Microstructural, physical and mechanical behavior of pastes containing clays and alumina waste

Gonçalves, Wherllyson Patrício; Silva, Valmir J.; Menezes, Romualdo Rodrigues; Neves, G. A.; Lira, Hélio Lucena; Santana, Lisiane Navarro de Lima

doi:10.1016/j.clay.2016.12.026

Cited by 28 publications

(23 citation statements)

References 28 publications

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“…The presence of a small band in 2θ ranging from 15º to 25º can also be observed, principally at temperatures of 1200ºC, which is characteristic of the presence of amorphous material, i.e., vitreous phase due to excess SiO 2 , as reported in the literature 13,32,33 .…”

Section: Resultssupporting

confidence: 67%

Influence of Processing Variables on Clay-Based Ceramic Formulations

et al. 2019

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The properties of ceramic materials and microstructural changes are dependent on the raw materials from which they are made and on the manner in which they are processed, from the composition to the established thermal treatment, heating rate, and firing temperature. In this study, the influence of some processing parameters (formulation, maturation time, and firing temperature) on the physical-mechanical properties and microstructural aspects of ceramic pieces produced from natural aluminosilicates was investigated. Because Brazil does not have many quality ball clays reserves, bentonite was included as a plasticizing agent in this study. The formulations were submitted to maturation for a period of one to four weeks and their characteristics were determined to evaluate plasticity. Following this, the specimens were extruded and subjected to heat at temperatures of 1200, 1300, and 1400ºC. The physical-mechanical properties determined were: water absorption, linear retraction, and flexural strength. Statistical analysis was applied. The results showed that, for the analyzed masses, neither the maturation time nor the physical and mechanical properties analyzed had influence on plasticity. The firing temperature was the factor that generated the greatest alteration in results, increasing the mechanical resistance and altering the size and interlocking of the mullite needles.

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Section: Resultssupporting

confidence: 67%

Influence of Processing Variables on Clay-Based Ceramic Formulations

et al. 2019

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“…The values obtained were also corroborated in [23,58]. Comparing the values determined for the clays studied in [46,47,52], it was verified that the samples under study had values similar to those of kaolinite clays. Fig.…”

Section: Materials and Methodologysupporting

confidence: 69%

Characterization of clays from the State of Paraíba, Brazil for aesthetic and medicinal use

Buriti

Silva

et al. 2019

Cerâmica

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This study aimed to evaluate the potential of clays from the State of Paraíba to be used for medicinal, therapeutic and aesthetic treatments. The samples were characterized by X-ray diffraction, X-ray fluorescence chemical composition, thermogravimetry, differential thermal analysis, laser diffraction granulometric analysis, cation exchange capacity, and antimicrobial activity. Based on the study, it was concluded that the clays from the State of Paraíba had properties similar to those of commercial clay. The antimicrobial evaluation revealed that the samples showed no activity against the three bacterial strains of clinical interest: Staphylococcus epidermidis ATCC 12 228, Staphylococcus aureus ATCC 25 923, and Escherichia coli ATCC 25 922. Finally, it was concluded that the clays studied have the potential for technological applications in medicinal, therapeutic, and aesthetic treatments, and as raw material for obtaining biomaterials, due to their stability and biological safety.Este trabalho teve como objetivo avaliar a potencialidade das argilas do estado da Paraíba, visando suas aplicações em tratamentos medicinais, terapêuticos e estéticos. As amostras das argilas foram caracterizadas pelas técnicas de difração de raios X, composição química por fluorescência de raios X, termogravimetria, análise térmica diferencial, análise granulométrica por difração a laser, capacidade de troca catiônica e atividade antimicrobiana. Com base no estudo, concluiu-se que as argilas do estado da Paraíba apresentaram propriedades similares à argila comercial. A avaliação antimicrobiana revelou que as amostras não apresentaram atividade frente a três cepas bacterianas de interesse clínico: Staphylococcus epidermidis ATCC 12 228, Staphylococcus aureus ATCC 25 923 e Escherichia coli ATCC 25 922. Por fim conclui-se que as argilas estudadas possuem potencial tecnológico para aplicações em tratamentos medicinais, terapêuticos, estéticos e como matéria-prima para obtenção de biomateriais, em virtude da sua estabilidade e segurança biológica. Palavras-chave: argilas, biominerais, caracterização, tratamento medicinal.

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“…Binder content B/(T + S) � (M binder /(M tailings + M waste )) indicates the relation between cement and aggregates and also the capacity owned by the binder to enclose the aggregates and to make them stick together [34]. Figure 5 reveals the relationship between the 28-day UCS and the binder content.…”

Section: Relationship Between Ucs and The Binder Contentmentioning

confidence: 99%

A Novel Prediction Model of Strength of Paste Backfill Prepared from Waste-Unclassified Tailings

Zhang

2019

Advances in Materials Science and Engineering

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Paste backfilling is an important support for the development of green mines and deep mining. It can effectively reduce a series of risks of underground goaf and surface tailings ponds. Reasonable strength of backfill is an effective guarantee for controlling ground stress and realizing safe mining function. Under the combination of complex materials and local conditions, ensuring the optimal design and effective proportion for paste backfill strength is the bottleneck problem that restricts the safety, economy, and efficiency of filling mining. The strength developing trend of paste backfilling prepared from waste rock and unclassified tailings has been studied. Different levels of cement contents, tailings-waste ratios, and slurry concentrations were investigated through orthogonal design to obtain the relationship between the UCS and the multi-influential factors. Combined with the experimental results and the previous strength prediction models, the waste rock-unclassified tailings paste strength prediction model was proposed. Introducing the water-cement ratio, the cement-tailings ratio, the amount of cement, and the packing density that characterizing the overall gradation of unclassified tailings and waste rock, as well as the curing time, a strength prediction model of multifactors was developed. Moreover, the microscopic structure of the paste prepared from waste-unclassified tailings was analyzed with an Environment Scanning Electron Microscope (ESEM), and the influence mechanism was ascertained. The weight coefficient of strength development is carded in this paper, and the strength model of unclassified tailings-waste paste considering five factors is obtained, which is of great significance to guide the mining engineering.

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Microstructural, physical and mechanical behavior of pastes containing clays and alumina waste

Cited by 28 publications

References 28 publications

Influence of Processing Variables on Clay-Based Ceramic Formulations

Influence of Processing Variables on Clay-Based Ceramic Formulations

Characterization of clays from the State of Paraíba, Brazil for aesthetic and medicinal use

A Novel Prediction Model of Strength of Paste Backfill Prepared from Waste-Unclassified Tailings

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