| 摘要 |
<p>A method for cleansing metal-containing solutions, particularly, but not exclusively, process water which contains such metals as mercury, cadmium and/or lead, where the metals concerned are present in water-soluble form, such as the form of a chloride complex. The method is characterized by passing the solution through an ion-exchange material (4) which consists essentially of sulfhydrated cellulose, the metals being adsorbed in the sulfhydrated cellulose; regenerating the ion-exchange material (4) subsequent to the adsorption of a predetermined quantity of metal, by rinsing the ion-exchange material with an aqueous solution that contains hydrochloric acid (HCl) at a concentration of at least about 1 mole HCl; and precipitating the metals concerned in sulphide form, in a known manner, from the liquid that is eluted from the ion-exchange material (4) in the aforementioned rinsing process. The invention also relates to apparatus for carrying out the method.</p> |
