Abstract: The acid leaching residue of a zinc smelter contained Ag 150-250 g/t. Silver sulfide, elemental silver and other recoverable silver accounted for only 64.01%. The silver mineral size was fine and the occurrence form was complex. The silver in the acid leaching slag was recovered by the process of Segmented activation - flotation, and the content of Zn²⁺ in the pulp was controlled to be less than 30 g/L. Silver concentrate can be obtained by closed - circuit test with Ag grade 4 466.99 g/t and Ag recovery 57.67%, which was greatly improved compared with the grade and recovery of the on-site silver concentrate.