Interaction effect of various factors and sulfur migration for pyrite recovery by vibrated fluidized bed

摘要

Gangue is a hazardous solid waste with high yield in the world.Due to higher proportion of pyrite in the gangue,pyrite recovery from gangue is significant for environmental protection.As effective recovery methods,dry separation methods have been received amount of attentions in the mineral processing field.In this study,vibrated fluidized bed was attempted to use for pyrite recovery.Vibration energy was introduced to strengthen the density segregation in the fluidized bed.The study also investigated the interaction effect of gas velocity,vibration intensity,and bed height in the vibrated fluidized bed.Moreover,sulfur migration has been studied by several advanced analytical techniques.The results showed that separation efficiency was directly related to the interaction effect among various factors.After the separation,the sulfur content of concentrates were increased to 37.31,35.43,and 28.62% for-6 + 3,-3 + 1,and-1 +0.5 mm size fractions.The sulfur segregation's standard deviation(S_(sulfur)) was beyond 0.70.In addition,elements of S and Fe accounted for higher proportion in the concentrates after the separation.The study indicated that pyrite could be effectively enriched by the vibrated fluidized bed.