTITUTION:The copper waste solution from a printed circuit board manufacturing industry is stored in a neutralization tank at first and a neutralizing agent having a good dehydration property such as calcium hydroxide is added to said waste solution under stirring and the pH of the waste solution is held to 6.2-7. The formed slurry is subjected to solid-liquid separation in a dehydrator 3 to obtain a dehydrated sludge cake (b). The dehydration separated solution (a) is sent to a redox tank 4 where an iron powder (d) is thrown into said separated solution while pH is adjusted to 3-4 and redox reaction is performed to precipitate the leaked copper ion as metal copper. By this method, quantitatively and qulitatively excellent treatment is performed without diluting the copper waste solution.
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