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silver refining process

     

The refining process of silver:

This method, known as the sodium chloride precipitation method, is strictly speaking a technique used to recover silver from spent electrolytic solutions and does not constitute purification. The process involves using sodium chloride to react with silver nitrate and form sodium chloride precipitate, thereby separating silver from other impurities. Afterwards, the silver powder is reduced by reducing agents such as hydroxylamine, iron powder, and zinc powder into refined silver. Finally, the silver powder is reacted with nitric acid to generate nitrate solution for electrolysis. Many refining plants now adopt this method.

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