Abstract
The effect of nil metal complexation and complexing nickel, cobalt, copper, zinc and manganese, both individually and collectively, on the chemical stability of LIX® 63 hydroxyoxime (‘hydroxyoxime’) when in the presence of Versatic 10 and tributyl phosphate (TBP) under synthetic nickel laterite extract conditions at 45°C has been assessed. Hydroxyoxime degradation was observed at pH 5.5–6.0 even in the absence of metal complexation, resulting in half lives of 53–56weeks. Although loading up to 0.2g/L of copper, cobalt or zinc had no material effect, progressively increasing the loading of these individual metals up to 3g/L resulted in hydroxyoxime half lives decreasing to 12, 21 and 28weeks, respectively. Manganese loading of 0.5–2.0g/L also had an adverse effect, with a half life of 31weeks. In contrast, nickel loading up to 4.6g/L had little or no adverse effect on half life (48weeks). Based on the present results, increasing hydroxyoxime half life can be achieved by minimising copper and manganese loading.
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