Buscar
Mostrando ítems 61-70 de 397
Catalysts containing transition metals on nitrogen and carbon structures for hydrogen production through saltwater electrolysis
(The Electrochemical Society, 2021)
Análise da caracterização de catalisadores do tipo TWC visando recuperação de Pt, Rh e Pd
(Universidade Federal de São Paulo, 2022-12-13)
Os catalisadores automotivos compõem uma grande fração no mercado mundial de catalisadores químicos. Seu desenvolvimento está intrinsicamente vinculado a necessidade de se atender à legislação ambiental corrente, que ...
Tracking cobalt, REE and gold from a porphyry-type deposit by LA-ICP-MS: a geological approach towards metal-selective mining in tailings
(MDPI, 2020)
High-resolution mineral characterization performed on mine material from a giant porphyry copper deposit shows that critical and precious metals, such as cobalt, lanthanum, gold, silver, and tellurium, are concentrated in ...
Laser-induced breakdown spectroscopy (LIBS) for analysis of precious metals in minerals
(2017-09-15)
The use of LIBS to quantify naturally-occurring gold and silver was investigated with the purpose of exploring its future application as an in situ and online monitoring technique for the precious metal mining industry. ...
An overview of the reactivity guidelines of MN4 and MN2 molecular catalysts for fuel cells and air batteries
(2017)
One of the limitations of room and low temperature fuel cells is that they require expensive precious metal catalysts (PMC) especially for the O2 cathode, due to the low reactivity of O2 at ambient temperatures. Less costly ...
Icp-ms And Te Co-precipitation After Nickel Sulphide Fire-assay Collection For Pd Determination In Roadside Soils
(Springer Berlin Heidelberg, 2006)
Remote Sensing And Gis Prospectivity Mapping For Magmatic-hydrothermal Base- And Precious-metal Deposits In The Honghai District, China
(Pergamon-Elsevier Science LTDOxford, 2017)
Gold and silver cyanidation from a residue produced by leaching dead-roasted copper white metal
(2010)
The present work discusses the gold and silver recovery by cyanidation front I solid leach residue produced by a new alternative of processing copper matte or white metal. The leach residue contains mainly hematite, cupric ...
"Invisible" silver and gold in supergene digenite (Cu1.8S)
(PERGAMON-ELSEVIER SCIENCE, 2010-11-01)
Despite its potential economic and environmental importance, the study of trace metals in supergene (secondary) Cu-sulfides
has been seriously overlooked in the past decades. In this study, the concentration and mineralogical ...
Estudio de la separación de oro y plata de escorias
(2018-06-06)
RESUMEN: La importancia de los metales preciosos en la economía de las naciones juega
un papel relevante debido al incremento en los precios a consecuencia de las
crisis económicas. La obtención de metales preciosos no ...