High temperature phase evolution of Bolivian kaolinitic–illitic clays heated to 1250°C

Escalera, Edwin; Tegman, Ragnar; Antti, Marta‐Lena; Odén, Magnus

doi:10.1016/j.clay.2014.07.024

Cited by 48 publications

(32 citation statements)

References 35 publications

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“…Características particulares das argilas, tais como estrutura e composição química, resultam em excelente capacidade de adsorção que é um dos fatores que explica sua extensa aplicação industrial, tecnológica, agrícola e ambiental [3,4].…”

Section: Introductionunclassified

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

et al. 2018

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ResumoOs cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) encontram-se em primeiro lugar no plano de seletividade para a obtenção de bentonitas monocatiônicas a partir das policatiônicas, influenciando de forma específica o comportamento reológico dos fluidos de perfuração base água. O objetivo deste trabalho foi estudar a influência do Li + , Na + e K + na reologia de bentonitas do estado da Paraíba, Brasil, para uso em fluidos de perfuração à base de água. Os novos depósitos de bentonitas brasileiras foram comparados com base nas suas características químicas, físicas, mineralógicas, propriedades reológicas e de filtração. As amostras de bentonitas foram caracterizadas por meio da composição química através do método clássico, capacidade de troca de cátions, análise granulométrica por difração a laser, difração de raios X e análises térmicas. A reologia das dispersões foi estudada e determinadas as viscosidades aparente, viscosidade plástica e limite de escoamento com base nas normas da API e Petrobras, além dos estudos de inchamento em água e filtrado. Os resultados mostraram uma melhora significativa nas propriedades reológicas e de filtração das dispersões após a aditivação com os carbonatos de lítio e de sódio, nessa ordem, havendo presença de tixotropia nas curvas de fluxo das dispersões de argilas estudadas. Palavras-chave: bentonitas, carbonatos alcalinos, fluidos de perfuração. Abstract

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Section: Introductionunclassified

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

et al. 2018

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“…In particular, illito-kaolinitic clay has shown appropriate properties for building ceramic [12]. us, the suitability of di erent clays in di erent applications is strongly dependent on its mineralogical and chemical composition.…”

Section: Characterization Of Clay Fractionsmentioning

confidence: 99%

“…Moreover, a careful calcination may activate the material resulting in the rising of clay reactivity and improving the mechanical performance of the final product obtained [13]. In spite of that, firing to higher temperatures results in the formation of new unreactive phases such as mullite [12] that can influence the geopolymer characteristics. In this context, the range of calcinations temperature varies from one author to another.…”

Section: Introductionmentioning

confidence: 99%

“…Metakaolin was made by controlled calcination. e process of thermal dehydroxylation breaks down the kaolin, for example, into metastable state (in terms of alumina environment) and quite disordered with the aim of improving their properties [12]. Indeed, the expulsion of OH − group from octahedral structure of kaolinite and the increase in disorder amplified the reactivity of metakaolin and promoted better characteristics of geopolymer products [13].…”

Section: Introductionmentioning

confidence: 99%

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Physicochemical Characterization of Geopolymer Binders and Foams Made from Tunisian Clay

Messaoud

Hamdi

Srasra³

2018

Advances in Materials Science and Engineering

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Illito-kaolinitic clay rich in hematite from south Tunisia was investigated in view of producing geopolymer materials. Geopolymers with two different densities were elaborated: cement and foam. e effects of activator concentrations on compressive strength, water absorption (durability), open porosity, and bulk density of geopolymers cement were examined, in order to assure optimal geopolymerization conditions. Geopolymer cements aged 28 days with optimum performances were achieved for 13 M of alkaline solution concentration. At these conditions, the compressive strength of prepared geopolymer reaches 27.8 MPa. e addition of silica fume to reactant geopolymer mixture induces modification of geopolymer density and decrease in the compressive strength of the final product. Geopolymer materials based on calcined Tunisian clay can be suggested as sustainable and cost-effective cement that may be applied to alternate Portland cement in many construction applications.

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“…Identification was more obvious at higher temperatures. Crystallization of hematite after calcination of natural clayey material has already been reported in literature [77,78].…”

Section: Resultsmentioning

confidence: 91%

Ability of Two Dam Fine-Grained Sediments to be Used in Cement Industry as Raw Material for Clinker Production and as Pozzolanic Additional Constituent of Portland-Composite Cement

Faure

Smith

Coudray

et al. 2017

Waste Biomass Valor

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other one is calcined in the range 550-1000 °C aiming to obtain a pozzolanic reactive material that could be used as supplementary cementitious material in blended Portland cement. After thermal treatments, the products are characterized and compared to ordinary Portland cement (OPC) and to pozzolanic active materials (fly ash from pulverized-coal power plant). Results showed that each sediment is suitable for the only tested reuse option. For the clinker prepared with SEP sediment, the morphology and the mineralogical composition correspond to those of a typical Portland clinker. Concerning calcined STA pozzolanic activity, the optimum thermal treatment was found to be 900 °C using the chemical Frattini test. Similar compressive strength results were obtained with calcined STA and silico-aluminous fly ash.Abstract Fine-grained sediment deposition is a phenomenon that occurs at different extents in all the reservoirs. This particle accumulation has to be properly managed, in accordance with the operational needs and the environment. As an extracted and on-land managed sediment has to be considered as a waste material according to both European and French regulations, sustainable reuse options need to be investigated. One of them could be a beneficial reuse as a raw material in cement industry either as partial substitution in Portland clinker raw mix or as a supplementary cementitious material (SCM) after thermal treatment in order to activate its possible pozzolanic activity. Two dredged materials, labelled SEP and STA, both from French hydroelectric reservoirs, are characterized on physical, chemical and mineralogical aspects. SEP is used as raw material partial replacement for clinker synthesis and the The original version of this article was revised due to a retrospective Open Access order.

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High temperature phase evolution of Bolivian kaolinitic–illitic clays heated to 1250°C

Cited by 48 publications

References 35 publications

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

Physicochemical Characterization of Geopolymer Binders and Foams Made from Tunisian Clay

Ability of Two Dam Fine-Grained Sediments to be Used in Cement Industry as Raw Material for Clinker Production and as Pozzolanic Additional Constituent of Portland-Composite Cement

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