Abstract:The flotation of tailings from selenium tailings has high lead content and lead is toxic metal. If treated directly as waste residue, it will not only pollute the environment, but also be a waste of resources. In this study, the leaching experiment was carried out by the method of hydrometallurgy for the flotation of tailings from the deselenium slag of a certain enterprise in Yunnan, so that the lead in the ore was reasonably recovered and utilized. In this paper, the effects of adding different concentrations of NaOH in the pulp and changing the temperature of the experiment, the ratio of solid to liquid and the reaction time on the effect of lead leaching are studied. At the same time, the influence of autoclave assisted and C reduction pretreatment on lead leaching was explored. The experimental results show that the lead leaching rate of the ore after C reduction is obviously improved. The best condition of carbon reduction pretreatment is 550 C, 6h and 5:100. The optimum conditions of leaching experiment are as follows: leaching temperature is 90 C, solid-liquid ratio is 1:10, NaOH concentration is 180 g/L, reaction time is 1 h. Under this condition, the leaching efficiency of mineral material is the best and the highest leaching rate is 95.8%.