To provide an acid recovery/reuse system wherein a high-quality acid is recovered from drained water which contains hydrochloric acid or the like in a relatively low concentration together with an inorganic salt and is generated in the step of removing a dispersant from a particulate-containing aqueous solution using an inorganic salt as the dispersant by the addition of an acid to dissolve the dispersant, followed by filtration and cleaning, thereby the recovered acid being reused in the step.
The acid recovery/reuse system is characterized in that, in the step of removing a dispersant from a resin-particle-containing aqueous solution containing an inorganic salt as the dispersant by the addition of an acid followed by filtration and cleaning, discharged and dilute acid-cleaned drained water is preliminarily concentrated with a concentration apparatus; and the concentrated acid-cleaned drained water is distilled with a distillation apparatus to recover the acid to reuse it in the step.
NAKAZAWA YOSHIKAZU
UKAI TOSHIYUKI
UENO HITOSHI
Yoshihiro Yamaguchi
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