A direct alkaline leaching process was proposed to extract molybdenum and lead from low-grade wulfenite ore containing 2.87%Mo and 9.39%Pb.The results show that increasing temperature and alkali concentration enhances...A direct alkaline leaching process was proposed to extract molybdenum and lead from low-grade wulfenite ore containing 2.87%Mo and 9.39%Pb.The results show that increasing temperature and alkali concentration enhances the extraction of Mo and Pb,and more than 99.7%of Mo and 64.6%of Pb are extracted under conditions of 75℃,L/S of 2:1,leaching time of 1.0 h,initial NaOH concentration of 80 g/L and stirring speed of 100 r/min.The alkaline leaching of molybdenum follows a chemical reaction control mechanism with activation energy of 46.3 kJ/mol.Lead in the residue is recovered by hydrochloric acid leaching.99.8%of lead is leached under the conditions of 80℃,[MnO2]/[Pb]molar ratio of 1.3:1,sodium chloride concentration of 40 g/L,and hydrochloric acid concentration of 3 mol/L,and a product of crystallized PbCl2 with purity higher than 99.5%is obtained after cooling.展开更多
The in-situ high-pressure structures of wulfenite have been investigated by means of angular dis- persive X-ray diffraction with diamond anvil cell and synchrotron radiation. In the pressure up to 22.9 GPa, a pressure...The in-situ high-pressure structures of wulfenite have been investigated by means of angular dis- persive X-ray diffraction with diamond anvil cell and synchrotron radiation. In the pressure up to 22.9 GPa, a pressure-induced scheelite-to-fergusonite transition is observed at about 10.6 GPa. The pressure dependence for the lattice parameters of wulfenite is reported, and the axial compression coefficients Kao ----- -1.36 × 10^-3 GPa^-1 and Kc0 = -2.78× 10^-3 GPa^-1 are given. The room-temperature isothermal bulk modulus is also obtained by fitting the P-V data using the Murnaghan equation of state.展开更多
基金Project(2012BAB10B06) supported by the National Science and Technology Pillar Program of ChinaProject(51434001) supported by the National Natural Science Foundation of China
文摘A direct alkaline leaching process was proposed to extract molybdenum and lead from low-grade wulfenite ore containing 2.87%Mo and 9.39%Pb.The results show that increasing temperature and alkali concentration enhances the extraction of Mo and Pb,and more than 99.7%of Mo and 64.6%of Pb are extracted under conditions of 75℃,L/S of 2:1,leaching time of 1.0 h,initial NaOH concentration of 80 g/L and stirring speed of 100 r/min.The alkaline leaching of molybdenum follows a chemical reaction control mechanism with activation energy of 46.3 kJ/mol.Lead in the residue is recovered by hydrochloric acid leaching.99.8%of lead is leached under the conditions of 80℃,[MnO2]/[Pb]molar ratio of 1.3:1,sodium chloride concentration of 40 g/L,and hydrochloric acid concentration of 3 mol/L,and a product of crystallized PbCl2 with purity higher than 99.5%is obtained after cooling.
基金Supported by NSFC (40672024)Knowledge Innovation Project of the Chinese Academy of Sciences (KJCX2-SW-N20,KJCX2-SW-N03)
文摘The in-situ high-pressure structures of wulfenite have been investigated by means of angular dis- persive X-ray diffraction with diamond anvil cell and synchrotron radiation. In the pressure up to 22.9 GPa, a pressure-induced scheelite-to-fergusonite transition is observed at about 10.6 GPa. The pressure dependence for the lattice parameters of wulfenite is reported, and the axial compression coefficients Kao ----- -1.36 × 10^-3 GPa^-1 and Kc0 = -2.78× 10^-3 GPa^-1 are given. The room-temperature isothermal bulk modulus is also obtained by fitting the P-V data using the Murnaghan equation of state.
