| 摘要 |
In the Merrill-Crowe process for the removal of noble metals from cyanide leaching solutions by cementation with zinc, the dissolved oxygen has to be removed. According to the invention, oxygen scavengers are used to reduce the oxygen instead of the degassing technique normally applied. Formamidine sulfinic acid and alkali metal sulfites are preferably used as the oxygen scavengers, alkali metal sulfites requiring the presence of an effective quantity of metal ions, preferably 25 to 100 mg Cu ions/l. The process is easy to carry out and improves the economy of the Merrill-Crowe process. |
