| 摘要 |
<p>A fluoride-containing acid pickling solution which also contains metal salt impurities and free acid is regenerated by a process which includes treating the pickle solution by an acid sorption unit (ASU), neutralizing the resulting metal salt solution to produce a precipitate of metal impurities, which is removed, and then subjecting the salt solution to cation exchange to produce a solution containing hydrofluoric acid. The hydrofluoric acid is returned to the pickle tank, as is the free acid recovered in the ASU.</p> |
