Abstract: Acidbase potential scale was introduced to overcome the difficulties caused by acidbasic theory in the quantitative research on structure performance of flotation reagents， and to expand the scale of application of acidbasic theory. The selective criterion was presented， which is the function of acidbase potential scale and frontier molecular orbital energy level of flotation reagents. With this selective criterion， the structure performance of RA315 as anion reverse flotation collector of hematite and sulphide mineral collector was studied. The conclusions are in accordance with the flotation test results， which indicates that acidbase potential scale plays a great promotion role in the quantitative research on structureactivity of flotation reagents.

Key words: flotation reagents, soft hard acidbase (SHAB) theory, acidbase potential scale, structure performance, quantum chemistry