Abstract: A lead-zinc blast furnace slag was mainly composed of iron oxides and silicate minerals such as periclase, magnetite and clinoptilolite. The content of ZnO was 12. 30%,and the content of PbO was 3. 31%. Lead,zinc,copper and iron have high recovery value. In order to develop and utilize the secondary resource efficiently and environmentally,the process conditions of lead and zinc recovery were studied by high temperature reduction method with coking coal as reductant. The effects of roasting temperature,coking coal dosage and roasting time on the volatilization rate of lead and zinc were investigated,and the chemical reactions occurred in the process were inferred from the experimental phenomena. The volatilization rates of lead and zinc reached 97. 12% and 97. 60%,respectively,when the roasting temperature was 1 200 ℃ ,the mass ratio of coking coal to ore was 30%,and the roasting time was 1. 5 h,meanwhile the arsenic was not volatilized synchronously,so the lead and zinc recovery effect was good. The recovery process conditions of iron and copper in roasting slag will be determined later. It was proposed to use grinding and magnetic separation to recover iron and flotation to recover copper. The residues after a substantial reduction in heavy metal content will be utilized in the production of building materials,so as to achieve the goal of " harmless,reduction and recycling" treatment of lead-zinc blast furnace slag. 

Key words: blast furnace slag,carbon thermal high-temperature reduction,volatilization rate of lead and zinc,comprehensive recycling and utilization