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Estudo de viabilidade da substituição parcial do ligante (cimento) por filler no enchimento por paste fill no método sublevel stoping
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Abstract(s)
Esta dissertação foca-se no estudo da viabilidade da substituição parcial de ligante (cimento) por filler no enchimento por pastefill no método ‘Sublevel Stoping’ nas minas de Aljustrel, com o objetivo de reduzir os custos operacionais, assim como o impacto ambiental associado à produção de cimento. A relevância deste estudo advém da crescente procura da indústria mineira de soluções mais sustentáveis que mitiguem os efeitos da exploração subterrânea. Para tal, foram realizadas, no Laboratório Geotécnico da ALMINA – Minas do Alentejo, S.A, vinte misturas de pasta constituídas por rejeitado de cobre, cimento Portland tipo II/A-L 42.5R, filler, água e aditivo, com o intuito de avaliar o impacto da substituição parcial de cimento por filler nas propriedades reológicas e na resistência mecânica da pasta. Deste modo, realizaram-se vários ensaios laboratoriais, nomeadamente ensaios de abaixamento (slump), espalhamento e resistência à compressão uniaxial, que permitiram assegurar o controlo de qualidade da pasta. Os resultados demonstraram que apenas as seis últimas misturas, sobretudo as de 15%, 12% e de 10% de filler, cumprem os requisitos da pasta de enchimento, apresentando valores favoráveis de resistência mecânica aos 28 dias e uma trabalhabilidade adequada.
This dissertation focuses on studying the feasibility of partially replacing binder (cement) with filler in pastefill using the “Sublevel Stoping” method in the Aljustrel mines, with the aim of reducing operating costs as well as the environmental impact associated with cement production. The relevance of this study stems from the mining industry's growing demand for more sustainable solutions that mitigate the effects of underground mining. To this end, twenty mixtures of paste made up of copper tailings, Portland cement type II/A-L 42.5R, filler, water and additive were made at the Geotechnical Laboratory of ALMINA - Minas do Alentejo, S.A, in order to assess the impact of partially replacing cement with filler on the rheological properties and mechanical strength of the paste. Various laboratory tests were conducted, including slump, spreading, and uniaxial compressive strength tests, to ensure the quality control of the paste. The results showed that only the last six mixtures, especially those with 15%, 12% and 10% filler, met the requirements for a filler paste, with favourable mechanical strength values at 28 days and adequate workability.
This dissertation focuses on studying the feasibility of partially replacing binder (cement) with filler in pastefill using the “Sublevel Stoping” method in the Aljustrel mines, with the aim of reducing operating costs as well as the environmental impact associated with cement production. The relevance of this study stems from the mining industry's growing demand for more sustainable solutions that mitigate the effects of underground mining. To this end, twenty mixtures of paste made up of copper tailings, Portland cement type II/A-L 42.5R, filler, water and additive were made at the Geotechnical Laboratory of ALMINA - Minas do Alentejo, S.A, in order to assess the impact of partially replacing cement with filler on the rheological properties and mechanical strength of the paste. Various laboratory tests were conducted, including slump, spreading, and uniaxial compressive strength tests, to ensure the quality control of the paste. The results showed that only the last six mixtures, especially those with 15%, 12% and 10% filler, met the requirements for a filler paste, with favourable mechanical strength values at 28 days and adequate workability.
Description
Keywords
Pastefill filler mechanical resistance workability Pasta de enchimento Filler Resistência mecânica Trabalhabilidade