石墨在酸洗过程中加入还原剂将铁离子转化为亚铁离子,降低了溶出所需酸度,促进了溶出量的增加,提高了提纯速率。酸加还原剂的配方较仅用酸时令铁离子更快速地溶出,部分还原剂在1h内可以将处理液中铁浓度提高28.64%。在石墨酸洗过程中添加适当还原剂,不仅是降低石墨中高残留的铁离子是一种有效的方法,更可以缩短提纯时间一半以上。 Graphite in the pickling process by adding a reducing agent to iron ions into ferrous ions, reducing the acidity required for dissolution, and promote the increase in the amount of dissolution and improve the purification rate. The acid and reductant formula makes the iron ions dissolve more rapidly than the acid only, and part of the reductant can increase the iron concentration in the treatment solution by 28.64% within 1 h. Adding appropriate reductant in the process of graphite pickling is not only an effective way to reduce the high residual iron ions in graphite, but also can shorten the purification time more than half.