CaO/SiO2和Fe/SiO2比对空气中PbO-ZnO-CaO-SiO2-“Fe2O3”系相平衡的影响

摘要

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.%实验测定了CaO/SiO2和Fe/SiO2质量比分别为1～1.6和1.3～1.7、含40％ PbO和8％ZnO的PbO-ZnO-CaO-SiO2-"Fe2O3”渣系的相平衡和液相线温度.将该渣系在1273～1573 K达到平衡,然后快速淬火冷却.XRD和SEM-EDS分析结果表明,该渣的成分位于锌铁尖晶石相的初始成相区,在1273～1473K生成硅酸钙/铅,部分硅酸钙/铅和磁铁铅矿相是通过转熔反应生成的.实验结果和热力学计算结果表明,液相线温度随着渣中CaO/SiO2比的增加和Fe/SiO2比的降低而增加.