Activation pretreatment of limonitic laterite ores by alkali-roasting using NaOH |
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Authors: | Qiang Guo Jing-kui Qu Tao Qi Guang-ye Wei Bing-bing Han |
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Institution: | 1.National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Beijing,China;2.Key Laboratory of Green Process and Engineering, Institute of Process Engineering,Chinese Academy of Sciences,Beijing,China;3.Graduate School of Chinese Academy of Sciences,Beijing,China;4.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,China |
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Abstract: | Activation pretreatment of Cr-containing limonitic laterite ores by NaOH roasting to remove Cr, Al, and Si, as well as its
effect on Ni and Co extraction in the subsequent pressure acid leaching process was investigated. Characterization results
of X-ray diffraction (XRD) and scanning electron microscopy/X-ray energy dispersive spectroscopy (SEM/XEDS) show that goethite
is the major Ni-bearing mineral, and chromite is the minor one. Experimental results show that the leaching rates of Cr, Al,
and Si are 95.6wt%, 83.8wt%, and 40.1wt%, respectively, under the optimal alkali-roasting conditions. Compared with the direct
pressure acid leaching of laterite ores, the leaching rates of Ni and Co increase from 80.1wt% to 96.9wt% and 70.2wt% to 95.1wt%
after pretreatment, respectively. Meanwhile, the grade of acid leaching iron residues increases from 54.4wt% to 62.5wt%, and
these residues with low Cr content are more suitable raw materials for iron making. |
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Keywords: | |
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