Impact-induced damage on foliated ore pass walls

CIM Journal, Vol. 5, No. 1, 2014
K. Esmaieli and J. Hadjigeorgiou
Lassonde Institute of Mining, University of Toronto, Toronto, Ontario, Canada
Nous avons effectué une série d’expériences numériques pour étudier l’influence de la foliation de la masse rocheuse sur le dommage aux parois des cheminées à minerai causé par des impacts. Le 2D Particle Flow Code [code numérique modélisant l’écoulement de matériel granulaire en deux dimensions] a été utilisé pour simuler trois masses rocheuses distinctes autour d’une cheminée à minerai caractérisée par des angles de foliation de 60°, 90° et 120° (sens horaire depuis l’horizontal). Nous avons ensuite projeté un fragment de roche contre les parois de la cheminée à une vitesse et à un angle d’impact constants. Le dommage résultant augmentait lorsque l’angle de l’intersection entre les parois de la cheminée à minerai et la foliation de la masse rocheuse diminuait.
Résumé Nous avons effectué une série d’expériences numériques pour étudier l’influence de la foliation de la masse rocheuse sur le dommage aux parois des cheminées à minerai causé par des impacts. Le 2D Particle Flow Code [code numérique modélisant l’écoulement de matériel granulaire en deux dimensions] a été utilisé pour simuler trois masses rocheuses distinctes autour d’une cheminée à minerai caractérisée par des angles de foliation de 60°, 90° et 120° (sens horaire depuis l’horizontal). Nous avons ensuite projeté un fragment de roche contre les parois de la cheminée à une vitesse et à un angle d’impact constants. Le dommage résultant augmentait lorsque l’angle de l’intersection entre les parois de la cheminée à minerai et la foliation de la masse rocheuse diminuait.
Accés complet à Document technique
Autres documents dans CIM Journal, Vol. 5, No. 1, 2014
Recherche
Trier par :  Pertinence
Affichage des résultats 1 - 8
Texte
Publication: CIM Journal
Numéro: 1
Volume: 5
Année: 2014
Texte
Sommaire: Wash water and polyethylene oxide (PEO) were used in the flotation of quartz and coal. Wash water decreased entrainment of –15 μm quartz. The optimum superficial wash water rate was 0.05 cm/s. PEO also lowered entrainment. The combination of wash water and PEO led to a slight further reduction in entrainment. For 1:1 mixtures of –15 μm quartz and –300 μm oxidized coal, the combined use of wash water (0.05 cm/s) and PEO increased the separation efficiency from approximately 30% to > 70%,...
Publication: CIM Journal
Auteur(s): H. Wang and M. Cao
J.-C. Sztuke and A. Stradling
Z. Xu and Q. Liu
Mots clés: Polyethylene oxide, Coal flotation, Quartz, Entrainment
Numéro: 1
Volume: 5
Année: 2014
Texte
Sommaire: A methodology based on a two-stage approach was developed for process technology selection. The first stage includes evaluation of available technologies, followed by shortlisting the best technologies based on mass and energy balance modelling, financial analysis, and risk analysis. The second stage involves detailed analysis using refined input data, mass and energy balance modelling, and capital and operating cost estimation, as well as a more detailed financial analysis. A case study...
Publication: CIM Journal
Auteur(s): Y. Gordon and S. Kumar
Mots clés: Blast furnace ironmaking, Alternative ironmaking technology, Melting, Direct reduced iron (DRI), Hot briquetted iron (HBI), Iron nugget, Pig iron (PI), Technology selection, Risk analysis, Financial analysis
Numéro: 1
Volume: 5
Année: 2014
Texte
Sommaire: The mining limit in oil sands is regulated by the ratio of total mining volume (ore, interburden, and overburden) one has to mine per volume of bitumen in place (TV/BIP). This paper presents a mathematical solution for creating the most economical pit outline where the TV/BIP ratio upper limit is 12, by combining mining economic theory and the Lerchs-Grossmann (LG) algorithm.
Publication: CIM Journal
Auteur(s): L. Chunpongtong
Mots clés: Total volume to bitumen in place (TV/BIP)*, Pit limit, Lerchs-Grossmann (LG), Oil sands
Numéro: 1
Volume: 5
Année: 2014
Texte
Sommaire: Understanding process histories and worker exposures in nickel production operations is critical in determining the role nickel compounds play in respiratory cancer incidence. As part of a series on Vale Canada’s (previously known as Inco) nickel processing operations, this paper includes descriptions of Ni electrolytic operations at refineries in Port Colborne, Ontario (1922–1984), and Thompson, Manitoba (1961–present). Industrial hygiene measurements, by area and personal sampling, of...
Publication: CIM Journal
Auteur(s): B. R. Conard
Mots clés: Inco, Nickel, Electrorefining, Electrowinning, Electrolyte purification, Inhalation exposure
Numéro: 1
Volume: 5
Année: 2014
Texte
Sommaire: This paper evaluates the potential of freeze-thaw dewatering using Albian mature fine tailings (MFT). Freezing tests were first performed to study the effect of freezing rate on dewatering efficiency. Lower freezing rate resulted in higher thawed solids content and shear strength. Subsequently, large strain consolidation tests were conducted to investigate consolidation behaviour and how it is affected by freeze-thaw. The consolidation behaviour was presented in terms of effective stress...
Publication: CIM Journal
Auteur(s): Y. Zhang, D. C. Sego
Mots clés: Freeze-thaw, Dewatering, Oil sands tailings, Mature fine tailings (MFT), Large strain consolidation
Numéro: 1
Volume: 5
Année: 2014
Texte
Sommaire: Concentrator plant design has evolved from large numbers of small grinding mills to small numbers of large mills. Consequently, plant performance often hinges on the productivity of a single large semi-autogenous grinding mill. Industry attempts to address the grinding mills’ critical
nature frequently result in specifications that can be made simpler, more economical, and better focused on the project’s goals. This paper surveys current specification writing practices and proposes an...
Publication: CIM Journal
Auteur(s): R. A. Nemchek
Mots clés: Semi-autogenous grinding (SAG) mill, Specification writing, Design, Quality
Numéro: 1
Volume: 5
Année: 2014
Texte
Sommaire: In this paper, we used data collected from the Gibraltar mine to analyze the effect of the TyreSense tire monitoring system on tire performance by reducing tire wear and preventing premature tire failure or damage. We analyzed the relationship between tire temperature, tire pressure, and tire failure or damage to help better understand the importance of controlling high tire temperature and pressure. The results enhance and expand the knowledge of the management of tire operational pressure...
Publication: CIM Journal
Auteur(s): J. Zhou, R. A. Hall, S. Klingmann
Mots clés: Tire monitoring, Pressure and temperature alerts, Damage prevention, Wear reduction
Numéro: 1
Volume: 5
Année: 2014
Activé par Coveo Enterprise Search