WorldCat Identities

Rudolph, Martin

Overview
Works: 3 works in 3 publications in 1 language and 5 library holdings
Roles: Other, Opponent
Publication Timeline
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Most widely held works by Martin Rudolph
Interface Analyses Between a Case-Hardened Ingot Casting Steel and Carbon-Containing and Carbon-Free Refractories by Jens Fruhstorfer( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Optimization systems developed to improve the yield on tungsten and tantalum extraction and reduce associated costs - The EU HORIZON 2020 optimore project (grant no. 642201) by Josep Oliva Moncunill( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Récupération du tungstène à partir d'un skarn à faible contraste de séparation : apport de la modélisation moléculaire dans la flottation des minéraux calciques by Yann Foucaud( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

Nowadays, skarns represent more than 40% of the global resources in tungsten, which has been classified as a critical raw material in the European Union. In particular, the Tabuaço deposit constitutes an archetype of tungsten skarns and contains high amounts of calcium minerals, including fluorite, apatite, and vesuvianite, in close association with scheelite (CaWO4). According to their similar surface properties, the separation of these minerals by flotation with fatty acids is significantly difficult and, therefore, remains a scientific challenge. In this study, which has been conducted within the framework of the FAME H2020 European project, an economic, environment friendly, and transferable process has been developed for the Tabuaço ore to demonstrate the feasibility of the tungsten skarns processing. In the froth flotation process, the Na2CO3/Na2SiO3 system has exhibited the best efficiency in terms of gangue minerals depression due to considerable synergistic effects that have been subsequently described by statistical, spectroscopic, and atomistic methods. Meanwhile, the influence of the ratios between different carboxylic acids in the collector formulations (Tall Oil Fatty Acids) has been assessed to improve the flotation selectivity. In addition, the enhanced gravity separation (Falcon centrifuge concentrator) has been investigated, optimised, and combined with the flotation to produce a marketable scheelite concentrate assaying 63% WO3 with 59% recovery. Besides, to gain understanding in the molecular mechanisms involved in the flotation process, the fluorite and scheelite interfaces have been modelled using the density functional theory. This study has allowed to characterise the hydration state of these minerals, which display different affinities for water molecules. Furthermore, the adsorption of fatty acids on fluorite has been studied to unravel the adsorption mechanisms of these molecules on calcium minerals, confirmed by experimental investigations
 
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Audience level: 0.97 (from 0.96 for Récupéra ... to 0.97 for Optimizati ...)

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