6 documents found, page 1 of 1
Grupo da copiapite: modos de ocorrência e propriedades em ambientes de contamin...
Barroso, Ana; Valente, T.; Antunes, I. M.; Marinho Reis, A. PaulaO grupo copiapite apresentou uma ampla gama de composições químicas, permitindo a identificação de várias fases minerais (por exemplo, aluminocopiapite e magnesiocopiapite). Esses minerais, normalmente observados em ambientes mineiros, são formados a partir da precipitação e evaporação da drenagem ácida da mina. Nessas áreas, a copiapite tem sido estudada para compreender a sua capacidade de adsorção de alguns ...
Pegmatite fields of São Pedro de Ferros, Antônio Dias and Marilac, Minas Gerais...
Soares, D.; Silveira, G.; Castro, I.; Assis, I.; Leles, L.; Mancini, M.; Carlos, D.; Costa, Raphael Vicq Ferreira; Valente, T.; Leão, L.Pegmatites are rocks of granite or metastatic origin with gigantic crystals that are formed in fluid phase of the magmatic liquid enriched with incompatible elements, thats why they can be considered as gemstones and industrial minerals deposits. Both studied areas in the present article were genererated by anatexia process or partial fusion. The Jatobá Mine in the Pegmatitic Field of Ferros-Antônio Dias, in Sa...
Natural attenuation processes in AMD context by mineralogical control: iron oxy...
Barroso, Ana; Valente, T.; Antunes, I. M.; Marinho Reis, A. PaulaAcid mine drainage (AMD) is a common problem associated with the weathering of metal sulfide wastes in abandoned mining areas, which can be rich in toxic metals and metalloids. Oxidative dissolution of these minerals may negatively affect the soils and water reservoirs nearby. The formation of secondary mineral phases such as iron oxyhydroxides, oxyhydroxysulfates, and efflorescent sulfates may be a natural att...
Estudo geoambiental de resíduos de mineração de ouro em contexto de economia ci...
Lemos, Mariana Gazire; Valente, T.; Marinho Reis, A. Paula; Fonseca, R.[Excerto] Um dos grandes desafios atuais no ambito da mineracao no Brasil 6 o tratamento e a otimizacao dos recursos naturals. A necessidade de reducao de residuos enviados a barragens de rejeitos, associada as ditimas tragedias de Mariana e Brumadinho-MG, a crescents dificuldade de obtencao de licencas ambientais e locals adequados para a sua disposicao, sao fatores que promovem o processamento destes material...
Novel methodology based on biomimetic superhydrophobic substrates to immobilize...
Lima, A. C.; Batista, P.; Valente, T.; Silva, A. S.; Correia, I. J.; Mano, J. F.Cell-based therapies for regenerative medicine have been characterized by the low retention and integration of injected cells into host structures. Cell immobilization in hydrogels for target cell delivery has been developed to circumvent this issue. In this work mesenchymal stem cells isolated from Wistar rats bone marrow (rMSCs) were immobilized in alginate beads fabricated using an innovative approach involv...
Novel methodology based on biomimetic superhydrophobic substrates to immobilize...
Lima, A. C.; Batista, P.; Valente, T.; Silva, A. S.; Correia, I. J.; Mano, J. F.The low retention/integration of injected cells by host structures represents an important challenge in cell based therapies for regenerative medicine purposes. Cell immobilization in hydrogels for target cell delivery has been developed to circumvent this issue. However, the existing immobilization methodologies sometimes have several steps under wet conditions and present some drawbacks, including poor encaps...