水溶液隔膜电解除铁

Iron removal by diaphragm electrolysis in aqueous solution

在用高铝粉煤灰盐酸法制备氧化铝的过程中,粉煤灰中的铁会随酸性浸出液进入氯化铝溶液.为了低成本降低氯化铝溶液中铁杂质的质量分数,提出了在水溶液中电解除铁的方法.除铁实验中使用双室隔膜电解槽,对初始条件为pH值2.0,Fe^(2+)质量分数0.25%的FeCl_(2)溶液进行循环电解,研究了几种常见金属阴极板上单质铁的析出效果.结果表明:使用钛、铁、锡、铜、铅5种金属电极均可在5 h电解后达到90%的除铁率,溶液中亚铁离子的质量分数降低至小于0.03%.

In the process of extracting alumina from high-alumina coal fly ash by hydrochloric acid method,iron in fly ash could enter aluminum chloride solution with acid leachate.In order to reduce the mass fraction of iron impurity in aluminum chloride solution at low cost,the method of removing iron by electrolysis in aqueous solution was put forward.In the experiment of iron removal,a two-cell diaphragm electrolytic cell was used to perform cyclic electrolysis on a FeCl_(2) solution with an initial condition of pH value 2.0 and 0.25%(mass fraction)Fe^(2+).The precipitation effect of elemental iron on several common metal cathode plates was studied.The results show that 90%iron removal efficiency can be achieved after 5 h electrolysis by using titanium,iron,tin,copper and lead electrodes,whose mass fraction of Fe^(2+)ions in solution can be reduced to less than 0.03%.