Method for recovering nitric acid and purifying silver...

C - Chemistry – Metallurgy – 01 – B

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C01B 21/42 (2006.01) C01B 21/38 (2006.01) C01B 21/46 (2006.01)

Patent

CA 2691465

A processes for the regeneration of a silver nitrate and nitric acid based electrolyte as used in certain silver refining processes is based on the hydrolytic removal of undesired metal-based compounds such as water insoluble hydrolysable base metal cations and water insoluble hydrolysable base metal nitrates from which the soluble silver nitrate and nitric acid based electrolyte may be separated. Water is added slowly to a dewatered electrolyte melt held at a predetermined, elevated, temperature while allowing nitric acid thereby formed to evolve and be separated from the melt while the water insoluble base metal salts are formed. The melt is then diluted with water to dilute the silver nitrate contained therein and the insoluble base metal salts are separated from the mixture by filtration.

L'invention concerne un procédé de régénération d'un électrolyte à base de nitrate d'argent et d'acide nitrique utilisé dans certains procédés d'affinage de l'argent qui est fondé sur l'élimination hydrolytique de composés à base de métaux non désirés tels que des cations de métaux basiques hydrolysables insolubles dans l'eau et des nitrates de métaux basiques hydrolysables insolubles dans l'eau à partir desquels l'électrolyte à base de nitrate d'argent et d'acide nitrique soluble peut être séparé. On ajoute lentement de l'eau à un électrolyte déshydraté fondu maintenu à une température élevée prédéterminée, en laissant l'acide nitrique ainsi formé se dégager et se séparer du mélange en fusion pendant que se forment des sels de métaux basiques insolubles dans l'eau. Le mélange en fusion est ensuite dilué avec de l'eau afin de diluer le nitrate d'argent qu'il contient et les sels de métaux basiques insolubles sont séparés du mélange par filtration.

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