Caracterização Dos Parâmetros De Porosidade De Concentrados De Minérios De Ferro Pelo Método De Adsorção De Nitrogênio

Pena, Eloisio Queiroz; Vieira, Cláudio Batista; Silva, Carlos Antônio da; Seshadri, Varadarajan; Araújo, Fernando Gabriel da Silva

doi:10.4322/tmm.00404010

Cited by 4 publications

(4 citation statements)

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“…type, indicative of nonrigid aggregates of lamellar particles, mainly mesopores/macropores in the form of slits or parallel plates [64,65]. Table 2 presents the specific surface area and porosimetry, and it is possible to observe that all of the samples are similar regarding the pore volume and diameter values.…”

Section: Iot Sample Characterization and Analysismentioning

confidence: 93%

“…According to IUPAC (International Union of Pure and Applied Chemistry), these curves are characteristics of nonporous or macroporous materials [63]. It is possible to see the presence of narrow and inclined hysteresis, classified as H3 type, indicative of nonrigid aggregates of lamellar particles, mainly mesopores/macropores in the form of slits or parallel plates [64,65]. Table 2 presents the specific surface area and porosimetry, and it is possible to observe that all of the samples are similar regarding the pore volume and diameter values.…”

Section: Iot Sample Characterization and Analysismentioning

confidence: 99%

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Characterization and Analysis of Iron Ore Tailings Sediments and Their Possible Applications in Earthen Construction

Bessa,

Duarte,

Lage

et al. 2024

Buildings

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Mineral extraction is of ultimate importance for the economies of different countries, and Brazil is one of the world’s leading producers of iron ores. Unfortunately, dams are still the main problem, mainly in Minas Gerais, especially after the Fundão Dam rupture in 2015. Additionally, there is still a massive presence of buildings built on earth throughout the Minas Gerais mining region, built from the 18th century to today. Investigating the potential of iron ore tailings (IOT) to be incorporated into traditional earthen construction techniques in regions affected by dam ruptures presents a relevant and innovative research approach. In addition, the local reuse of these sediments should be the priority. Thus, the main objective of this work was to collect, characterize, and analyze the possibilities of the application of these tailings to produce rammed earth (RE). A complete characterization analysis was performed on the samples collected at three points. To analyze the soil-IOT compatibility, representative mixtures of RE were produced, and the specific mass, compaction, and compressive strength were performed. It was observed that the IOT samples have a high silica content and that the mixtures of IOT–soil, even without cement, reached the compressive strength values of the international standards, or even above them.

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Section: Iot Sample Characterization and Analysismentioning

confidence: 93%

Section: Iot Sample Characterization and Analysismentioning

confidence: 99%

Characterization and Analysis of Iron Ore Tailings Sediments and Their Possible Applications in Earthen Construction

Bessa,

Duarte,

Lage

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

“…According to IUPAC (International Union of Pure and Applied Chemistry), these curves are characteristics of non-porous or macroporous materials [64]. It is possible to see the presence of narrow and inclined hysteresis, classified as H3 type, indicative of non-rigid aggregates of lamellar particles, mainly mesopores/macropores in the form of slits or parallel plates [65,66]. Table 2 presents the specific surface area and porosimetry and it is possible to observe all the samples are similar regarding the pore volume and diameter values.…”

Section: Iot Samples Characterization and Analysismentioning

confidence: 99%

Characterization and Analysis of Iron Ore Tailings Sediments and Application Possibilities in Earthen Construction

Bessa,

Duarte,

Lage

et al. 2023

Preprint

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Mineral extraction is one of the most important for the economies of different countries, and Brazil is one of the world's primary iron ore producers. Unfortunately, the dams are still the main problem, mainly in Minas Gerais, especially after the Fundão Dam rupture happened in 2015. Additionally, there is still a massive presence of buildings produced on earth throughout the Minas Gerais mining region, built from the 18th century to today. Investigating the potential of IOT to be incorporated into traditional earthen construction techniques in regions affected by dam ruptures presents a relevant and innovative research approach. In addition, the local reuse of these sediments should be the priority. Thus, the main objective of this work was to collect, characterize, and analyze the possibilities of application of these tailings to produce RE. XRD, XRF, granulometry, porosity, specific density, toxicity, and MEV/EDS were performed on the samples collected at three points. To analyze the soil-IOT compatibility, representative mixtures of RE were produced, and the specific mass, compaction, and compressive strength were performed. It was observed that the IoT samples have a high silica content and that the mixtures of IOT-soil, even without cement, reached compressive strength values above the current international standards.

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“…Until now, this model has been based on a systematic geological mapping of the deposits, information derived from geological descriptions of drill cores and results of chemical, physical and mineralogical analyses of samples generated by the exploration work, apart from the results of the technological testing after Costa, Rocha, Bonfioli and Vieira (1) . However, due to the various geological settings, even samples that are mineralogically similar can present variation of porosity parameters, after Pena (2) . Variations of characteristics relative to total volume, dimension, shape and degree of pore connectivity can generate significant behavior alterations in the phases of the concentration processes.…”

Section: Introductionmentioning

confidence: 99%

Métodos Analíticos Usados Na Determinação De Porosidade De Amostras De Minério De Ferro Da Samarco

Almeida,

Brandão

2009

ABM Proceedings

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In order to investigate the porosity in the ores that feed the Samarco Concentrator and their process products and to compare the porosimetry methods, four iron ore samples from Alegria Mine (Mariana, MG) were submitted to different porosimetry methods. The methods used were nitrogen adsorption-condensation porosimetry (NACP) and mercury intrusion porosimetry (MIP) with the support of scanning electron microscopy (SEM). The total pore volume and the pore size distribution have been determined by means of NACP, using the BJH model, and by MIP. Porosity qualitative analyses were carried out using SEM. The specific surface area (SSA) was measured by the BET method (nitrogen adsorption), as well. The mineral and microstructure compositions were carried out by reflected light microscopy and SEM with the support of microanalysis by energy-dispersive spectrometry (EDS). In the superposition range between the two porosimetry methods (NACP and MIP) -from 3nm to 100nm -the results were consistent but not identical. Below the detection boundary of gas adsorption (100nm), the NACP was more effective in distinguishing the samples than MIP. This was due to the microporosity shown by one of the samples. For the pore sizes from 50nm or more, SEM yielded qualitative results consistent with MIP for the samples studied.

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Caracterização Dos Parâmetros De Porosidade De Concentrados De Minérios De Ferro Pelo Método De Adsorção De Nitrogênio

Cited by 4 publications

References 1 publication

Characterization and Analysis of Iron Ore Tailings Sediments and Their Possible Applications in Earthen Construction

Characterization and Analysis of Iron Ore Tailings Sediments and Their Possible Applications in Earthen Construction

Characterization and Analysis of Iron Ore Tailings Sediments and Application Possibilities in Earthen Construction

Métodos Analíticos Usados Na Determinação De Porosidade De Amostras De Minério De Ferro Da Samarco

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