Method for increasing silver leaching rate of pressure-oxidation-treated oxidized slag of silver-containing difficult-to-treat gold concentrate

The invention discloses a method for increasing the silver leaching rate of the pressure-oxidation-treated oxidized slag of silver-containing difficult-to-treat gold concentrate. The method comprisesthe following steps that: S1, a feed ore sample is pre-acidified, the pre-acidified sample is subjected to thickening treatment, so that overflow liquid and underflow can be obtained, the underflow isregulated into pre-acidified ore pulp, the overflow liquid is acidified, and extraction is performed on the acidified overflow liquid, so that copper can be recovered; S2, pressure-oxidation is performed on the pre-acidified ore pulp, so that oxidized ore pulp can be generated; S3, BFS transformation (basic ferric sulfate decomposition) is carried out on the oxidized ore pulp, and then thickeningtreatment is performed, so that oxidized liquid and oxidized slag can be obtained; and S4, the oxidized liquid is returned to the pre-acidification step in the step S1, and the oxidized slag is subjected to heating alkaline pr