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In the following work the possibility of the nickel recovery by hydrometallurgy extraction for nickeliferous laterites is studied. The work looks for to study the technical viability of the extraction of nickel and cobalt by means of the application of heap leaching. The ore is chemically and physically characterized with the purpose of analyzes its composition and mineral phase, by means of x-rays diffraction, quantitative chemical analysis and elementary chemical analysis by electronic microscopy. Once the ore is characterized, it is mixed with sulfuric acid to relations 0.05; 0.1 and 0.2 g acid/g to agglomerated pellets and paste, with the aim to improve the percolation in column, due to the argillaceous nature of the ore leaching rate ranged from 0.305 to 1.06 x10 l/h*m2 and in the agglomerate condition of the percolation l/h*m2 improves at interval 3.05 to 6.11 x10 l/h*m2. Additionally the agglomerate ones are roasted with the purpose of consolidating them and chemically preparing the ore so that it is susceptible to the leaching, by means of oxides sulphation of the ore to high temperatures. This ore preparation is subject under diverse leaching tests like: dynamic tests and columns tests. The dynamic tests were made for different relations solid-liquid from 0.05 from 0.5 x103 g/l, different concentrations of the leaching solution and different reaction times from 24 to 168 h. As far as the columns tests showed, the variables studied were acid/ore mixture ratio, continuity of the leaching irrigation, reusability of the liquor of leaching and roasted temperature which was done from 673, 873 and 1023 K. With these tests times selectivity for nickel and cobalt versus iron were found, obtaining recovery 17 more times nickel than iron and up to 26 more times cobalt than iron and with an high process speed, where most of the recovery is made in the first 24 h.

Ni, Co recovery study and Fe by acid leaching in columns