Process for removal of mercury from hydroxyl-ammonium nitrate so

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iib metal

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210753, 210754, 210756, C02F 176

Patent

active

052944174

ABSTRACT:
A process for the removal of mercury from industrial waste streams is disclosed wherein the waste stream is a nitrate based solution that has been decomposed by the addition of hypochlorite. The method involves adding a reducing agent to reduce the hypochlorite and/or adjusting the pH by the use of a strong acid to less than about 2.0, converting any residual chlorine to a soluble unreactive salt, adding a soluble precipitating agent, such as sodium sulfide, to the solution in a ratio to the mercury present of greater than 1:1 to about 2:1 to precipitate out the mercury as a mercury compound. The solution is then filtered to remove the precipitated mercury compound.

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