NDLI: The Effect of Alkali Roasting Pretreatment on Nickel Extraction from Limonite Ore by Using Dissolved $SO_{2}$-Air

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The Effect of Alkali Roasting Pretreatment on Nickel Extraction from Limonite Ore by Using Dissolved $SO_{2}$-Air

Content Provider	MDPI
Author	Wulandari, Winny Kinda, Meiyer Marthen Murida, Rahmaditha Samadhi, Tjokorde Walmiki
Copyright Year	2020
Abstract	Extraction of limonite ore using dissolved SO₂–air is an alternative hydrometallurgical method for nickel recovery. This process is carried out at atmospheric pressure and is shown to have good selectivity of nickel over iron, but with a low recovery yield. The literature refers to the application of alkali roasting as pretreatment in laterite ore leaching to increase nickel recovery. Thus, this study aims to apply the combination method of alkali roasting and leaching to extract nickel from limonite ore (1.33% Ni, 46.61% Fe) from the Southeast Sulawesi region. Three alkali compounds were included in the study (NaOH, Na₂CO₃ and Na₂SO₄). The batch-leaching process was carried out at pH 1 and 3 and temperatures of 55 and 80 $°$ C for 180 min. The leach liquors were sampled at 15, 60, 90 and 120 min, and concentrations of the extracted metals were measured by Atomic Absorption Spectrometry (AAS). A mineralogy characterization of the raw ore and its residue after leaching was undertaken by using X-Ray Diffraction (XRD), while the thermal decomposition behavior of the ore was characterized by Thermogravimetry Analyzer (TGA)/Differential Scanning Calorimetry (DSC). The addition of Na₂CO₃, Na₂SO₄ and NaOH in the ore pretreatment increases nickel recovery from 14.80% without alkali roasting to 23.99%, 28.15% and 39.22%, respectively. The optimum extraction condition for nickel recovery is at pH 1 and a temperature of 80 $°$ C. However, the highest Ni/Fe selectivity of 24,947 is obtained at pH 3 and a temperature of 80 $°$ C, preceded by roasting in the absence of alkali. Compared to other hydrometallurgical processes, the process studied in this work exhibits lower recovery, but provides an alternative to extract nickel from low-grade limonite ore.
Starting Page	701
e-ISSN	2075163X
DOI	10.3390/min10080701
Journal	Minerals
Issue Number	8
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-08-07
Access Restriction	Open
Subject Keyword	Minerals Characterization and Testing of Materials Limonite Ore So2 Pretreatment Alkali Roasting Nickel Leaching
Content Type	Text
Resource Type	Article

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