Abstract: The shaker middlings produced from a silver-tin polymetallic mine in Inner Mongolia contain multiple valuable
elements and have a complex mineral composition. The sample assays 9. 8 g/ t Ag,0. 06% Cu,0. 41% Zn,and 1. 41% S,among
which 75. 60% of the silver is hosted in silver-copper minerals. Based on the ore characteristics,a flotation flowsheet of “isoflotation
of Ag-Cu-S,separation of Ag-Cu from S,bulk flotation of Zn-S and separation of Zn from S” was adopted for the beneficiation
tests. Sodium carbonate + zinc sulfate was used as the zinc depressant,lime as the sulfur depressant,ammonium dibutyl
dithiophosphate (ADDP) + SAC as the collector for silver-copper minerals,and ethyl xanthate as the collector for the Zn-S
separation stage. The full-flowsheet test yielded the following results:a silver-copper concentrate with an Ag grade of 3 287. 9
g/ t and Ag recovery of 70. 61%,and a Cu grade of 16. 34% and Cu recovery of 60. 40%;A zinc concentrate with a Zn grade of
41. 09% and Zn recovery of 60. 99%;And a sulfur concentrate with an S grade of 38. 84% and S recovery of 65. 30%. This
flowsheet achieves efficient recovery of valuable elements from the shaker middlings.