| 摘要 |
PURPOSE:To remove calcium and magnesium contents effectively by treating an aq. alkali chloride soln. for electrolysis with sulfurous acid (sulfite) and thereafter bringing said soln. into contact with a chelate resin. CONSTITUTION:(Acidic) alkali sulfite is added to an aq. alkali chloride soln. for electrolysis in the proportion of about 10-100mol times the content of mercury contained in said aq. soln. to convert the mercury into stable complex ions Hg(SO3)2<-->. Next, said aq. soln. is brought into contact with a chelate resin (e.g. ''Diaion CR-10'' manufactured by Mitsubishikasei Co.) (about 5-12pH of aq. soln. and about <=30hr<-1> superficial velocity in a column), and calcium ions and magnesium ions contained in said soln. are adsorbed by the chelate resin and removed. On this occasion, the mercury complex ions are not adsorbed by the resin, therefore the deterioration in resin capacity due to the adsorption of mercury is not caused. |
