Iron ore tailings dry stacking in Pau Branco mine, Brazil

Gomes, Reinaldo Brandão; Tomi, Giorgio de; Assis, Paulo Santos

doi:10.1016/j.jmrt.2016.03.008

Cited by 44 publications

(23 citation statements)

References 5 publications

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“…Significant quantities of tailings are generated in mining activities as a result of the purification stages of the ore of interest, thus becoming a socioenvironmental problem because of the presence of toxic elements in the waste generated . Tailings are stored in large containment dams designed to last infinitely; however, in 2015, the world witnessed the rupture of the Fundão dam in the municipality of Mariana in Minas Gerais, Brazil, resulting in the leakage of millions of cubic meters of mining waste into the environment, , causing pollution of the ecosystem, the death of several aquatic species and the death of 19 people affected by such toxic waste …”

Section: Introductionmentioning

confidence: 99%

Valorization of Mining Waste in the Synthesis of Organofunctionalized Aluminosilicates for the Esterification of Waste from Palm Oil Deodorization

LeiteLima

Queiroz

Pires

et al. 2019

ACS Sustainable Chem. Eng.

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The synthesis of aluminosilicate Al-MCM-41 was performed using mining kaolin waste as an alternative source of silicon and aluminum to add value to this waste. In a preliminary stage, acid leaching was carried out with the kaolin residue with three different durations (1, 1.5 and 2 h) to evaluate the leaching time that provided the highest amounts of silicon and aluminum in the tailings. Molecular sieves were synthesized by the hydrothermal method and calcined at 550 °C to eliminate the surfactant. X-ray diffractograms of the synthesized samples revealed that the sample AM41-2H, obtained from kaolin leached for 2 h (MC7-2H), presented the best structural arrangement due to the presence of 2θ angles close to 2.32°, a specific surface area of 1016 m2·g–1, a pore volume of 0.80 cm3·g–1, and a pore diameter of 3.14 nm, which are characteristic of Al-MCM-41. A sample of AM41-2H was functionalized with 3-mercaptopropyltrimethoxysilane (MTPS) (5 mmol MTPS/g AM41-2H). To eliminate excess unaltered MTPS on the surface of the material, the functionalized aluminosilicate (AM41-2H-F) was subjected to a purification step. The organic functional group that remained in the molecular sieve (−SH) was then oxidized to its corresponding acid group (−SO3H) to form stronger acid sites. Then, the heterogeneous catalyst obtained (AM41-2H-O) was tested in an esterification reaction of oleic acid with methanol and in an esterification reaction of an industrial waste from palm oil refinement (DDPO), which is generated during the deodorization process of palm oil. Both reactions were carried out for 2 h at 130 °C, with a fatty acid/methanol molar ratio of 1:30 and addition of 5% catalyst to the mass of fatty acid. The results obtained revealed that the conversion to esters from oleic acid and DDPO was 99% and 98%, respectively, in contrast to the uncatalyzed reaction, which achieved only 15% conversion. The catalysts used in the reactions were recovered and reused in the same conditions as the initial reactions, which showed conversions in this first cycle of catalyst reuse of 98% for oleic acid and 81% for DDPO, proving the efficiency of the catalyst synthesized from industrial kaolin waste.

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Section: Introductionmentioning

confidence: 99%

Valorization of Mining Waste in the Synthesis of Organofunctionalized Aluminosilicates for the Esterification of Waste from Palm Oil Deodorization

LeiteLima

Queiroz

Pires

et al. 2019

ACS Sustainable Chem. Eng.

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“…In order to ensure compaction of the particulate network and achieve crucial residual moisture contents, sufficient filtration pressure is necessary. Therefore, filter presses can be used (Gomes et al 2016).…”

Section: • ! •" #mentioning

confidence: 99%

Towards prediction of cake detachment in tailings filtration

Fränkle¹,

Morsch²,

Nirschl³

2021

Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings

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By offering an opportunity to fulfil environmental and process water recovery specifications, filtration of tailings has received increasing attention. In the process, complete cake detachment is required to maintain high throughputs. Incomplete discharge represents a bottleneck in the process. Therefore, a deeper understanding of cake detachment behaviour is a key to success. Experimental studies on adhesion forces between filter cake and cloth are a first step towards detachment prediction. Filtrations using an FLSmidth lab filter press and subsequent adhesion measurements with iron ore tailings and two different filter media show the influence of filtration pressure on adhesion.

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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 [1,2]. Tailings dams have been the preferred method of disposal of such materials [3]. However, recent dam breach events in Brazil [4] and the growing demand for mineral goods [5] have enhanced the appeal of alternative tailings disposal methods and a more effective recovery of minerals contained in such tailings [3,[6][7][8][9][10][11][12][13][14][15].…”

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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Iron ore tailings dry stacking in Pau Branco mine, Brazil

Cited by 44 publications

References 5 publications

Valorization of Mining Waste in the Synthesis of Organofunctionalized Aluminosilicates for the Esterification of Waste from Palm Oil Deodorization

Valorization of Mining Waste in the Synthesis of Organofunctionalized Aluminosilicates for the Esterification of Waste from Palm Oil Deodorization

Towards prediction of cake detachment in tailings filtration

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

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