硼酸钙对铜渣中夹杂铜沉降效果的影响

考察了添加剂CaB2O3对转炉铜渣中夹杂铜沉降效果的影响，并结合铜渣的粘度测试及红外光谱表征，研究其影响机理，采用FactSage软件计算了添加剂对铜渣液相线温度的影响。结果表明，随添加剂含量增大，铜渣中夹杂铜的沉降效果逐渐增强，添加剂含量由0增至6wt%时，底部渣含铜量由4.10wt%增至6.85wt%，这是由于添加剂可有效降低铜渣粘度。随添加剂含量增大，渣粘度降低，但降低效果随温度增大而趋于平缓。随添加剂含量增大，铜渣的硅酸盐结构趋于简化，添加剂通过破坏铜渣复杂的硅酸盐结构降低铜渣粘度。铜渣的液相线温度随添加剂含量增大而减小，添加剂通过减少渣中固体颗粒的方式降低铜渣粘度。

Effect of calcium borate on sedimentation of copper inclusions in copper slag

Taking calcium borate as additive, the effect of additives on the precipitation of copper in copper slag was investigated. Combining the viscosity test of copper slag and the Fourier transform infrared spectroscopy (FT-IR) characterization of copper slag, the mechanism of the influence of calcium borate on copper slag was discussed. At the same time, the influence of additives on the liquids temperature of copper slag was calculated by thermodynamic software FactSage. The results showed that with the increase of additive content, the settlement of copper in copper slag was gradually enhanced. When the content of additives in slag increased from 0 to 6wt%, the copper content of the slag at the bottom of the sample increased from 4.10wt% to 6.85wt%. This is attributed to the fact that additives can effectively reduce the viscosity of copper slag and increase fluidity of slag. The viscosity of copper slag gradually decreased as the additive content increased, but the effect of the additive on the viscosity of the copper slag flat as the temperature increased. The complex silicate structure of copper slag simplified with the increase of additive content in slag, and the additive reduced the viscosity of the copper slag by destroying the complex silicate structure of the copper slag. In addition, the liquidus temperature of copper slag decreased with the increase of additive content. The additive also reduced the viscosity of the copper slag by reducing the amount of solid particles in the slag.