Separation Of Lead And Antimony In Crispy Sulfur And Lead - Antimony Ore By Vacuum Metallurgy

Jamesonite is one of the important resource of antimony ore in China. In this research, the properties and smelting process of jamesonite are summarized broadly. According to the problems in present smelting process, such as the difficult of separation between Pb and Sb, the complexity of process, environment pollution, etc., vacuum metallurgy method, which is considered as a green metallurgy technology, is proposed to deal with jamesonite in this research. The sulfide of Pb, Sb and Fe could be obtained by vacuum distillation and multistage condensation processes. Finally, Pb, Sb and Fe containing in jamesonite could be separated greatly.Firstly, the feasibility about the separation between Sb2S3, PbS and FeS by vacuum metallurgy method have been analysed in detail. According to the decomposition experiments, it has been known that jamesonite is decomposed completely under the pressure of 20Pa and temperature of 773K. The final products are PbS, Sb2S3 and FeS. The saturated vapor pressure of PbS, Sb2S3 and FeS are greatly different from each other, so that they could be separated by vacuum metallurgy method. According to the vacuum volatilization experiments of pure PbS. Sb2S3 and FeS by rising temperature continuously, it has been seen that none of these three sulfides is decomposed in the process of vacuum hearting volatilization. Results also show that Sb2S3 starts to volatilize at 20Pa and 750K and volatilize completely at 900K. PbS starts to volatilize at 20Pa and 900K and volatilize completely at 1150K. Little of FeS volatilizes in vacuum condition.The experiments about vacuum distillation and multistage condensation of jamesonite are developed emphatically. The effects of distillation temperature and distillation time on the volatilization and decomposition of Pb, Sb and Fe are investigated respectively. Results could also be obtained as follow:if distillation temperature and distillation time are controlled properly at the vacuum condition of 20Pa, the volatilization rate of PbS and Sb2S3 could be reached to 99.80% and 99.85%, respectively. Pb and Sb could be gathered on different condensation plates effectively. The best content of Pb is 82.78%, while the best content of Sb is 68.18%. Little of FeS volatilizes and it reserves in residues. Therefore, the optimum experimental conditions about decomposition between Pb, Sb and Fe by vacuum metallurgy method could be determined as follow:distillation temperature and distillation time are 1473K and 1.0h, respectively.The advantages of vacuum metallurgy are applied greatly in this research. The effective decomposition of Pb, Sb and Fe containing in jamesonite have been realized. Lots of theory directions and experimental evidences are provided for decomposition of jamesonite by vacuum metallurgy method. At the same time, the smelting process of jamesonite could be simplified and the problem of environment pollution could be solved. The green metallurgy of jamesonite could be achieved finally.