Caracterização Do Resíduo Da Flotação Do Minério De Zinco

Costa, Raquel Húngaro; Vinhal, Jonathan Tenório; Espinosa, Denise Crocce Romano; Tenório, Jorge Alberto Soares

doi:10.5151/2594-357x-33193

Cited by 2 publications

(2 citation statements)

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“…SEM was an important analysis done in this characterization since it showed that the tailings consist of disaggregated particles of hematite, dolomite, and quartz, which allows the physical separation of the material. [18,19] Thus, to concentrate the hematite from zinc mine tailings, two magnetic separation routes were studied.…”

Section: Methodsmentioning

confidence: 99%

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

et al. 2020

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The volume of tailings produced by the extractive industry has been increasing due to the processing of the low-grade ore. This issue can cause environmental accidents and require significant investment to control the disposal of tailings. Therefore, this study aims to recover iron from zinc mine tailings by wet magnetic separation followed by the carbothermal reduction of self-reducing briquettes. Two magnetic separation routes were investigated to concentrate iron. Zinc mine tailings were processed by route I, in a rougher stage followed by a scavenger stage; and route II, in a rougher stage followed by a cleaner stage. The carbothermal reductions were performed using self-reducing briquettes composed of Fe concentrate from the route with high Fe content and charcoal. The products were analyzed by scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), x-ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), and volumetric chemical analysis. Magnetic separation route II provided the highest-grade Fe concentrate, 52% Fe, while route I provided 33% Fe. In the carbothermal reductions, a metallization degree of 98% in the Fe concentrate briquette, 97% in the briquette with a 10% replacement of its raw material by Fe concentrate, and 99% in the hematite briquette was reached. The replacement of raw material by Fe concentrate showed no significant change in Fe recovery. Considering the whole process, magnetic separation and carbothermal reduction, the recovery of Fe from the zinc mine tailings was 67%. Therefore, the process route suggested in this study will not only reduce tailings disposal and consequently the risk of environmental accidents, but it will also provide profitable raw material for the steel industry.

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Section: Methodsmentioning

confidence: 99%

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

et al. 2020

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“…Part of the material contained in the Aroreira dam is reclaimed and fed into the processing plant to recover the remaining zinc content. Several studies on the recovery of different minerals from tailings dams have been conducted; their focus was the recovery of zinc [23], iron [1,24,25] and dolomite [26]. In view of the outlook for higher iron grades in the ROM material, an industrial magnetic concentration test unit has been in operation since 2021.…”

Section: Introductionmentioning

confidence: 99%

Optimization of magnetic separation of hematite contained in the depressed product from vazante mine s zinc ore flotation

Rayes¹,

Fantato²,

Deursen³

et al. 2023

Tecnol. Metal. Mater. Min.

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The mining industry has seen a significant decline in mill feed grade in recent years, resulting in an ongoing build-up of materials not recovered at the mineral processing plants whose economic value has not yet been determined. Tailings dams have been the preferred method of disposal of such materials. However, recent dam breach events and the growing demand for mineral goods have enhanced the appeal of a more effective use of mined materials to prevent tailings accumulation and reduce social and environmental impacts, in line with the environmental, social and governance (ESG) principles that most companies have adopted. Different techniques can be used to recover economically valuable minerals contained in such materials, among which magnetic separation stands out for reasons of cost, production capacity, and recent developments of new equipment and matrices for wet high-intensity magnetic separators. The outcome includes gains in capacity, grade, and recovery yield. This paper assessed the use of a matrix developed by the company Gaustec, called BigFlux, in the magnetic separation of depressed product from the flotation process at Nexa Resources's Vazante mine. Laboratory-scale magnetic separation tests were conducted using standard and an optimized matrix. For a 59% iron concentrate, the metallurgical recovery using such optimized matrix reached 72.6%, up 4% from the figure resulting from the use of the standard matrix, thus indicating that the use of the optimized matrix can improve the magnetite recovery process of the studied material.

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Caracterização Do Resíduo Da Flotação Do Minério De Zinco

Cited by 2 publications

References 0 publications

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

Optimization of magnetic separation of hematite contained in the depressed product from vazante mine s zinc ore flotation

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