Iron is the major impurity in pregnant leaching solutions (PLS) derived from heap and atmospheric acid of low-grade laterite ores. The PLS can be considered as a secondary resource for synthesis high added-value iron nanomaterials, provided that selectively separated polymetallic solution. In this study, feasibility selective separation was investigated by applying solvent extraction technique ...

this work describes a route for recovering nickel, cobalt, iron, zinc and lanthanides from spent nickel-metal hydride batteries. Formic acid was used as leachant. Experiments were run at 25-50°C 1-4 h. Under the best conditions leaching yields surpassed 99 wt.%, except iron. The insoluble matter contains almost solely iron iron(III) basic formate. leachate went through six separation procedures...