Calomel purification process

Details Calomel purification process Calomel purification process

C - Chemistry, Metallurgy

01

G

C01G 13/04 (2006.01)

Patent

CA 2185317

This invention is directed to a novel method for purifying calomel (Hg2Cl2). More particularly, this inven- tion pertains to a novel process for treating impure calomel (Hg2Cl2) to produce a highly purified calomel product that passes American Chemical Society requirements for calomel assay and mercuric chloride contamination. A process for treating impure calomel to produce purified calomel comprising: (a) incorporating impure calomel into an aqueous slurry; (b) oxidizing the aqueous slurry with an oxidizing agent to form soluble mercuric chloride; (c) filtering the aqueous slurry containing soluble mercuric chloride into liquid and solid components; (d) heating the liquid component to greater than 70°C; (e) treating the liquid component with a reducing agent to precipitate purified calomel; and (f) separating the precipitated purified calomel from the filtrate.

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