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VOL. 8, ISSUE 2 (2023)
Leaching of oxide and silicate Ni laterites in dilute hydrochloric acid and aqua regia
Authors
Ifeoma Mary Ugwu
Abstract
Here we investigate the optimum leaching conditions to effectively
extract nickel and cobalt as well as other metals in oxic and silicate Ni
laterites. Metals were extracted using 2.75 M HCl and 2.75 M Aqua Regia in
0.01M NaNO3 at 100 °C, with a 1.004 acid to ore ratio and a liquid
to ore ratio of 10:1. Leaching of Ni
laterites obtained from Cerro Matoso and Kalgoorlie, resulted to 100% Ni, 66.9
to 100% Co, 75.6 to 100% Al, 34.3 to 89.7% Fe, 87.6 to 100% Mg, 77.4 to 100% Mn
extraction in 2.75 M HCl for 0.8 to 4 hours. In contrast, leaching of these Ni
laterites in 2.75 M qua Regia for 0.3 to 6.7 hours. yielded 90.4 to100% Ni,
94.2 to 100% Co, 68.9 to 100% Al, 33.6 to 100% Fe, 93.5 to 100% Mg and 69.7 to
100% Mn. Aqua Regia with concentration of 2.75M is more effective for
extraction of metals from high- and low-grade oxide and silicate Ni laterites
compared to 2.75M HCl.
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Pages:46-52
How to cite this article:
Ifeoma Mary Ugwu "Leaching of oxide and silicate Ni laterites in dilute hydrochloric acid and aqua regia". International Journal of Multidisciplinary Education and Research, Vol 8, Issue 2, 2023, Pages 46-52
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