Abstract: In allusion to the comprehensive recovery of low-grade lead in acid residue from cyanidation process of golden leaching,salt leaching method was adopted to extract lead in the experimental study.Influences of the factors,such as liquid and solid (L/S) mass ratio,leaching temperature,leaching time,concentration of NaCl,and leaching pH,on leaching ratio of lead were studied through orthogonal experiment.It was found that when L/S mass ratio was 5,leaching tempeture was 333.15 K,mass fraction of NaCl was 30%,pH=0,and leaching time was 4 h the best average lead leaching rate was 92.05% and relatively standard deviation was 4.3‰.At room temperature,lead leaching rate also reached 90.20% and relatively standard deviation was 4.1‰.So salt leaching method is an effective way of lead recovery and gold and silver yield improvement in comprehensive utilization of mines at room temperature.

Key words: acid residue, NaCl, leaching, lead