WASTE ACID REGENERATING METHOD

摘要

A regeneration method of waste acids containing metal salts such as heavy metals, etc., comprises (a) recovering regenerated acids fron an ion exchange resin tower in which the waste acid containing metallic salt flows with the flow velocity of 20-40 ml/min at 20- 40 deg.C, after filling the tower with spherical gel phase of H- type strong acidic cation exchange resin, (b) regenerating resins from the tower maintaining the temperature of a resin- generating agent at 20-40 deg.C and the flow velocity of 20-40 ml/ min, (c) repeating the above two step processes. The waste acid is discharged from acid cleaning process with nitric acid and hydrogen fluoride in the stainless steel annealing.