Preparation of ultra-pure silver nitrate

Details Preparation of ultra-pure silver nitrate Preparation of ultra-pure silver nitrate

C - Chemistry, Metallurgy

01

G

23/201, 53/232

C01G 5/00 (2006.01)

Patent

CA 1321705

PREPARATION OF ULTRA-PURE SILVER NITRATE ABSTRACT OF THE DISCLOSURE Ultra-pure silver nitrate is prepared from crude silver by a process comprising the steps of dissolving the crude silver in nitric acid to form a crude silver nitrate solution; adding an alkaline agent, such as sodium hydroxide, to the crude silver nitrate solution to precipitate metallic contaminants and form a partially purified silver nitrate solution; adding a selective reducing agent, such as sodium formate, to the partially purified silver nitrate solution, to reduce silver nitrate to metallic silver and thereby precipitate silver powder while leaving metallic contaminants in solution; dissolving the silver powder in nitric acid to form a highly purified silver nitrate solution; and crystallizing ultra-pure silver nitrate from the highly purified silver nitrate solution.

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