Effect of Agitation Speed and Leaching Time for Nickel Recovery of Morowali Limonite Ore in Atmospheric Citric Acid Leaching
Keywords:
Atmospheric leaching, Limonite ore, Agitation speed, Citric Acid, Leaching timeAbstract
This research work deals with atmospheric citric acid leaching of limonite ore from Morowali, Central Sulawesi by applying agitation speed and leaching time parameters. The composition of limonite ore treatment was characterized by X-Ray Fluorescence (XRF) method. Its containt dominated by iron 84.2 % and enrichment nickel content up to 5.15 %. The microstructure image of limonite ore was observed by Scanning Electron Microscope (SEM) whereas nickel recovery was confirmed by Atomic Absorption Spectroscopy (AAS). Leaching process was conducted by using citric acid in a flask on a magnetic heated stirrer at constant temperature. The effect of agitation speed on atmospheric leaching in citric acid indicated enhancement of nickel recovery. The agitation speed ranges employed were 100 to 1000 rpm with leaching times of 10 to 120 minutes. This study revealed that atmospheric citric acid leaching of limonite ore from Morowali under the condition temperature 70 oC, acid concentration 1 M, agitator speed 1000 rpm could recover nickel of 2824 ppm at 120 minutes of leaching time.
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