Reciclagem de aminas na flotação de minério de ferro

Araujo, Danielle M.; Yoshida, María Irene; Carvalho, Cornélio F.; Stapelfeldt, Frank

doi:10.1590/s0370-44672008000400008

Cited by 9 publications

(8 citation statements)

References 3 publications

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“…During the flotation process, the hematite is adsorbed by starch molecules in the lower part of the flotation machine and follows the water flux as concentrated pellets, while the amine is adsorbed onto the quartz surface, forming the frother. The latter is then collected at the top of flotation machine and spilled as tailings into a dam (da Luz and Lin, 2002; Araújo et al, 2008). Given this process, it may be inferred that the tailings released by the disruption of the Fundão dam could be rich in both sediments (quartz) and the toxic chemicals used in reverse cationic flotation, such as ether amine and Na.…”

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confidence: 99%

Understanding the Environmental Impact of a Mine Dam Rupture in Brazil: Prospects for Remediation

et al. 2019

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The rupture of the Fundão mine dam in Mariana municipality, Minas Gerais State, Brazil, spilled the tailings across the Doce River basin. These tailings, composed of residues discarded from the beneficiation of iron ore, are rich in SiO 2 and Al 2 O 3 , as well as some ether amine compounds and NaOH. The aim of this study was to assess the distribution of these sediments, as well as their effect on the riparian zones reached, as compared with preserved sites. Sediment deposition in the river resulted in a morphological change from a meandering profile to a braided aspect. The nutrient and mineral content (P, K, Ca, Mg, Cu, Fe, Mn, Zn, and NO 3 − ) and soil organic matter of the sediments were depleted, whereas NH 4 + , Na, and pH increased. A random presence of ether amines in the sediments was confirmed by quantitative and chromatographic analyses, with concentrations ranging from 0 to 57.8 mg kg −1 ; Na reached values as high as 150 mg kg −1 . The impact of the dam tailings on biota was assessed by estimating total microbial biomass (phospholipid fatty acids), which were depleted in sediments relative to soils from preserved sites. Overall plant mortality, as well as a low resilience capacity, were also observed. Ether amines and Na present in the sediments had a strong toxic effect in the environment. Identification of these substances as the main impact factors will help guide future remediation efforts.

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Understanding the Environmental Impact of a Mine Dam Rupture in Brazil: Prospects for Remediation

et al. 2019

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“…Nem toda a concentração de reagente utilizada é absorvida pelas partículas minerais. Segundo Araujo et al (2008), cerca de 50% da amina é perdida na água flotada.…”

Section: Dosagem De Reagentesunclassified

Calibração e validação de modelo dinâmico de circuito de flotação industrial

Guimarães

Faustino

Raffo

et al. 2021

Procedings Do XV Simpósio Brasileiro De Automação Inteligente

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This work presents the calibration and validation of a dynamic simulator of a complete industrial flotation circuit. The simulator, implemented in the software IDEAS, reproduces the stages rougher, cleaner, recleaner, and scavenger of the iron ore flotation circuit of the Conceição plant II, Vale S.A. The process dynamic behaviour is based on phenomenological models and empirical considerations. Real mass balance and mineral concentration data were used during the calibration and validation of the simulator. The results indicate the simulated circuit performed very close to the real one, with average relative error of the concentration content of the product of each stage of 0.86%. Resumo:Este trabalho apresenta a calibração e validação de um simulador dinâmico de um circuito completo de flotação industrial. O simulador, implementado no software IDEAS, reproduz os estágios rougher, cleaner, recleaner e scavenger do circuito de flotação de minério de ferro da usina de Conceição II, Vale S.A. O comportamento dinâmico do processo é descrito através de modelos fenomenológicos e considerações empíricas. Dados reais de balanço de massa e concentração mineral foram usados durante a calibração e validação do simulador. Os resultados indicam desempenho do circuito simulado muito próximo ao real, com erro relativo médio do teor de concentração do produto de cada estágio de 0,86%.

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“…The impact of the dam tailings also compromised agricultural and fishing activities, as attested by both anecdotal registries of the local community and the literature [3]. The main environmental impact caused by the dam tailings was related to the high levels of ether-amine/ammonium and sodium found in the sediments, which are used in the iron ore beneficiation process by the Samarco mine [4], [5]. Meanwhile, the sediments showed low organic matter content and fertility levels, but no metal toxicity [2].…”

Section: Introductionmentioning

confidence: 99%