电解回收铁钨锡合金粉中的铁

Recovery iron from Fe-W-Sn alloy powders by electrolysis

以钨渣高温还原熔炼所得的铁钨锡合金粉为原料,通过电解的方法回收其中的铁,研究了Fe2+浓度、pH值、温度和电流密度对电流效率及电解铁纯度的影响。结果表明:在电流密度300 A/m^2、温度45℃、pH=4.5、Fe^2+浓度100 g/L的优化工艺条件下,电流效率为92.1%,电解铁纯度为99.1%;在优化工艺条件下进行了连续4天的电解实验,平均电流效率为87.8%,电解铁纯度在97%以上,阳极泥里钨、锡含量(质量分数)分别为19.7%和20.0%,相对于原料中的钨、锡含量(6.98%,6.91%)分别富集了2.82倍和2.89倍;铁的回收率为92.2%,阳极泥产率为33.0%,吨铁电能消耗为4757 kW·h。SEM像表明电解铁呈不规则棒状。

The Fe-W-Sn alloy powders obtained by high-temperature reduction and smelting process of tungsten residue, as raw material, were electrolyzed to recover iron. And the effects of Fe2+ concentration, pH values, temperature and current density on current efficiency and purity of electrolytic iron were investigated. The results show that, under the optimal conditions of current density 300 A/m^2, temperature 45 ℃, pH 4.5, and Fe^2+ concentration 100 g/L, the current efficiency and purity of the electrolytic iron are 92.1% and 99.1%, respectively. The average current efficiency is 87.8% and the purity of electrolytic iron is above 97% after continuous electrolysis for 4 days under the optimal conditions. The contents of tungsten and tin in the anode slime are 19.7% and 20.0%, which are enriched 2.82 times and 2.89 times compared with the tungsten and tin contents of the raw materials(6.98% and 6.91%), respectively. Meanwhile, the recovery rate of iron is 92.2%, the anode slime yield is 33.0% and the power consumption for producing 1 t of electrolytic iron is 4757 kW·h. The SEM image shows that the morphology of electrolytic iron is irregular-shaped stick.