ORBi Open Repository and Bibliography
In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision).
This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.
Mineralogy of fine particles in slurry from multispectral imaging - Leroy, Sophie; Dislaire, Godefroid; Barnabé, Pierre; Pirard, Eric
Quantitative mineralogy of fine particles in slurry from multispectral imaging
Sophie Leroy, Godefroid Dislaire, Pierre Barnabé and Eric Pirard
Mineral processing especially in its final stages relies heavily on the differential behavior of particles in pulps. In order to monitor hydrocyclones and flotation cells in almost real time, it is important to develop at line particle characterization providing information on particle distribution but also mineralogy. A sampling device has been elaborated based on a flow cell with variable wall spacing linked to a high pressure peristaltic pump. This setup allows for dispersion and dilution of the mineral slurry into the cell. Depending...
Computational homogenization of cellular materials with propagation of instabilities through the scales - Nguyen, Van Dung; Noels, Ludovic
The aim of this work is to develop an efficient multi–scale finite element framework to capture the buckling instabilities in cellular materials.
As a classical multi–scale computational homogenization scheme looses accuracy with the apparition of the macroscopic localizations resulting from the micro–buckling, the second–order
multi–scale computational homogenization scheme1 is considered. This second–order computational framework is herein enhanced with the following novelties so that it can be used for cellular materials.
First, at the microscopic scale, the periodic boundary condition is used because of its efficiency.
As the meshes generated from cellular materials exhibit a large void part on the boundaries and are not conforming...
Multiscale Finite Element Modeling of Nonlinear Quasistatic Electromagnetic Problems - Niyonzima, Innocent
The effective use of composite materials in the technology industry requires the development of accurate models. Typical such materials in electrotechnical applications are lamination stacks and soft magnetic composites, used in the so-called magnetoquasistatic (low frequency) regime.
Current homogenization models (e.g. the classical homogenization method, mean field homogenization, ...) fail to handle all the difficulties raised by the modeling of these materials, particularly taking into account the complexity of their microstructure and their nonlinear/hysteretic behaviour. In this thesis we develop a multiscale computational method which allows to effectively solve multiscale magnetoquasistatic problems.
The technique is inspired by the HMM (heterogeneous multiscale method),...
Imaging and understanding of iron ore granulation using X-ray mictrotomography - Evrard, Maxime; Contreras, Rafael; Pirard, Eric
Imaging and understanding of iron ore granulation using X-ray microtomography.
Evrard M., Contreras R., Pirard E.
Most iron ores cannot be directly fed into blast furnaces because their particle size distribution will negatively impact the blast furnace permeability and hence the overall efficiency of the ore reduction process. The finest fraction (typ. < 6.3 mm) has to undergo a sintering process, wherein a mixture of iron ore, coke and flux (limestone, olivine,…) is heated, partially molten and transformed into pieces of sintered material with adequate size, porosity and strength characteristics to be fed into the blast furnace. The preparation of an adequate...
Is Geometallurgy Teachable? A challenge for the new Erasmus Mundus EMerald - Pirard, Eric
designate any kind of advanced ore characterisation prior to mineral processing operations while in fact it should clearly refer to a multidisciplinary integration of geological, mining, metallurgical, environmental and economic information into a single orebody model.
In order to instil the best available geometallurgical practices in the professional world, it seems essential to break the traditional cleavages among disciplines and educate a new generation of engineers. The Erasmus Mundus EMerald “Master in Georesources Engineering” program initiated by four European universities under the coordination of University of Liege, has been designed to exactly tackle this challenge. It is not surprising that this...
From geometallurgy to ecometallurgy:Building mines for the future - Pirard, Eric
geometallurgy will become the central pivot of a successful mining operation.
Recently, Europe has awakened from a long period of lethargy in the raw materials sector. A series of important initiatives inspired by the European Innovation Partnership (EIP) have paved the way for more intense cooperation between industry, research centres and universities. Among these, the establishment of a Knowledge Innovation Community (KIC) in 2015 will definitely boost innovation and education in the sector. Interestingly, EIP addresses the whole value chain and considers mining, recycling and substitution as essential pillars of the raw materials policy.
This vision strengthens the role of geometallurgy but...
Assessing the operation rules of a reservoir system based on a detailed modelling-chain - Bruwier, Martin; Erpicum, Sébastien; Pirotton, Michel; Archambeau, Pierre; Dewals, Benjamin
According to available climate change scenarios for Belgium, drier summers and wetter winters are expected. In this study, we focus on two muti-purpose reservoirs located in the Vesdre catchment, which is part of the Meuse basin. The current operation rules of the reservoirs are first analysed. Next, the impacts of two climate change scenarios are assessed and enhanced operation rules are proposed to mitigate these impacts. For this purpose, an integrated model of the catchment was used. It includes a hydrological model, one-dimensional and two-dimensional hydraulic models of the river and its main tributaries, a model of the reservoir system...