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 FeCl2 solution with an initial condition of pH value 2.0 and 0.25％( mass fraction) Fe2+.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 Fe2+ ions in solution can be reduced to less than 0.03％.
关键词
高铝粉煤灰/电解除铁/隔膜电解槽/氯化铝溶液
Key words
high-alumina coal fly ash/electrolytic iron removal/diaphragm electrolytic cell/aluminum chloride solution
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