Abstract:Nickel(Ⅱ) and cobalt(Ⅱ) were simultaneously extracted from magnesium and calcium synthetic sulphate solution by carboxylic extractant Versatic10. The optimum extraction conditions include temperature of 25 ℃, oscillation intensity of 200 r/min, oscillation duration of 4 min, initial pH of 2.5, O/A=1/3, and saponification rate of 60%. After washing twice with deionized water at pH 5.70 and O/A=1/1, the co-extraction rates of calcium and magnesium are both 0.5% below. The stripping rates of nickel and cobalt are both 99% above by 2 mol/L sulfuric acid and O/A=1/1.