Upgrade and separation of Co from solution with low-grade Co

Abstract

Upgrade and separation of Co from solution with low-grade Co were studied. In the solution, the content of Co is about 1 g·L⁻¹, while that of Ni, Zn, Mn, Mg, Si and Ca is 0.145, 1.108, 0.119, 6.672, 0.026 and 0.200 g·L⁻¹, respectively. After absorbed with absorbent G − 1, the content of Co in the solution is less than 1 mg·L⁻¹, the average loss rate of Co is 0.07%, while the average loss rate of Mg is 67.92%. It is demonstrated that the absorbent has selectivity to absorb Co. After the absorbent was eluted with HCl at room temperature, the solution with higher content of Co was obtained. Through being evaporated and concentrated, the contant of Co in the solution can be upgraded to 26.6 g·L⁻¹. At the same time, most of Si, Mg is removed, the total recovery of Co can reach as high as 98.7%. The content of Pb, Ni, Cu, Zn, Mn in the discharge solution is 1.00, 0.26, 0.21, 0.09, 0.15 mg·L⁻¹, respectively, and the discharge solution can reach the national discharge standard. CoCl₂ solid can be obtained and can reach chemical purity.

Keywords

Co / upgrade / separation

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