Separation of Neodymium and Dysprosium from Aqueous Solutions Using Metal(IV) Phosphate Compounds

Project no. 22389 · Status: Kapanmış · 2021

Summary

Neodymium and dysprosium are the main components of magnets used in electronic devices, especially computers. Since the supply of rare earth elements is limited, obtaining these elements from secondary sources has become very important.In this study, tin phosphate and titanium phosphate compounds were prepared and characterized. The effects of initial pH, contact time and initial metal concentration parameters on Nd(III) and Dy(III) uptake in single element solutions were investigated. In the ternary solutions containing Nd(III), Dy(III) and Co(II) ions, separation studies were carried out depending on the metal concentration and pH change.For tin phosphate, the maximum uptake capacity of Nd(III) and Dy(III) was obtained at pH 4 and pH 3, respectively. The maximum monolayer sorption capacity was calculated as 68.03 for Nd(III) and 58.14 mg/g for Dy(III). The highest distribution coefficient values in ternary solutions were calculated as 14601.6 mL/g for Nd(III) and 7788.48 mL/g for Dy at initial metal concentration of 0.15 mmol/L and initial pH 4 conditions. Maximum selectivity coefficient values for Nd(III)/Co(II) and Dy(III)/Co(II) were determined as 22.80 and 18.76, respectively. Desorption efficiencies were found to be 52.27% and 56.08% for Nd(III) and Dy(III) in a single step with 1 mol/L HNO3, respectively.For titanium phosphate, the maximum uptake capacity of Nd(III) and Dy(III) was obtained at pH 6 and pH 4, respectively. The maximum monolayer sorption capacity was calculated as 40.16 mg/g for Nd(III) and 26.95 mg/g for Dy(III). The highest distribution coefficient values in ternary solutions were calculated as 2716.01 mL/g for Nd(III) and 8600.8 mL/g for Dy(III) at initial metal concentration of 0.075 mmol/L and initial pH 6 conditions. Maximum selectivity coefficient values for Nd(III)/Co(II) and Dy(III)/Co(II) were determined as 20.04 and 53.78, respectively. Desorption efficiencies for Nd(III) and Dy(III) in a single step with 1 mol/L HNO3 were found to be 50.16% and 53.04%, respectively.

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