CONCENTRATING APPARATUS OF SULFURIC ACID ACIDIC SOLUTION, CONCENTRATING METHOD OF SULFURIC ACID ACIDIC SOLUTION, AND RECOVERY METHOD OF CRUDE NICKEL SULFATE

摘要

PROBLEM TO BE SOLVED: To provide a concentrating apparatus of a sulfuric acid acidic solution that suppresses damage of a heater caused by concentrating the sulfuric acid acidic solution.SOLUTION: A concentrating apparatus of a sulfuric acid acidic solution containing at least calcium is equipped with a first concentrator (10) for concentrating the sulfuric acid acidic solution, a heat exchanger (30) for heating the sulfuric acid acidic solution concentrated in the first concentrator (10) to a temperature lower than the boiling point, and a second concentrator (20) for vacuuming the heated sulfuric acid acidic solution to evaporate water and concentrate. Evaporation of the sulfuric acid acidic solution in the heat exchanger (30) is suppressed by heating the sulfuric acid acidic solution at the temperature lower than the boiling point and thus damage of the heater (30) is suppressed.SELECTED DRAWING: Figure 3