利用钛白废酸从电热法黄磷电尘中提取镓和磷的研究

Study on the Recovery of Gallium and Phosphorus from Phosphorus Industry Flue Dust with Spent Acid during Titanium White Production

研究了从黄磷电尘浸出镓和磷的过程中反应温度、硫酸浓度、二价铁离子浓度、液固比对镓和磷浸出率的影响以及磷酸根离子浓度、反应温度对镓和二价铁离子沉淀过程的影响。实验结果表明,镓和磷的浸出率随反应温度、硫酸浓度的增加而增加;二价铁离子对镓和磷浸出率的影响不明显;液固比对镓浸出过程影响显著,对磷浸出过程影响不明显;电尘中的磷比镓容易浸出。镓和二价铁离子的沉淀率随磷酸根离子浓度的增加而增加,当磷酸根离子与金属离子摩尔比大于1∶1后,磷酸根离子浓度对沉淀率的影响不再变化;温度对镓离子沉淀过程的影响较小,对二价铁离子的沉淀过程影响较显著。

The effect of reaction temperature, sulfuric acid concentration, ferrous iron concentration and the liquid-tosolid ratio on the leaching rate of gallium and phosphorus during leaching gallium and phosphorus from phosphours industry flue dust and the effect of phosphate ion concentration and reaction temperature on the precipitation process of gallium and ferrous iron were studied. The results showed that the leaching rate of gallium and phosphorus increased with the increasing of the reaction temperature and sulfuric acid concentration. The effect of ferrous iron on the leaching rate of gallium and phosphorus was not significant. The liquid-to-solid ratio had significant effect on the leaching process of gallium while had little significant effect on the leaching process of phosphorus. Phosphorus in the flue dust can be leached easier than gallium. The precipitation rate of gallium and ferrous iron increased with the increasing of phosphate ion concentration. When the molar ratio of phosphate ion and metal ion was above 1： 1, the effect of phosphate ion concentration on the precipitation process did not change any more. The temperature had a little effect on the precipitation process of gallium, but significant effect on that of ferrous iron.