Separation of Iron and Nickel from a Spent Etching Solution by Solvent Extraction using Mixer-settler

摘要

Solvent extraction and stripping experiments were conducted to separate iron from a spent FeCl3 etching solution containing nickel. In the operation of mixer-settler. 7 extraction stages with 1.0 M Alamine336 in toluene, led to 98 percent extraction percentage of iron at equal phase ratio, when the flow rate of organic and aqueous were 35 mL/min and 5 mL/min, respectively. At equal phase ratio of aqueous to organic, 10 stripping stages with 0.01 M HCl solution resulted in 99 percent stripping percentage of iron when the flow rate of stripping solution and loaded organic were 5 mL/min and 35 mL/min, respectively. The concentration of iron in the stripped solution was 133 g/L and this solution could be reused in the etching of nickel lead frame.