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Traitement Et Valorisation De Rejets Miniers
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Book Synopsis Traitement Et Valorisation de Rejets Miniers by : Yassine Darmane
Download or read book Traitement Et Valorisation de Rejets Miniers written by Yassine Darmane and published by Omniscriptum. This book was released on 2010-10 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail porte sur la valorisation de déchets miniers provenant de deux gisements de natures et de régions différentes: gisement de pyrolusite d'Imini et les terrils des charbonnages de Jerada. Lors de cette étude, différentes techniques et procédés minéralurgique ont été utilisées. L'hydrométallurgie est la première technique appliquée au gisement de pyrolusite où un échantillon représentatif contenant 55% en MnO2 a été lixivié en milieu acide. Cette opération s'est déroulée à 70°C avec un rapport S/L de 90g/l. Ces conditions ont permis d'atteindre un taux de lixiviation de 98% en Mn(II). La solution est conditionnée à un pH 5 avant d'ajouter le NaClO qui oxyde le Mn(II) en différentes phases. Ces oxydes ont subi une dismutation par le HNO3 pour aboutir enfin à la variété α-MnO2 avec une pureté de 97%.Par ailleurs, les terrils abandonnés de l'ancienne mine de charbon de Jerada ont fortement évolué, en particulier la pyrite contenue s'est oxydée. Les opérations suivantes: criblage, élutriation et flottation ont permis d'obtenir un produit marchand qui titre 35% en oxyde de fer utilisable en peinture, émaillage et bioconstruction.
Book Synopsis Valorisation de rejets miniers talqueux par voie physico-chimique (flottation) by : Mehdi Irannajad Bisafar
Download or read book Valorisation de rejets miniers talqueux par voie physico-chimique (flottation) written by Mehdi Irannajad Bisafar and published by . This book was released on 1998 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: La présente recherche à pour objectif de mettre en valeur des rejets talqueux en cherchant leur reclassement dans des qualités nobles en se focalisant sur la séparation talc-carbonate-sulfure. Vu l'hydrophobie naturelle du talc, la méthode mise en œuvre est la flottation. La flottation répond aux conditions d'épuration. Les tests primaires conduisent à définir un essai de base à partir duquel les principaux paramètres pouvant influencer la qualité du flotté final ont été étudiés. Une étude de formulation de la blancheur est entreprise. Bien que présentant minéralogiquement une corrélation positive avec la teneur en talc, la blancheur des concentrés au delà d'un certain seuil de teneur ne vérifie plus cette corrélation. Parmi les paramètres prépondérants agissant sur la blancheur (W) des produits issus de ces rejets après traitement physico-chimique, on peut citer le mode du broyage. Il est le paramètre qui influence le plus la blancheur. La valeur de blancheur désirée de 88 n'a pu être atteinte qu'après un broyage à sec, Forplex à chocs. Lorsque les mêmes procédures de broyage et la flottation sont appliquées sur les produits commerciaux, confirmant l'effet de broyage, les valeurs de blancheur supérieures à 93 ont été obtenues. Des études, portant sur les qualités superficielles par IR et ATVC, sur l'hétérogénéité des surfaces par volumétrie d'adsorption de gaz, sur les paramètres structuraux par DRX, et sur les paramètres morphologiques par la géométrie fractale au travers de l'analyse d'images, ont été réalisées pour apporter des éléments de réponse à ces phénomènes. Le salissage des surfaces par des phases carbonatées induit une corrélation inverse par rapport à la blancheur. Cependant il ne peut pas être le seul responsable de la totalité de l'importante différence de la blancheur, W > 3% BaSO4, induite par les différents modes de broyage. Les variations d'homogénéité des faces latérales vont dans le même sens que les variations de blancheur. La morphologie des particules caractérisée par la dimension fractale montre une corrélation inverse entre la blancheur et les aspérités des particules.
Book Synopsis Valorisation Des Rejets Miniers À Faible Teneur en Sulfures Comme Granulats Pour Mortiers by : Rabei Argane
Download or read book Valorisation Des Rejets Miniers À Faible Teneur en Sulfures Comme Granulats Pour Mortiers written by Rabei Argane and published by . This book was released on with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mine tailings represent the finely ground industrial by products generated throw beneficiation of ore minerals. During mine exploitation, these tailings are generally transported in slurry form to large storage facilities, called tailings ponds or impoundments. These facilities are, in most cases, difficult to manage and expensive to rehabilitate. They are responsible for the generation of important environmental impacts and significant ecological disruptions, depending on their pollution potential, management technique, physical stability and the climate conditions. In this context, numerous studies have been conducted to develop new techniques for a sustainable management of mine tailings. The feasibility of reusing some tailings in the construction sector as cementing materials and additives for mortars or concretes were successfully achieved. However, the majority of the conducted studies are still at laboratory stages. Moreover the reuse of tailings as construction material is yet subject of numerous difficulties in term of social acceptance. Various parameters are also of concern, especially the physical and chemical stability of tailings as well as their eco-compatibility. In parallel, the uncontrolled reuse of low sulfide tailings as construction material is increasing in some developing countries (e.g. Morocco). In fact, nearby some abandoned mine sites, these tailings are considered as natural sands and are used for the manufacture of surface finishing mortars. This traditional recycling may constitute mechanical and environmental risks, principally related to tailings mechanical unconformity and to their non-negligible residual metal concentrations. Therefore, the aim of the current research is to evaluate the actual impact of two Moroccan mine tailings (named Zeida and Mibladen), commonly used as aggregates in the Upper-Moulouya region, on the mechanical properties of mortars and on their long term environmental behavior. This work has also as specific aim, to study the technical feasibility of using low sulfide tailings as sand substitute for the manufacture of rendering and masonry mortars. To attain this aim, a thorough characterization of the physical, chemical and mineralogical properties as well as the geochemical behavior of mine tailings was carried out. Mechanical properties of tailings-based mortars were then measured and compared to reference samples (sand-based mortars) using different tests such as setting time, entrained air volume and compressive strength. In parallel, mortars durability and hydration products were evaluated by mean of durability tests (wetting drying cycles, sulfate attack and acid rain simulation) and analytical methods (scanning electron microscopy, X-ray diffraction and thermo-gravimetric analysis). Finally, mortar samples were submitted to various leaching tests to evaluate the pollution potential of these matrices.
Book Synopsis Environnement et gestion des rejets miniers [ressource électronique] : manuel sur cédérom by : Michel Aubertin
Download or read book Environnement et gestion des rejets miniers [ressource électronique] : manuel sur cédérom written by Michel Aubertin and published by Mont-Royal, Québec : Presses internationales Polytechnique. This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Destiné aux étudiants inscrits au programme de génie minier, ce manuel met l'accent sur les problèmes associés à la gestion des rejets solides et liquides émis par les opérations minières au Québec. Il couvre les principaux aspects du sujet : nature et ampleur du problème, législation, incidences environnementales des contaminants d'origine minière, aspects scientifiques et techniques des approches disponibles pour résoudre les problèmes les plus sérieux, questions reliées à la fermeture et à la restauration de sites miniers, etc.
Book Synopsis Contribution à la valorisation des résidus miniers et industriels by : Georges Valence
Download or read book Contribution à la valorisation des résidus miniers et industriels written by Georges Valence and published by . This book was released on 1968 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le problème pratique qui se pose aujourd'hui est donc celui de la meilleure utilisation des minerais dits à faible teneur qui, dans les années antérieures, ont été souvent non utilisés ou mal utilisés. Cette nouvelle orientation de la notion de minerai permet donc d'inclure dans cette rubrique tous les déchets provenant des traitements subis par une matière, jadis ou actuellement, les buts recherchés dans cette première exploitation n'étant atteints que de façon partielle. Ainsi, des matières première ont été négligées par ce traitement, soit parce que les procédés utilisés étaient imparfaits, soit parce qu'un minéral n'était pas encore considéré comme utile et de valeur, soit enfin parce que la teneur était considérée comme trop faible. Pour tenter de voir quelles sortes de produits pouvaient être récupérées, une étude systématique de déchets miniers et de résidus industriels a été entreprise. Les perfectionnements techniques apportés aux méthodes de valorisation et les nouvelles mises au point de procédés de concentration ont été utilisés afin d'extraire d'une façon rentable un complément de produits marchands. C'est ainsi qu'ont été traitées des haldes plombo-zincifères, stanno-wolframifères, molybdo-cuprifères, manganasifères et des résidus industriels cuprifères.
Book Synopsis CIM Bulletin by : Canadian Institute of Mining and Metallurgy
Download or read book CIM Bulletin written by Canadian Institute of Mining and Metallurgy and published by . This book was released on 2000 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Industry and Environment written by and published by . This book was released on 1999 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guideline for Design for Disassembly and Adaptability in Buildings by : Canadian Standards Association
Download or read book Guideline for Design for Disassembly and Adaptability in Buildings written by Canadian Standards Association and published by . This book was released on 2006 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Code of Practice for Metal Mines by : Canada. Environment Canada
Download or read book Environmental Code of Practice for Metal Mines written by Canada. Environment Canada and published by . This book was released on 2009 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes operational activities and associated environmental concerns of this industrial sector. The document applies to the complete life cycle of mining, from exploration to mine closure, and environmental management practices are recommended to mitigate the identified environmental concerns. The recommended practices in the Code include the development and implementation of environmental management tools, the management of wastewater and mining wastes, and the prevention and control of environmental releases to air, water and land. The Code of Practice will be adopted by Environment Canada and others as a guidance document that recommends environmental protection practices for the mine life cycle. The Code applies specifically to metal mines but will provide useful guidance for all sectors of the mining industry.
Book Synopsis The Boundaries of the West African Craton by : Nasser Ennih
Download or read book The Boundaries of the West African Craton written by Nasser Ennih and published by Geological Society of London. This book was released on 2008 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applied Mineralogy in the Mining Industry by : W. Petruk
Download or read book Applied Mineralogy in the Mining Industry written by W. Petruk and published by Elsevier. This book was released on 2000-11-29 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.
Book Synopsis Advances in Environmental Geotechnics by : Yunmin Chen
Download or read book Advances in Environmental Geotechnics written by Yunmin Chen and published by Springer Science & Business Media. This book was released on 2011-02-04 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Advances in Environmental Geotechnics" presents the latest developments in this interdisciplinary field. The topics covered include basic and advanced theories for modeling of geoenvironmental phenomena, testing and monitoring for geoenvironmental engineering, municipal solid wastes and landfill engineering, sludge and dredged soils, geotechnical reuse of industrial wastes, contaminated land and remediation technology, applications of geosynthetics in geoenvironmental engineering, geoenvironmental risk assessment, management and sustainability, ecological techniques and case histories. This proceedings includes papers authored by core members of ISSMGE TC5 (International Society of Soil Mechanics and Geotechnical Engineering---Environmental Geotechnics) and geoenvironmental researchers from more than 20 countries and regions. It is a valuable reference for geoenvironmental and geotechnical engineers as well as civil engineers. Yunmin Chen, Xiaowu Tang, and Liangtong Zhan are Professors at the Department of Civil Engineering of Zhejiang University, China.
Book Synopsis Soil Contamination by : Marcelo L. Larramendy
Download or read book Soil Contamination written by Marcelo L. Larramendy and published by BoD – Books on Demand. This book was released on 2021-06-23 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited book, Soil Contamination - Threats and Sustainable Solutions, is intended to provide an update on different aspects of soil contamination exerted by a multiplicity of exogenous and endogenous causes. We hope that this book will continue to increase information from diverse sources and to give some real-life examples, extending the appreciation of the complexity of this subject in a way that may stimulate new approaches in relevant fields.
Author :Food and Agriculture Organization of the United Nations Publisher :Food & Agriculture Org. ISBN 13 :9789251039809 Total Pages :40 pages Book Rating :4.0/5 (398 download)
Book Synopsis Risk Management and Food Safety by : Food and Agriculture Organization of the United Nations
Download or read book Risk Management and Food Safety written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 1997 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Risk analysis is widely recognised as the fundamental methodology underlying the development of food safety standards. As recognised in the 1995 consultation, risk analysis is composed of three separate but integrated elements, namely risk assessment, risk management and risk communication. That consultation recognised risk communication as an interactive process of exchange of information and opinion on risk among risk assessors, risk managers, and other interested parties. Risk management is defined within Codex as the process of weighing policy alternatives in the light of the results of risk assessment and, if required, selecting and implementing appropriate control options, including regulatory measures. The outcome of the risk management process, as undertaken by Committees within the Codex Alimentarius system, is the development of standards, guidelines and other recommendations for food safety, m the national situation it is likely that different risk management decisions could be made according to different criteria and different ranges of risk management options. The overall objective of Codex is to ensure consumer protection and to facilitate international trade.
Book Synopsis Zinc in Soils and Plants by : A.D. Robson
Download or read book Zinc in Soils and Plants written by A.D. Robson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the International Symposium on `Zinc in Soils and Plants', held at The University of Western Australia, Perth, Western Australia, 27--28 September 1993
Book Synopsis Guide for Environmental Assessment by : United States. Soil Conservation Service
Download or read book Guide for Environmental Assessment written by United States. Soil Conservation Service and published by . This book was released on 1977 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pyrite Oxidation and Its Control by : V. P. Evangelou
Download or read book Pyrite Oxidation and Its Control written by V. P. Evangelou and published by CRC Press. This book was released on 2018-04-27 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pyrite Oxidation and its Control is the single available text on the market that presents the latest findings on pyrite oxidation and acid mine drainage (AMD). This new information is an indispensable reference for generating new concepts and technologies for controlling pyrite oxidation. This book focuses on pyrite oxidation theory, experimental findings on oxidation mechanisms, as well as applications and limitations of amelioration technologies. The text also includes discussions on the theory and potential application of novel pyrite microencapsulation technologies for controlling pyrite oxidation currently under investigation in the author's laboratory.
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