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- Processamento de materiais termoelétricos baseados na tetraedrite usando minério de tetraedrite-tenantitePublication . Esperto, Luís; Figueira, Isabel; Mascarenhas, João; Salgueiro, Rute; Silva, Teresa; Lopes, E.B.; Gonçalves, António Pereira; Correia, J.B.; de Oliveira, Daniel Pipa Soares; Almeida, P.; Neves, FilipeRESUMO: 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.
- START Newsletter: Recover-Reform-Reuse for a Sustainable Future, Issue 2Publication . Neves, Filipe; Vicenzi, BrunoABSTRACT: Welcome to the second issue of the START project Newsletter! In this issue, we will share with you some highlights from our recent events and activities, and you will learn more about START with STARTY, our friendly robot that helps us explain the project scope. In addition, we have two technical pills for you: one related to the geology of tetrahedrites (the main mineral used in START) and another describing the use of powder technology for processing tetrahedrites into high-performance thermoelectric materials. Finally, we will take you on a tour around two of our consortium partners: TEGnology (from Denmark) and RGS Development (from the Netherlands), both small enterprises that develop innovative thermoelectric solutions for different sectors.
- Recursos locais para aplicações multifuncionais de captação de energia com base em tetraedritePublication . Neves, Filipe; Esperto, Luís; Figueira, Isabel; Mascarenhas, João; Correia, J.B.; Joyce, A; Guimarães, Fernanda; Salgueiro, Rute; Silva, Teresa; de Oliveira, Daniel Pipa Soares; Lopes, E.B.; Gonçalves, António Pereira; Centeno, Pedro; Mendes, M.J.; Águas, H.; Martins, Rodrigo; Gil, Luís; Almeida, PatríciaRESUMO: Este trabalho descreve as principais linhas de investigação que estão em curso no âmbito do projeto LocalEnergy (http://localenergy.lneg.pt). LocalEnergy é um projeto multidisciplinar de Investigação, Desenvolvimento e Inovação (I&D&I), envolvendo atividades no domínio da ciência dos materiais, da geologia e das energias renováveis. Essas atividades estão orientadas para a indústria e assentam numa abordagem disruptiva visando o desenvolvimento de materiais termoelétricos, através da utilização de materiais à base de tetraedrites naturais e sintéticas, e o desenvolvimento de novos absorsores para células solares de filmes finos, usando materiais à base de tetraedrites sintéticas. Considerando que Portugal é um dos países europeus com maior nível de irradiação de energia solar e que a tetraedrite é um recurso mineral local, presente na Zona Sul Portuguesa da Faixa Piritosa Ibérica, o projeto LocalEnergy representa uma oportunidade para o desenvolvimento de sistemas energéticos sustentáveis baseados na maximização e exploração de dois importantes recursos endógenos (energia solar e recursos minerais).
- Starty explains START: Issue 2Publication . Neves, Filipe; Mascarenhas, JoãoABSTRACT: Learn more about START with the second multilingual issue of Starty, our friendly robot that helps us explain the project scope! In this issue, Starty addresses topics such as the link between raw materials and the energy transition and also presents the countries where the tetrahedrite mineral is collected for its incorporation in the production process of thermoelectric materials within the scope of the START activities.
- Natural alternatives for thermoelectric materials [Resumo]Publication . Santos, Beatriz; Lopes, E.B.; Neves, Filipe; Gonçalves, António Pereira
- Starty explains START: Issue 1Publication . Neves, Filipe; Mascarenhas, JoãoABSTRACT: Multilingual edition of the first storyboard with Starty, as main character. Starty is a friendly robot who loves to explore and learn new things, he loves the environment and the planet, is at ease with mines and excavators, and likes to spare energy and resources! In this first issue, Starty explains the concept of the START project in an readily comprehensible way.
- The START Project: Creating a sustainable supply chain for green energy harvesting products by Powder MetallurgyPublication . Neves, Filipe; Vicenzi, Bruno; Bianchi, Alvise; Rosinski, M.ABSTRACT: Sustainable Energy Harvesting Systems Based on Innovative Mine Waste Recycling (START) is an Innovation Action project co-funded by the EU and its Horizon Europe programme. Using an advanced powder production and consolidation process, the project’s aim is to create a sustainable supply chain for green energy harvesting products by transforming sulphide materials from mining waste into sustainable high-added-value Powder Metallurgy components for tellurium-free thermoelectric (TE) devices. Here, the consortium members offer a comprehensive summary of START’s background, the innovative workflow developed, and its potential impact.
- Thermoelectric Properties of Tetrahedrites Produced from Mixtures of Natural and Synthetic MaterialsPublication . Santos, Beatriz; Esperto, Luís; Figueira Vasques, Isabel; Mascarenhas, João; Lopes, E.B.; Salgueiro, Rute; Silva, Teresa; Correia, Jose B.; de Oliveira, Daniel Pipa Soares; Pereira Gonçalves, Antonio; Neves, FilipeABSTRACT: Thermoelectric materials have considerable potential in the mitigation of the global energy crisis, through their ability to convert heat into electricity. This study aims to valorize natural resources, and potentially reduce production costs, by incorporating tetrahedrite-tennantite (td) ores from the Portuguese Iberian Pyrite Belt into synthetic samples. The ore samples were collected in a mine waste at Barrig & atilde;o and as "dirty-copper" pockets of ore from the Neves Corvo mine. Subsequently, high-energy ball milling and hot pressing were employed in the production of thermoelectric materials. These are characterized by XRD, SEM/EDS, and thermoelectrical properties. The complete dissolution of the dump material sulfides with the synthetic tetrahedrite constituents led to an increase in the amount of the tetrahedrite-tennantite phase, which was made up of a tetrahedrite-tennantite-(Fe) solid solution. The thermoelectric characterization of these materials is provided, revealing that most of the combined synthetic ore samples displayed better results than the pristine tetrahedrite, mostly due to higher Seebeck coefficient values. Furthermore, the best thermoelectric performance is achieved with 10% of ore, where a power factor of 268 mu W.K-2.m-1 is reached at room temperature.
- The START project: Transforming mining waste into waste heat recovery materialsPublication . Neves, Filipe; Vicenzi, BrunoABSTRACT: The START project aims to produce thermoelectric devices for waste heat recovery applications from secondary mineral resources (mining waste).