Publication
Processamento de materiais termoelétricos baseados na tetraedrite usando minério de tetraedrite-tenantite
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Advisor(s)
Abstract(s)
RESUMO: O desenvolvimento e implementação de tecnologias com baixo potencial de aquecimento global e energeticamente eficientes requer uma contínua inovação na área dos materiais para a energia. Nesta estratégia insere-se a pesquisa sobre o processamento de materiais termoelétricos baseados na tetraedrite. No presente trabalho procede-se à avaliação da viabilidade da incorporação direta, sem qualquer pré-tratamento, de minério da série tetraedrite-tenantite no processamento de materiais à base de tetraedrite por síntese mecanoquímica. Para tal prepararam-se misturas de pós contendo diferentes rácios de amostras de tetraedrite sintética, também obtida por síntese mecanoquímica, e de amostras de minério, recolhidas na mina de Neves-Corvo e na escombreira da mina do Barrigão. A caraterização estrutural e microestrutural dos materiais processados após 1 h e 2 h de síntese mecanoquímica permitiu verificar a formação de um composto constituído por tetraedrite-tenantite-(Fe) como fase principal, independentemente do minério de origem. Estes resultados são uma indicação do sucesso da abordagem seguida.
ABSTRACT: The development and implementation of energy efficient technologies with low global warming potential requires a continuous innovation in the field of materials for energy. This strategy includes research on the processing of thermoelectric materials based on tetrahedrite. In the present work, it is evaluated the feasibility of the direct incorporation, without any pretreatment, of minerals from the tennantite-tetrahedrite series in the processing of tetrahedrite-based materials by mechanochemical synthesis. For this purpose, several powder mixtures were prepared containing different ratios of synthetic tetrahedrite samples, also obtained by mechanochemical synthesis, and of ore samples, collected at the Neves Corvo mine and at the abandoned Barrigão mine dumps. From the structural and microstructural characterization of the materials processed for 1 h and 2 h it was observed the formation of a tetrahedrite-tennantite-(Fe) compound, regardless of the origin of the ore sample. These results are an indication of the success of the approach followed.
ABSTRACT: The development and implementation of energy efficient technologies with low global warming potential requires a continuous innovation in the field of materials for energy. This strategy includes research on the processing of thermoelectric materials based on tetrahedrite. In the present work, it is evaluated the feasibility of the direct incorporation, without any pretreatment, of minerals from the tennantite-tetrahedrite series in the processing of tetrahedrite-based materials by mechanochemical synthesis. For this purpose, several powder mixtures were prepared containing different ratios of synthetic tetrahedrite samples, also obtained by mechanochemical synthesis, and of ore samples, collected at the Neves Corvo mine and at the abandoned Barrigão mine dumps. From the structural and microstructural characterization of the materials processed for 1 h and 2 h it was observed the formation of a tetrahedrite-tennantite-(Fe) compound, regardless of the origin of the ore sample. These results are an indication of the success of the approach followed.
Description
CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar
Keywords
Iberian Pyrite Belt (IPB) Tetrahedrite Mechanochemical synthesis Thermoelectric
Citation
Esperto, L... [et.al.] - Processamento de materiais termoelétricos baseados na tetraedrite usando minério de tetraedrite-tenantite. In: CIES2020: As Energias Renováveis na Transição Energética: Livro de Comunicações do XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar. Helder Gonçalves, Manuel Romero (Ed.). Lisboa, Portugal: LNEG, 3-5 Novembro, 2020, p. 781-787
Publisher
LNEG - Laboratório Nacional de Energia e Geologia