Abstract: Etude generale de l'influence de la morphologie, de la mineralogie et la composition chimique de surface sur la flottation des particules minerales fines

Abstract: A concentrate containing 63% iron can be obtained from tailings containing 34% iron with around 60% recovery. Caustic degraded tapioca starch is an effective agent for selective flocculation. While ...

Abstract: The effectiveness of a freeze-conditioning agent depends strongly on the coal substrate. In general, the greater the porosity of the coal, the smaller the effect of the freeze conditioning agent. Coal porosity has a greater impact on water-soluble agents than on oil-based products. The authors investigated the pore structure of a variety of coals using mercury intrusion. Findings were related to the effectiveness of freeze-conditioning agents as measured by unconfined compressive strength tests. In general, coals with a large number of very small pores do not respond well to freeze-conditioning chemicals.

Abstract: Presentation d'une analyse des investissements dans un projet d'exploitation miniere du point de vue de leur optimisation financiere. Demonstration de l'existence de duree de vie optimale de l'exploitation pouvant etre determinee moyennant certaines simplifications. Presentation de tables facilitant le calcul de la duree de vie optimale

Abstract: Utilisation d'un simulateur digital de circuits de classification et de broyage pour evaluer les performances de differents rheogrammes. Proposition d'exemples de calcul pour la conception de circuits de broyage par voie humide et par voie seche. Evaluation et discussion des performances de differentes configurations de circuits de broyage de clinker de ciment et de minerais sulfures

Abstract: Repartition des installations mobiles de concassage dans les exploitations a ciel ouvert par capacites types de concasseurs et materiaux traites. Raisons de l'adoption de ces installations. Types divers d'installations utilises

Abstract: The paper presents a discussion of coal oxidation. The potential effects of coal storage on coal characteristics are considered, and guidelines are given for the safe storage and bulk transfer of coal.

Abstract: Description d'echantillonneurs pression/vide d'eau du sol et de leurs techniques d'installation. Exemple d'utilisation pour la direction de fuites dans des bassins de decantation de residus de traitement de minerai d'uranium et dans le controle d'installations de lixiviation en tas de minerais d'or

Abstract: Growing interest in pit crushing and conveying is evident from the recent many articles, technical papers, and new equipment development. Application of a pit crushing and conveying system is complex. Many factors, such as mine design, production scheduling, as well as initial and ongoing capital and operating costs must be thoroughly and realistically examined. This paper addresses the fundamentals to be considered and reviews several approaches to developing a total system for a new and existing mine situation. The planning function is outlined and operating and design criteria defined to interface the mining operation and the pit crushing conveying system.

Abstract: The oil shales located in the Appalachian Basin cover an eight-state area of the eastern US and are referred to as Devonian (black) shales. These shales have been exploited for their gas potential for several years. The Institute of Gas Technology (IGT) has conducted research since 1972 on the production of shale oil from the Devonian shales. This resulted in the development of the HYTORT process. This process demonstrated that the yield from the Eastern oil shales can be greater than the value indicated by the Fischer assay method. IGT estimates that 67 Gm/sup 3/ (423 billion bbl) of oil could be recovered by HYTORT processing of surface minable eastern US shales. Recently, American Syncrude Corp. and Southern Pacific Petroleum NL have proposed oil shale projects in Kentucky. This paper will describe the surface mining and retorting techniques that have been studied for exploitation of the Devonian shales, and enumerate the problems that have to be overcome before commercial production can be realized.