PbO-FeO-CaO-SiO_2-ZnO五元渣系的熔化温度和黏度研究

在铅的富氧熔池熔炼中,高铅渣适宜的熔化温度和黏度对熔炼过程的顺行与高产有着至关重要的作用。以PbO-FeO-CaO-SiO_2-ZnO五元渣系为研究对象,采用灰熔点测定仪测定炉渣熔化温度,采用内圆柱体旋转式快速高温黏度仪测定炉渣黏度,分别探讨了Fe/SiO_2(质量比)(0.9～1.3)、CaO/SiO_2(质量比)(0.4～0.8)及ZnO含量(5%～11%)对炉渣熔化温度和黏度的影响规律。结果表明,随着Fe/SiO_2增加,炉渣的熔化温度和黏度都呈降低趋势,适宜的Fe/SiO_2值为1～1.1;炉渣的熔化温度随CaO的增加有所提高,而黏度随着CaO含量的增加而降低,适宜的CaO/SiO_2值为0.6;炉渣的熔化温度和黏度都随ZnO的增加而升高,在富氧熔池熔炼的操作温度内应保持ZnO含量低于7%。

Study on Melting Temperature and Viscosity of PbO-FeO-CaO-SiO2-ZnO System

Melting temperature and viscosity of slag with high lead content play important role for up-flow and high yield in oxygen-enriched melting bath of lead. Taking PbO-FeO-CaO-SiO2-ZnO system as research object, melting temperature and viscosity of slag were measured by ash melting point measuring instrument and inner cylinder rotary high temperature viscosimeter respectively. Influence of Fe/SiO2 mass ratio (0.9-1.3), CaO/SiO2 mass ratio (0.4-0.8) and ZnO content (5%-11%) on melting temperature and viscosity of slag was investigated. The results show that melting temperature and viscosity of slag drop with increase of Fe/SiO2 ratio, and the appropriate Fe/SiO2 ratio is 1-1.1. Melting temperature of slag rises with increase of CaO content, while viscosity drops with increase of CaO content, and the appropriate CaO/SiO2 ratio is 0.6. Melting temperature and viscosity of slag rise with increase of ZnO content, and ZnO content should be kept to be below 7% in the operating temperature of oxygen-enriched melting process.