Abstract: In order to achieve tail-free emission，Chentaigou Iron Mine carried out an optimized ex⁃ perimental study on the beneficiation process. By setting dry separation operation before fine crushing，wet pre-selection operation before one stage ball milling，and pre-selection operation before one stage cyclone sedimentation，+0.5 mm grain size sand was separated in advance for commercial use，and the resulting wet tailings were mixed with cementitious materials for underground filling. Through the above process opti⁃ mization，the mining-filling balance is realized and the efficient and stable operation of the production sys⁃ tem is ensured.

Key words: mining-charge balance, dry separation process, wet pre-separation process before grind? ing, re-grinding and re-separation