Patent ID: 6221128
Filing Date: 2001-04-24
Classification: C22B,Y02P,Y10S

Abstract:
A method for removing mercury from a mercury salt-containing effluent comprising:(a) adding aluminium to the mercury-containing effluent to precipitate elemental mercury therefrom;(b) recovering the mercury precipitate from the effluent leaving a mercury-containing residual effluent, and(c) post-treating the residual effluent by the following steps:(1) rendering the residual effluent alkaline;(2) neutralizing the effluent of step (1) to a pH of about 7 by the addition of an acidic compound thereto;(3) adding a flocculant to the effluent obtained from step (2), and(4) thereafter, filtering the effluent obtained from step (3) through a first filtering medium to remove residual mercury therefrom.