A SOLUBILITY STUDY OF ELECTRO ̶ GENERATED CHLORINE IN DIFFERENT AQUEOUS MEDIA
Pankaj Kumar Choubeya,b, and Min-seuk Kima,b*, Jae-chun Leea,b, Kyeong-woo Chungb, Shun-myung Shinb
a
Resources Recycling, Korea University of Science and Technology, Daejeon 305-350, Korea
b
Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resource (KIGAM), Daejeon
305-350, Korea
(* Corresponding author: Min-seuk Kim)
ABSTRACT
In leaching process, using electro-generated chlorine as an oxidant requires understanding of the solubility
behavior of gaseous chlorine in aqueous solution. The solubility of electro-generated chlorine was investigated in
de-ionized water, HCl, H2SO4, and NaCl solutions. It was found that solubility of chlorine depends on the chlorine
supplying rate, solution temperature and concentration. When chlorine supplying rate 0.93 mM/min the
concentration of dissolved chlorine were 0.086, 0.08, 0.075 and 0.078 mol/L in 1 mol/L HCl, de-ionized water, 1.0
mol/L H2SO4 and 0.5 mol/L NaCl, respectively, and solutions attained the saturation limit in 120 min. Solubility of
chlorine steadily decreases from 0.078 mol/L to 0.072 mol/L with increase in NaCl concentration from 0.5 mol/L to
2 mol/L at 298 K; however, solubility of chlorine increases from 0.0805 mol/L to 0.0875 mol/L with increase in HCl
concentration from 0.5 mol/L to 2 mol/L. Increasing the solution temperature from 298 K to 363 K adversely affect
on solubility of chlorine, which decreases chlorine solubility from 0.072 mol/L to 0.014 mol/L in 2 mol/L NaCl
solution.
KEYWORDS
Electro ̶ generated chlorine, Solubility, NaCl, H2O, H2SO4, H2O