Equilibrium studies of cobalt(II) extraction with 2-pyridineketoxime from mixed sulphate/chloride solution.

Karolina Wieszczycka,Irmina Wojciechowska,Aleksandra Wojciechowska,Andrzej Olszanowski,Marta Krupa

doi:10.1007/s10967-015-4246-7

Karolina Wieszczycka, Irmina Wojciechowska + Show 3 more

Open Access

https://doi.org/10.1007/s10967-015-4246-7

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Abstract

In present paper the equilibrium of cobalt extraction with 1-(2-pyridyl)tridecan-1-one oxime from the chloride/sulphate solutions was studied. The presented results indicated that extraction depends on a number of process variables, including the pH, metal and Cl− concentration in the aqueous feed, and concentration of the oxime in the organic phase. The created cobalt-complexes with the 2-pyridine ketoxime were stable and only concentrated HCl was found to be a suitable stripping agent for coordinated metal. The separation of Co(II) from Zn(II), Ni(II) and Cu(II) was also studied, but the selective recovery of the metals was possible using the multi-stage stripping process.

Highlights

Cobalt is a strategic and critical metal, which is used in many branches of industry e.g. as a component in superalloys, as a binder for tungsten carbide cutting tools, as pigments in glass, ceramics and paints, as catalysts in the petroleum industry and as an additive to Ni-metal hydride battery [1]
The effect of shaking time on the extraction of 0.01 mol/dm3 Co(II) from aqueous sulphate/chloride solution (0.5 mol/ dm3 SO24À and 1 mol/dm3 Cl-) using 0.1 mol/dm3 1-(2pyridyl)tridecan-1-one oxime dissolved in toluene with 10 % (v/v) addition of decan-1-ol was investigated over the range 5–60 min
The extraction of cobalt(II) from the chloride/sulphate aqueous solutions with the oxime of 1-(2-pyridyl)tridecan1-one was studied as a function of pH, temperature, metal and chloride ions’ concentration in the aqueous feed, and concentration of the oxime in the organic phase

Summary

Introduction

Cobalt is a strategic and critical metal, which is used in many branches of industry e.g. as a component in superalloys, as a binder for tungsten carbide cutting tools, as pigments in glass, ceramics and paints, as catalysts in the petroleum industry and as an additive to Ni-metal hydride battery [1]. Hybrid hydrochloric–sulphuric acidic leaching of a laterite ore has been proposed by Intec Limited and in this concept H2SO4 was used to regenerate HCl—a main leaching agent This process was not as effective as the chloride-circuits, but the observed effects led to continue of the studies [4]. A different hybrid process operates in a mixed chloride–sulphate magnesium brine system has been proposed by Anglo Research Nickel process (ARNi process) [5, 6] In this concept decoupling reagents’ regeneration is promoted by utilising lowered solubility of magnesium sulphate in magnesium chloride solution and as a consequence, the resulting hydrochloric acid acts as the main circulating leach agent.

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