| 摘要 |
PURPOSE: A collection method of metal ions of a wasted solution is provided to simplify collection processes and to reduce a reaction chemical and wastes by using an ammonia as a ligand. CONSTITUTION: A compound composed of a nickel and an ammonia is formed by neutralizing a mixed solution having solute Ni and Fe ions in a strong acidity state using ammonia. At this time, the compound in neutralization is more easily solute than the Ni in the strong acidity and the pH is controlled in the range 5 to 9 using a hydrochloric acid or a caustic soda, while it is difficult to make a compound composed of the Fe ion using ammonia as a ligand, especially, the solubility of the Fe ion is considerably decreased in neutralization. In result, the metal ions are easily collected by simple processes of a filtering or a cleansing.
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