| 摘要 |
<p>PURPOSE:To reduce salt water refining cost through an effective utilization of salt water fed by concentrating brackish water with less energy consumption in such a manner that a part of the brackish water withdrawn from the anode chamber is returned to the chamber after concentration. CONSTITUTION:Brackish water withdrawn from an anode liquid circulation tank 4 undergoes dechlorination with a dechlorination column 6. Then, Na2SO3 and NaOH are added thereto from lines 25 and 26 for controlling pH after the residual chlorine is removed as required. A part of the brackish water is blown down from a line 27 as required to prevent accumulation of Na2SO4 or the like. The concentrated salt water down to a low temperature through a flash evaporation with flash evaporators 7 and 8 is heated with the steam generated from the evaporator 7 condensed by a condensor 9 and then, returned to a tank 4. If necessary, it is returned to the tank via a chelate resin column 11 after removal of multivalent metal ion. The steam generated from the evaporator 8 is condensed away with a balometric condenser 10.</p> |
