Wet High-Intensity Magnetic Separators (WHIMS) for Recovering Iron from Tailings Deposited in Dams

Rocha, Rafaella Bicalho da; Reis, Érica Linhares; Ribeiro, José Pancrácio

doi:10.1080/08827508.2019.1672061

Cited by 11 publications

(11 citation statements)

References 22 publications

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“…Pairs 1 and 4, 2 and 5, 3 and 6, 7 and 10, 8 and 11, and 9 and 12 were performed under the same conditions (GAP, magnetic field, and wash water pressure) except for the solid feed percentage; the odd ones were performed with 50% solids in the feed, and the even ones, with 30%. The even ones presented a concentrate with a lower content of contaminant because the higher the mineral dilution, the lower the probability of non-magnetic particle entrainment into the concentrate (Rocha et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

“…The smaller the GAP, the greater the gradient caused by the matrix. Consequently, the increased gradient causes a larger proportion of nonmagnetic particles to be entrained into the concentrate (Ribeiro & Ribeiro, 2013;Ribeiro & Ribeiro, 2017;Pinto & Delboni Júnior, 2019;Rocha et al, 2019). Tests 1 and 7, 2 and 8, 3 and 9, 4 and 10, 5 and 11, and 6 and 12 were performed under the same conditions (feed solids percentage, magnetic field, and washing water pressure), except for the matrix opening, with the former being performed with a GAP of 1.5 mm, showing higher selectivity, and the latter with a GAP of 1.0 mm.…”

Section: Resultsmentioning

confidence: 99%

“…However, the proportion of contaminants also increases. A possible explanation is the reduction of the matrix area due to the large amount of material deposited in it, which, in addition to attracting non-magnetic material to the concentrate, increases the pulp runoff (Gomes et al, 2011;Ribeiro & Ribeiro, 2013;Pinto & Delboni Júnior, 2019;Rocha et al, 2019). Tests 1 and 3, 4 and 6, 7 and 9, and 10 and 12 were performed under the same conditions (feed solids %, GAP, and washing water pressure), except for the magnetic field intensity; the first ones were performed with a magnetic field of 11,000 Gauss and showed a higher SiO 2 content in the concentrate, and the second ones, with a field of 7,000 Gauss.…”

Section: Resultsmentioning

confidence: 99%

“…The iron-ore tailings (characterized) were subjected to magnetic concentration tests in a Wet High-Intensity Magnetic Separator (WHIMS) separator by varying the operational parameters matrix opening (GAP of 1.0 or 1.5 mm), solid feed percentage (30 or 50%) and magnetic field intensity (7,000, 9,000 or 11,000 Gauss). These values were suggested for concentration of fine-grained iron ore tailings by Gomes et al (2011), Castro & Peres (2013), Silva et al (2017), Pinto & Delbion Júnior (2019) and Rocha et al (2019). Table 1 contains the conditions of the 12 magnetic concentration tests performed.…”

Section: Introductionmentioning

confidence: 82%

“…Pinto & Delboni Júnior (2019) confirm the potential for pellet feed production from four tailings dams in the state of Minas Gerais through magnetic concentration. Rocha et al (2019) recovered around 15% of the material disposed in a pond trough the magnetic concentration of the tailings. Their study showed that, in Brazil, on average, 33% of the iron ore is rejected as tailings during beneficiation.…”

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confidence: 99%

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Magnetic concentration route for recovering pellet feed fines stored in a mining dam

Gomes

Papini

2022

REM, Int. Eng. J.

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The greatest and noblest challenge of mining engineering for the present and the future of iron ore treatment could be considered as the pursuit of optimizing the use of mineral resources. The use of mining tailings, in the mineral sector itself, or in another industrial branch, meets the needs of circular economy as it increases the useful service life of this material. In order to investigate this scenario, a technological characterization of a sample from a tailings dam was carried out along with magnetic concentration tests in a Wet High-Intensity Magnetic Separator (WHIMS) to propose a possible concentration route. In relation to the characterization itself, the results demonstrated a relative density of 3.04 x 10 3 Kg/m 3 and an average superficial specific area of 3.75 cm³/g. The granulometric analysis classified the material as fine, with d 90 of 0.110 mm and d 50 ≅ 0.049 mm. Quartz, hematite, goethite, kaolinite and manganese oxide were identified in the sample. The test which presented the best results (66.83% Fe and 1.74% SiO 2 ) consisted of the Rougher, Cleaner and Recleaner phases, using a 1.5 mm grooved GAP matrix, a 7,000 Gauss magnetic field, 30% solids, and water pressure at 0.5 kgf/cm 2 (49.0 x 10 3 Pa). Finally, the conclusive results indicate that the studied material can be concentrated through magnetic concentration, keeping in mind the specifications concerning the pellet feed fines commercial product. Besides the financial gain, the activity prolongs the durability of the tailings dam and reduces the environmental impacts associated with these structures.

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Section: Resultsmentioning

confidence: 99%