Due to the serious pollution and great harm of steel pickling waste liquor, the treatment of the waste liquor with high concentration of iron ion has been a problem in a lot of countries around the world. A simple electrochemical method is proposed for recovering iron from steel pickling waste liquor with graphite plates as electrodes. This study investigated the effects of reaction parameters on the concentration of residual total iron (TFe) in steel pickling waste liquor, including initial pH, reaction temperature, electrode distance, current density, and electrolytic time. Under the optimal reaction condition, the removal efficiency of TFe was 99.98%. The obtained precipitates were measured by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. It was found that the precipitates were high purity of Fe₃O₄ with small amount of γ-Fe₂O₃. This method will provide an effective and potential solution for resource recycling of steel pickling waste liquor.

由于钢酸洗废液的严重污染和巨大危害，在世界许多国家中，高铁离子浓度废液的处理一直是一个问题。提出了一种简单的电化学方法，以石墨板为电极从钢酸洗废液中回收铁。这项研究调查了反应参数对钢酸洗废液中残余总铁浓度的影响，包括初始pH，反应温度，电极距离，电流密度和电解时间。在最佳反应条件下，三元铁的去除率为99.98％。通过X射线衍射（XRD），X射线光电子能谱（XPS）和拉曼光谱来测量获得的沉淀物。发现沉淀物是高纯度的铁₃ ö ₄与γ-的Fe少量₂ ö ₃。该方法将为钢酸洗废液的资源回收提供有效和潜在的解决方案。