Through flotation recovery of Silver (Ag) from Zinc acid-leaching residue (ZALR) was investigated in this study. The study adopted the single factor and orthogonal test reveal interactions among all considerable influence factors including sodium sulphide (SS) as regulator, ammonium butyl dithiophosphate (ABD) as major collector, GC as minor collector, interaction between ABD and GC, OC as flotation carrier, and pulp density. The experimental results show the flotation of the circuit composited of one rougher, one cleaner, one scavenger and middlings being back to the next rough flotation together is practical way and that the concentrate containing Ag 10890.0 g/t, recovery 77.43% can be obtained from the residue (Ag grade 340 g/t). The optimum roughing flotation process is: the pH value of flotation pulp is 3.0～4.0, the pulp density is about 45 wt.%, ABD dosage is 900 g/t, GC dosage is 50 g/t, OC dosage is 2000 g/t, and BK201 dosage is 100 g/t.
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