Experimental studies on phase equilibria and liquidus temperature in the PbO-ZnO-CaO-SiO2-＂Fe2O3＂ system,with the mass ratios of CaO/SiO2=1-1.6 and Fe/SiO2= 1.3-1.7,and 40% PbO and 8% ZnO,were carried out between 12...Experimental studies on phase equilibria and liquidus temperature in the PbO-ZnO-CaO-SiO2-＂Fe2O3＂ system,with the mass ratios of CaO/SiO2=1-1.6 and Fe/SiO2= 1.3-1.7,and 40% PbO and 8% ZnO,were carried out between 1273 and 1573 K.Slags were equilibrated at 1273 to 1573 K and cooled rapidly by quenching.The XRD and SEM-EDS results showed that the slag compositions are in the franklinite primary phase field.Calcium and lead silicates are formed between 1373 and 1473 K.The Ca/Pb silicate and magnetoplumbite phases are partially formed by an incongruent reaction.The experimental and thermodynamical results showed that the liquidus increased by increasing CaO/SiO2 mass ratio and decreasing Fe/SiO2 mass ratio.展开更多
An experimental study was carried out to estimate the effect of the lead impurities on the silver distribution in the phases formed in the lead blast furnace. Samples of sinter with different contents of Cu, S, As and...An experimental study was carried out to estimate the effect of the lead impurities on the silver distribution in the phases formed in the lead blast furnace. Samples of sinter with different contents of Cu, S, As and Sb were equilibrated under reducing atmosphere （p（CO）/p（CO2）=2.45） at 1573 K in a tube furnace and slowly cooled. The samples were characterized by scanning electron microscopy and microanalysis （SEM-EDS）. There were five immiscible phases：slag （CaO, FeO and SiO2）, matte （S, Cu and Fe）, speiss （As, Fe and Cu）, Cu-Sb phase and lead bullion （Pb, Ag, Sb, Cu, etc）. The results showed that Cu and Sb promote silver losses during the process since they form a liquid solution with higher silver solubility than liquid bullion. Sulfur and arsenic react with copper to form the matte and speiss phases, respectively. The effect of S and As is to reduce the amount of Cu-Sb alloy and then the silver losses from the bullion.展开更多
文摘Experimental studies on phase equilibria and liquidus temperature in the PbO-ZnO-CaO-SiO2-＂Fe2O3＂ system,with the mass ratios of CaO/SiO2=1-1.6 and Fe/SiO2= 1.3-1.7,and 40% PbO and 8% ZnO,were carried out between 1273 and 1573 K.Slags were equilibrated at 1273 to 1573 K and cooled rapidly by quenching.The XRD and SEM-EDS results showed that the slag compositions are in the franklinite primary phase field.Calcium and lead silicates are formed between 1373 and 1473 K.The Ca/Pb silicate and magnetoplumbite phases are partially formed by an incongruent reaction.The experimental and thermodynamical results showed that the liquidus increased by increasing CaO/SiO2 mass ratio and decreasing Fe/SiO2 mass ratio.
基金Servicios Administrativos Peoles S.A. de C.V. for providing financial support for this project
文摘An experimental study was carried out to estimate the effect of the lead impurities on the silver distribution in the phases formed in the lead blast furnace. Samples of sinter with different contents of Cu, S, As and Sb were equilibrated under reducing atmosphere （p（CO）/p（CO2）=2.45） at 1573 K in a tube furnace and slowly cooled. The samples were characterized by scanning electron microscopy and microanalysis （SEM-EDS）. There were five immiscible phases：slag （CaO, FeO and SiO2）, matte （S, Cu and Fe）, speiss （As, Fe and Cu）, Cu-Sb phase and lead bullion （Pb, Ag, Sb, Cu, etc）. The results showed that Cu and Sb promote silver losses during the process since they form a liquid solution with higher silver solubility than liquid bullion. Sulfur and arsenic react with copper to form the matte and speiss phases, respectively. The effect of S and As is to reduce the amount of Cu-Sb alloy and then the silver losses from the bullion.
