Reduction smelting of the bismuth oxide residue from pressure leaching of bismuth sulfide was investigated in the FeO-SiO_2-CaO ternary slag system.The results show that all the recovery ratios of Bi,Ag,Cu and Pb incr...Reduction smelting of the bismuth oxide residue from pressure leaching of bismuth sulfide was investigated in the FeO-SiO_2-CaO ternary slag system.The results show that all the recovery ratios of Bi,Ag,Cu and Pb increase with the increase of reductive coal proportion,reaction temperature and time,while too much reductive coal would help Fe enter metal phase;CaO/SiO_2and Fe O/SiO_2 of the chosen slag system should be 0.5-0.75 and 1.25-1.75,respectively,for the reason that the slag system has the optimum mobility and is beneficial for the recovery of metals.The corresponding optimum conditions are determined as follows:the added coal proportion is 7%of the leaching residue,CaO/SiO_2 mass ratio in the chosen slag system is 0.5 and FeO-SiO_2 is 1.5,the reaction temperature is 1300°C and the reaction time is 40 min.Under the above conditions,the recovery ratios of Bi,Ag,Cu and Pb are 99.6%,99.8%,97.0%and 97.3%,respectively.展开更多
The liquid iron containing elements Nb,Mn and Si has been equilibrated with MgO-SiO_2-MnO slag melts at 1600℃ in a Mo wire-wound resistance furnace with a duration of 4h.The oxygen activities in liquid iron were meas...The liquid iron containing elements Nb,Mn and Si has been equilibrated with MgO-SiO_2-MnO slag melts at 1600℃ in a Mo wire-wound resistance furnace with a duration of 4h.The oxygen activities in liquid iron were measured with oxygen sensors.Using the known equilibrium constants of concerning reactions and the oxygen activities in liquid iron,the activities of components in the slag melts can be calculated.It was found that the par- tition ratios of Nb.Mn and Si have a close linear relationship with α_(FeO) in logarithmic scale.The dependence of Nb partition ratio on mole fractions of the slag components was al- so obtained.展开更多
基金Project(134414) supported by the Postdoctoral Funded Program of Central South University,China
文摘Reduction smelting of the bismuth oxide residue from pressure leaching of bismuth sulfide was investigated in the FeO-SiO_2-CaO ternary slag system.The results show that all the recovery ratios of Bi,Ag,Cu and Pb increase with the increase of reductive coal proportion,reaction temperature and time,while too much reductive coal would help Fe enter metal phase;CaO/SiO_2and Fe O/SiO_2 of the chosen slag system should be 0.5-0.75 and 1.25-1.75,respectively,for the reason that the slag system has the optimum mobility and is beneficial for the recovery of metals.The corresponding optimum conditions are determined as follows:the added coal proportion is 7%of the leaching residue,CaO/SiO_2 mass ratio in the chosen slag system is 0.5 and FeO-SiO_2 is 1.5,the reaction temperature is 1300°C and the reaction time is 40 min.Under the above conditions,the recovery ratios of Bi,Ag,Cu and Pb are 99.6%,99.8%,97.0%and 97.3%,respectively.
文摘The liquid iron containing elements Nb,Mn and Si has been equilibrated with MgO-SiO_2-MnO slag melts at 1600℃ in a Mo wire-wound resistance furnace with a duration of 4h.The oxygen activities in liquid iron were measured with oxygen sensors.Using the known equilibrium constants of concerning reactions and the oxygen activities in liquid iron,the activities of components in the slag melts can be calculated.It was found that the par- tition ratios of Nb.Mn and Si have a close linear relationship with α_(FeO) in logarithmic scale.The dependence of Nb partition ratio on mole fractions of the slag components was al- so obtained.
