The investigations and possibility of leaching or bioleaching from nickel bearing laterite ores

Krstev, Boris; Golomeov, Blagoj; Golomeova, Mirjana; Krstev, Aleksandar

doi:10.1016/j.copbio.2011.05.176

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“…Scanning electron microscopy (SEM) analyzes (Figure ) indicated that Ni is mainly concentrated in the finer fractions and associated with iron oxides and hydroxides. This result reflected the prevailing mineralogy and associated element distribution within the oxide laterite profiles, where Fe and Ni distribution is controlled by relatively few minerals predominantly goethite and, to a lesser extent, the Fe 3+ ‐bearing smectite denominated nontronite …”

Section: Resultsmentioning

confidence: 75%

Characterization and bioleaching of nickel laterite ore using Bacillus subtilis strain

Giese

Carpen

Bertolino

et al. 2019

Biotechnology Progress

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There are two principal types of nickel (Ni) deposits: sulfide and laterite ores. Interest in low‐grade Ni‐laterite ores has increased in recent years as high‐grade Ni‐sulfide deposits are being quickly depleted. However, processing of Ni laterites has proven technically difficult and costly, and the development of alternative low‐cost biotechnologies for Ni solubilization has been encouraged. In this context, by the first time, a sample of Brazilian Ni‐laterite ore was analyzed mineralogically and subjected to bioleaching tests using a heterotrophic Bacillus subtilis strain. SEM‐analysis indicated that the primary Ni carrier mineral is goethite. Chemical analysis of different grain size fractions indicated a homogeneous distribution of Ni. XRF‐analysis showed that the ore consists mainly in lizardite (32.6% MgO) and contains1.0% NiO (0.85% Ni). Bioleaching batch experiments demonstrated that about 8.1% Ni (0.7 mg Ni/g ore) were solubilized by the B. subtilis after 7 days. Application of microwave heating as a Ni‐laterite pretreatment was also tested. This pretreatment increased the bioextraction of Ni from 8% to 26% (2.3 mg Ni g−1 ore).

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Section: Resultsmentioning

confidence: 75%