Calomel (Hg.sub.2 Cl.sub.2) purification process

Details Calomel (Hg.sub.2 Cl.sub.2) purification process Calomel (Hg.sub.2 Cl.sub.2) purification process

1995-10-31

1997-02-11

Box, Steven

Chemistry of inorganic compounds

Halogen or compound thereof

Binary compound containing metal

423101, C01B 900, C01G 1300

Patent

active

056017952

ABSTRACT:
This invention is directed to a novel method for purifying calomel (Hg.sub.2 Cl.sub.2). More particularly, this invention pertains to a novel process for treating impure calomel (Hg.sub.2 Cl.sub.2) 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.degree. 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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