Abstract: The full slime cyanidation leaching residue of a gold concentrate powder in Sichuan is with fineness of -29 μm accounting for 80.23%, and the gold grade is 4.02 g/t. The bare and semi-bare con⁃ joined gold accounts for 40.69% of the total gold, and the sulfide inclusion gold accounts for 4.66%. Other gold mainly occurs in quartz and silicate minerals. In order to recover the gold from the secondary resource, beneficiation experiments were carried out. The results showed that the sample was treated by flotation pro⁃ cess, one flotation coarse concentrate was grinded to -29 μm accounting for 87.5% and then selected for four times, and the roughing tailings were scavenged twice in the closed-circuit. Finally, gold concentrate with gold grade of 34.20 g/t and recovery rate of 43.49% was obtained. Combined with the results of gold phase analysis, bare and semi-bare gold and sulfide inclusion gold were fully recovered.

Key words: gold concentrate powder, leaching residue, regrinding for coarse concentrate, flotation