Behavior of the chromite tailings in a centrifugal concentrator (FALCON)

Freire, Leandro Araujo; Leite, José Yvan Pereira; Silva, Daniel Nunes da; Silva, Bruno Gonçalves da; Oliveira, José Carlos Silva

doi:10.1590/0370-44672018720016

Cited by 1 publication

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The wide range of compositions in the PCMZ ores is also believed to have an influence on the density of chromite, which ranges from 4.50 to 4.80 g/cm 3 . The densities of the most common gangue silicates range from 2.50 to 3.20 g/cm 3 . This large differential in chromite and gangue silicate densities allows it to be beneficiated using gravity techniques, particularly spirals [1].…”

Section: Chromite Chemistrymentioning

confidence: 99%

See 1 more Smart Citation

A Process Mineralogical Evaluation of Chromite at the Nkomati Nickel Mine, Uitkomst Complex, South Africa

et al. 2020

View full text Add to dashboard Cite

A process mineralogical study based on three texturally and mineralogically different chromite-bearing ore types at the Nkomati nickel mine was undertaken, with focus on chromite. Chromite is a by-product of the Ni-Cu-Co-PGE ore at Nkomati Nickel mine. These being the PCMZ_MG (medium-grade Ni-Cu sulphide silicate ore with disseminated chromite), PCMZ_HG (high-grade Ni-Cu sulphide silicate ore containing disseminated chromite) and MCHR (massive chromite unit) ore types. These were processed using benchtop flotation followed by gravity concentration using a shaking table at different grind sizes. Quantitative mineralogical data was obtained using a 600F Mineral Liberation Analyser for the unprocessed and processed ores at three selected target grinds. The Mineral Liberation Analyser data indicated that increased milling does not relate to increased chromite grades and recoveries, particularly for the disseminated PCMZ type ores based on laboratory-scale gravity concentration. The recovery is controlled largely by the chromite chemistry. The results also showed that the MCHR samples that underwent a pre-flotation stage before gravity separation had better Cr2O3 grades (45% to 47%) and recoveries (52% to 61%) than MCHR ore that did not undergo a pre-flotation stage, which recorded grades ranging from 44% to 46% and recoveries ranging from 43% to 60%. This holds promise for the blending of MCHR ores with the PCMZ ores. The PCMZ ores also displayed better Cr2O3 grades and recoveries at coarser grinds. The optimal target grind to process all three ore types is a P80 of 75 μm, which is the current grind size employed at Nkomati Nickel mine. Due to the low nickel price and grade the Nkomati Nickel mine is currently under care and maintenance.

show abstract

Section: Chromite Chemistrymentioning

confidence: 99%

“…Chromite is a member of the spinel group and is the only economically important ore mineral of chromium. It is used extensively by the metallurgical industry as feedstock for ferroalloy production [1][2][3][4]. Chromite ore is commonly classified into different grades based on the Cr/Fe ratio as well as the Cr 2 O 3 content.…”

Section: Introductionmentioning

confidence: 99%