METHOD FOR RECOVERING MIXED ACID WITH INCREASED COMPOSITIONAL RATIO OF HYDROFLUORIC ACID FROM WASTE MIXED ACID LIQUID CONTAINING HYDROFLUORIC ACID

摘要

PROBLEM TO BE SOLVED: To provide a method for recovering a mixed acid with increased compositional ratio of hydrofluoric acid from a waste mixed acid liquid containing hydrofluoric acid by a simple distillation operation and at a low cost.;SOLUTION: This method comprises dissolving at least one kind of metal salt selected from the group consisting of cesium nitrate, potassium nitrate and magnesium fluoride in a waste mixed acid liquid containing hydrofluoric acid and other acids, distilling the liquid and recovering the distillate of the mixed acid liquid with increased compositional ratio of hydrofluoric acid.;COPYRIGHT: (C)2008,JPO&INPIT