The composition of a collector directly affects its collecting performance in mineral flotation.In this study,three vegetable oils were used as the collectors,the flotation performance of scheelite and the differentia...The composition of a collector directly affects its collecting performance in mineral flotation.In this study,three vegetable oils were used as the collectors,the flotation performance of scheelite and the differential analysis were studied through flotation experiments,zeta potential,contact angle measurement and Fourier transform infrared spectrum(FTIR)analysis.Flotation results show that the recovery of scheelite increases in the order of oleic acid<rapeseed oil<rice bran oil<soybean oil,especially in the pH range of 5-8.The distinction in the scheelite recovery is due to the different compositions of these collectors.The addition of LA,LNA and PA(<5%)can increase the recovery of scheelite with OA,but the addition of SA deteriorates the scheelite flotation.Results of zeta potential,contact angle measurement and FTIR analysis indicate that the collector adsorption on scheelite surface is enhanced when using the three vegetable oils.For the raw ore with 0.086%WO3,a rough concentrate containing 1.423%WO3 with the recovery of 84.22%is obtained using soybean oil as the collector.展开更多
In order to improve the scheelite flotation with sodium oleate(NaOL),the effect of a non-ionic polyoxyethylene ether(JFC-5)on the floatability of scheelite was investigated through flotation experiments at10°C,co...In order to improve the scheelite flotation with sodium oleate(NaOL),the effect of a non-ionic polyoxyethylene ether(JFC-5)on the floatability of scheelite was investigated through flotation experiments at10°C,compared with60mg/L NaOL alone,the recovery of scheelite is improved from22%to85%in the presence of JFC-5with a mass ratio of20%at pH10.Moreover,the resistance to Ca2+of NaOL is increased.The adsorption mechanism was analyzed by zeta potential measurement,contact angle measurement and X-ray photoelectron spectroscopy(XPS)analysis.The results show that the adsorption of NaOL on scheelite surface is enhanced after adding JFC-5due to the more negative zeta potentials and larger contact angles of scheelite.And the co-adsorption of NaOL and JFC-5is confirmed by XPS analysis,so it is indicated that the adsorption of JFC-5decreases the electrostatic repulsion between the oleate ions,resulting in the stronger adsorption of NaOL on scheelite surface.In short,the mixed NaOL/JFC-5collector can effectively improve scheelite flotation.展开更多
基金Project(2016RS2016) supported by Provincial Science and Technology Leader Program,Hunan,ChinaProject(2017zzts807) supported by Postgraduate Innovative Research Projects of Central South University,China
文摘The composition of a collector directly affects its collecting performance in mineral flotation.In this study,three vegetable oils were used as the collectors,the flotation performance of scheelite and the differential analysis were studied through flotation experiments,zeta potential,contact angle measurement and Fourier transform infrared spectrum(FTIR)analysis.Flotation results show that the recovery of scheelite increases in the order of oleic acid<rapeseed oil<rice bran oil<soybean oil,especially in the pH range of 5-8.The distinction in the scheelite recovery is due to the different compositions of these collectors.The addition of LA,LNA and PA(<5%)can increase the recovery of scheelite with OA,but the addition of SA deteriorates the scheelite flotation.Results of zeta potential,contact angle measurement and FTIR analysis indicate that the collector adsorption on scheelite surface is enhanced when using the three vegetable oils.For the raw ore with 0.086%WO3,a rough concentrate containing 1.423%WO3 with the recovery of 84.22%is obtained using soybean oil as the collector.
基金Project(2016RS2016)supported by Hunan Provincial Science and Technology Leader(Innovation Team of Interface Chemistry of Efficient and Clean Utilization of Complex Mineral Resources)China
文摘In order to improve the scheelite flotation with sodium oleate(NaOL),the effect of a non-ionic polyoxyethylene ether(JFC-5)on the floatability of scheelite was investigated through flotation experiments at10°C,compared with60mg/L NaOL alone,the recovery of scheelite is improved from22%to85%in the presence of JFC-5with a mass ratio of20%at pH10.Moreover,the resistance to Ca2+of NaOL is increased.The adsorption mechanism was analyzed by zeta potential measurement,contact angle measurement and X-ray photoelectron spectroscopy(XPS)analysis.The results show that the adsorption of NaOL on scheelite surface is enhanced after adding JFC-5due to the more negative zeta potentials and larger contact angles of scheelite.And the co-adsorption of NaOL and JFC-5is confirmed by XPS analysis,so it is indicated that the adsorption of JFC-5decreases the electrostatic repulsion between the oleate ions,resulting in the stronger adsorption of NaOL on scheelite surface.In short,the mixed NaOL/JFC-5collector can effectively improve scheelite flotation.
