Process for removing mercury from brine which contains chlorine residual of a cell of mercury.

摘要

A process for recovering mercury from waste brine from mercury cells comprising adding sulphide or hydrosulphide ions to the brine to precipitate mercury sulphide, trapping the mercury sulphide on a mixed media filter in which the average size of particles in successive super-imposed layers decreases and the specific gravity of the particles increases from the top of the filter downwards, removing the mercury sulphide from the filter by backwashing with an aqueous liquor, separating the mercury sulphide from the backwash liquor and treating the sulphide to produce metallic mercury.