Selective leaching of nickel from prereduced limonitic laterite under moderate HPAL conditions- part I: Dissolution
High pressure acid leaching (HPAL) is the primary method for extraction of nickel from limonitic laterite. The severe operating conditions, the complexity of facilities, and several technical problems, such as scale formation, have always accompanied the HPAL, however. In this paper, the...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2016-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2016/1450-53391600023C.pdf |
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| Summary: | High pressure acid leaching (HPAL) is the primary method for extraction of
nickel from limonitic laterite. The severe operating conditions, the
complexity of facilities, and several technical problems, such as scale
formation, have always accompanied the HPAL, however. In this paper, the
selective acid leaching of nickel from the pre-reduced limonitic laterite
under moderate HPAL conditions was studied. For the calcine with reduction
degree of 93.4%, about 88.2% nickel could be selectively extracted at 100°C
with an acid/ore ratio of 0.164, leaving less then 5.0g/L iron in the
solution. Further increase of leaching temperature, and the ensuing
dehydration, transformed goethite in the leaching residue to hematite. When
the temperatures were as high as 180°C, the recovery of nickel increased to
95.2%, within one hour, depressing the residual soluble iron to below 1.0g/L
(pO2= 1.0 MPa, acid/ore= 0.287). |
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| ISSN: | 1450-5339 2217-7175 |