Abstract: This is an essay in the field of mining engineering. Lala Copper Mine is a famous copper-iron polymetallic deposit in Sichuan province. In the past several decades of mine production, a large number of industrial solid wastes have been produced, among which several useful elements such as copper, cobalt and gold are still relatively high in tailings, which has great recovery potential. The tailings of Lala Copper Mine have not gone through systematic beneficiation recovery experiment. Based on the study of Lala copper mine tailings samples, on the basis of process mineralogy study, the process of "copper-sulfur mixed flotation-copper-sulfur separation-iron separation from tailings" was used to recover it, and a copper secondary concentrate with Cu grade of 13.38% and recovery of 21.19% was obtained. Sulfur cobalt concentrate with Co grade of 0.32% and recovery of 17.20%; And iron concentrate with TFe grade of 60.99%. After the recovery of valuable elements, mica and silicate minerals were recovered from the tailings to obtain mica concentrate of better quality, and a mica concentrate with K₂O grade of 8.67% and recovery of 35.26% was obtained. The tailings recovered from mica were used to prepare silicon fertilizer, the available silicon content of silicon fertilizer product was 38.75%, and the silicon fertilizer raw material could be consumed 43.59%.