锡阳极泥硫化焙烧分离锑

Separation of antimony from tin anode slime by sulfidation roasting

提出一种硫化焙烧处理锡阳极泥分离锑的新工艺,对硫化焙烧过程进行热力学分析,在热力学分析的基础上,系统考察焙烧温度、焙烧时间、黄铁矿配比及焦粉配比对锑挥发率和锡残留率的影响。结果表明:温度升高有利于Sb2O4和Sn O2硫化反应的进行,且在同一温度下,Sb2O4比Sn O2硫化的趋势更强。在黄铁矿配比为30%(质量分数)、焦粉配比为7%(质量分数)、焙烧温度为1323 K、焙烧时间为2 h的条件下,焙砂中的锑含量为2.96%、锡含量为31.98%、锑的挥发率为85.56%、锡的残留率为88.75%,锡阳极泥硫化焙烧分离锑效果较佳。

A new technology of sulfidation roasting process for tin anode slime to separate antimony was proposed. Thermodynamic analysis of sulfidation roasting process was conducted. Based on the thermodynamic analysis, the influences of calcination temperature, calcination time, pyrite ratio and coke ratio on the volatilization rate of antimony and the residual rate of tin were investigated. The results show that high temperature benefits for Sb2O4 and SnO2 sulfidation reaction,while Sb2O4 sulfidation trend is stronger than that of SnO2 at the same temperature. While the pyrite content is 30% (mass fraction), coke content is 7% (mass fraction), the calcination temperature is 1323 K, the roasting time is 2 h, the antimony content in calcine is 2.96%, tin content is 31.98%, the volatilization rate of antimony is 85.56%, the residual rate of tin is 88.75%, the effect of separating antimony from tin anode slime by sulfidation roasting is better.