关键词: 银尾矿, 锡回收, 重选, 浮选

Abstract: In view of the characteristics of tin resources in a foreign silver tailings，such as fine dis‐ seminated particle size，complex mineral composition and high sulfide ore content，an experimental study on the recovery of tin by gravity separation-flotation combined process was carried out. The raw ore contains 0.90% tin，and tin mainly exists in the form of cassiterite，tetrahedrite and tin-rich colloid. The combined process of grinding-desulfurization flotation-low intensity magnetic separation-gravity separation-tin flota‐ tion was adopted. Grinding effectively improved the dissociation of monomer tin mineral，desulfurization flo‐ tation removed sulfide and high intensity magnetic minerals，gravity separation recovered coarse tin miner‐ als，and tin flotation recovered fine tin minerals. The tin concentrate with tin grade of 40.04% and recovery of 33.50% was obtained by gravity separation. Tin concentrate with tin grade of 21.53% and recovery of 24.30% was obtained by flotation. The grade of tin concentrate in the whole process is 29.41%，and the re‐ covery rate is 57.80%，which realizes the efficient recovery of tin resources in refractory silver tailings.

Key words: silver tailings, tin recovery, gravity separation, flotation