Influence Of Combination Of Polycyclic Aromatic Hydrocarbon And Kerosene On Flotation Of Molybdenite

With the decrease of grade of molybdenum ore and the increase of proportion of the refractory ores,i.e.,lwo-grade and fine-disseminated ores,it is difficult to adapt to the changes of the ore by only using kerosene as collector for the mineral processing plant.In the meantime,the components of recycled water are complex,especially the presence of calcium ions,which has a negative effect on the flotation of molybdenite.In view of the above problems,the two kinds of different composite hydrocarbon oil,which were made of kerosene and two kinds of different polycyclic aromatic hydrocarbons A(liquid at room temperature)or B(solid at room temperature)according to a certain proportion of the quality respectively,were proposed to use as collectors of molybdenite.The best ratio and the effect on the flotation of molybdenite of the two kinds of composite hydrocarbon oil had been studied respectively.The aim of this study was to improve the recovery of molybdenite.The actual molybdenum ore flotation test showed that the recovery of molybdenite was increased by using the two kinds of composite hydrocarbon oil collector than that of kerosene.When the mineral processing water is tap water,whether at room temperature or low temperature conditions,the recovery of Mo in the concentrate could be improved 3.0~4.5 percent by using the two kinds of composite hydrocarbon oil were used as collectors.When the mineral processing water was recycled water,no matter which kinds of collector to be used,the index of mineral processing of the molybdenite could be reduced owing to the presence of calcium ions in recycled water.The two kinds of composite hydrocarbon oil had similar effects on improving the recovery of molybdenite,but the composite hydrocarbon oil made of polycyclic aromatic hydrocarbons B(solid at room temperature)and kerosene was easy to crystallization,so it was not conveninent to storage,transportation and concentrate dewatering at low temperature in winter of the northern area.The composite hydrocarbon oil made of polycyclic aromatic hydrocarbons A(liquid at room temperature)and kerosene had high adaptability to the temperature change.Therefore,“95% kerosene +5% polycyclic aromatic hydrocarbons A” was chosen as a good collector for molybdenite.The results of the screening of flotation concentrates for “95% kerosene +5% polycyclic aromatic hydrocarbons A” and kerosene used as collectors respectively showed that the “95% kerosene+5% polycyclic aromatic hydrocarbons A” could obviously improve the recovery of fine molybdenite paticles.Pure mineral flotation test results showed that the floatability of different size of molybdenite particles was different,and the floatability of coarse paticles was better than that of fine paticles.Calcium ions could happen specific adsorption on the edge of molybdenite paticles and form a layer of calcium molybdate film,so reducing the floatability of molybdenite.Kerosene mixed with the polycyclic aromatic hydrocarbons A were used as collector,which would have a certain effect on improving the recovery of fine molybdenite.The zeta potential test showed that the absolute value of potential of fine molybdenite paticles decreased more greater than that of coarse molybdenite paticles,and the polycyclic aromatic hydrocarbons A could well adsorb on the edges of fine molybdenite particles after the different size of molybdenite particles were handled by “95% kerosene+5% polycyclic aromatic hydrocarbons A”.The contact angle data indicated that the kerosene could greatly increase the contact angle of coarse molybdenite paticles,and the polycyclic aromatic hydrocarbons A could improve the contact angle of fine molybdenite paticles.The infrared spectrum test showed that the polycyclic aromatic hydrocarbon A could well adsorb on the fine molybdenite particles.To sum up,95% kerosene and 5% polycyclic aromatic hydrocarbon A was compounded to use as collector for molybdenite flotation,which was not only could effectively improve the processing performance and the recovery of fine molybdenite praticles,but also have better adaptability to recycled water.The conclusion of this study had some guiding significance to the production practice of the similar mineral processing plants.