| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for improving separability of a metal salt and an acid, and increasing a rate of recovery thereof while realizing stable control in view of the problem that, while conventional separation and recovery of a metal salt and an acid employed a chromatographic separation method by means of an acid retardation method with a prerequisite that, in this method, a fluoride of titanium is eluted first followed by elution of an acid, an application of the acid retardation method has been difficult when a titanium plate is etched with fluoronitric acid because, in this case, not a salt of TiFbut a complex of [TiF]is formed, which is adsorbed by a conventional ion exchange resin.SOLUTION: Provided is a method for recovering an acid and titanium, comprising: recovering an acid by adsorbing a titanium fluoro complex in fluoronitric acid by a strong anion exchange resin; and subsequently flowing water as an eluent whereby, with decrease in acid concentration, the titanium fluoro complex is converted to a fluoro-aquo complex which is eluted from the anion exchange resin. Switching of a valve is performed automatically by measuring an acid concentration by an EC meter.</p> |
