The apparatus for concentrating sulfuric acid liquid, the recovery method of concentration method and crude nickel sulfate in sulfuric acid solution

摘要

PROBLEM TO BE SOLVED: To provide a concentrator for a sulfuric acid liquid that suppresses damage of a heater by concentrating the sulfuric acid liquid.;SOLUTION: A concentrator of a sulfuric acid liquid containing at least calcium includes: a first concentrator (10) for concentrating the sulfuric acid liquid; a heat exchanger (30) for heating the concentrated sulfuric acid liquid in the first concentrator (10) at a temperature lower than a boiling point; and a second concentrator (20) for decompressing the heated sulfuric acid liquid to evaporate water for concentration. By heating the sulfuric acid liquid at the temperature lower than the boiling point, evaporation of the sulfuric acid liquid in the heat exchanger (30) is suppressed and damage to the heat exchanger (30) can be suppressed.;COPYRIGHT: (C)2014,JPO&INPIT