Download or read book A Fundamental Investigation Into the Microwave Assisted Leaching of Sulphide Minerals written by Mohammad Al-Harahsheh and published by . This book was released on 2005 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2006 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Microwave Pretreatment on the Processing of a Sulphide Ore written by Gilberto Rodrigues da Silva and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The mining industry is one of the most energy intensive sectors of the economy, accounting for almost 2% of the world's electrical consumption. In a mill, most of this energy is spent in comminution processes, especially grinding. As the conventional grinding techniques are reported to present low efficiency, new methods have been proposed to pre-treat the ore, making it easier to grind. Among these techniques, Microwave Assisted Comminution (MAC) has presented great potential to reduce the energy required in grinding and also to improve liberation and flotation. MAC relies on the fact that minerals present different heating rates when microwave-treated. Therefore, due to thermal gradients, stresses can develop at grain boundaries within the ore, forming intergranular fractures which enhance the liberation of valuable minerals. Since the heat can cause oxidation, flotation of sulphide ores is affected by MAC. This Ph.D. research studied how microwave irradiation affects the phase composition, surface chemistry, surface charge, hydrophobicity and morphology of the main sulphide minerals present in the Discovery Hill Cu-Ni sulphide ore: pyrrhotite, chalcopyrite and pentlandite. The effects of the treatment on the adsorption and floatability of these minerals with potassium amyl xanthate and sodium oleate were also examined. Finally, the effects of the treatment on the Bond Work Index, liberation and flotation performance of the ore were investigated. The results of this study indicate that chalcopyrite, pyrrhotite and pentlandite are oxidized differently by microwave treatment. While chalcopyrite and pyrrhotite presented no phase transformation, a S-rich mineral phase was formed onto the surface of pentlandite. Chalcopyrite had its collectorless floatability enhanced and its surface energy decreased by short time exposure to microwave radiation. Longer exposure times made chalcopyrite more hydrophilic and decreased its floatability, whereas any exposure time led to an increase in the hydrophilicity of pyrrhotite and pentlandite. The surface of all the minerals became more positively charged at acidic pH. In addition, microwave irradiation increased the minerals' specific surface area, especially that of pentlandite. It was also observed an increase in the average pore diameter in the surface of chalcopyrite and a decrease for pyrrhotite and especially pentlandite. Greater adsorption of potassium amyl xanthate was noticed although the recovery pyrrhotite and chalcopyrite decreased. In the presence of sodium oleate, the recovery of all minerals dropped significantly, with the exception of pyrrhotite at acidic and neutral pH. The Discovery Hill Cu-Ni ore presents a favorable mineralogy to benefit from MAC. Exposure time, power level, samples mass, particle size and the use of quenching with water were important variables affecting both the ore's Bond Work Index (Wi) and flotation performance. While coarser particles showed greater decrease in the Wi, the finer samples presented significant increase in the enrichment ratio after being irradiated. The occurrence of melting/sintering was observed to be detrimental to both grinding and flotation, suggesting homogeneity to be of primary importance for the future development of MAC." --
Download or read book Principles of Extractive Metallurgy written by Fathi Habashi and published by . This book was released on 1986 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Desulfurization written by S. K. Kawatra and published by Taylor & Francis. This book was released on 2001 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was written to provide a comprehensive survey of the current state-of-the-art information in coal preparation, with particular emphasis on coal desulfrization. The primary audience for this book will be practising coal preparation engineers who need complete information about all of the coal preparation and desulphurization technologies that are available now, or that may be available in the future. It will also be valuable for coal researchers who need details and comparative data for cutting-edge technologies that are still under development. The main emphasis is on physical coal preparation, but chapters also include chemical and biological technologies that are under development, but not yet used in industrial practice. Along with the successful technologies, also included are details of processes and techniques that were attempted, but were subsequently abandoned, along with discussions of the reasons they were abandoned.
Download or read book In Situ Investigation of a Column Leach Test on a Base metal Sulphide Ore written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mineralogical monitoring of the feed, products and residues during metallurgical testwork provides essential information on the mechanisms of the leaching process. It is for this reason that a fairly detailed mineralogical investigation was requested when low recoveries were encountered during bacterial leaching tests carried out in Perspex columns on a base metal sulphide ore at Mintek. The methodology applied during this challenging investigation not only required the application of a variety of mineralogical techniques, including microscopy, X-ray diffraction (XRD), and electron microprobe techniques (EMP), but a novel method was developed to examine the leaching process mechanism in situ. The general principles of the study should be applicable to any type of sulphide ore being investigated for its amenability to heap leaching.
Download or read book Microwave Assisted Organic Synthesis written by Jason Tierney and published by John Wiley & Sons. This book was released on 2009-02-12 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first reports on the application of microwaves in organicsynthesis date back to 1986, but it was not until the recentintroduction of specifically designed and constructed equipment,which countered the safety and reproducibility concerns, thatsynthetic application of microwaves has become established as alaboratory technique. Microwave assisted synthesis is now beingadopted in many industrial and academic laboratories to takeadvantage of the novel chemistry that can be carried out using avariety of organic reaction types. This book demonstrates the underlying principles of microwavedielectric heating and, by reference to a range of organic reactiontypes, it's effective use in synthetic organic chemistry. Toillustrate the impact microwave assisted organic synthesis can haveon chemical research, case studies drawn mainly from thepharmaceutical industry are presented.
Download or read book Engineers Handbook of Industrial Microwave Heating written by Roger J. Meredith and published by IET. This book was released on 1998 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete guide, this book presents industrial microwave heating from an engineering base and integrating the essential elements of microwave theory and heat transfer with practical design, application and operational issues.
Download or read book Monitored Natural Attenuation of Inorganic Contaminants in Ground Water written by and published by . This book was released on 2007 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: V.3 ... consists of individual chapters that describe 1) the conceptual background for radionuclides, including tritium, radon, strontium, technetium, uranium, iodine, radium, thorium, cesium, plutonium-americium and 2) data requirements to be met during site characterization.
Download or read book Characterization of Minerals Metals and Materials 2020 written by Jian Li and published by Springer Nature. This book was released on 2020-01-23 with total page 723 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection gives broad and up-to-date results in the research and development of materials characterization and processing. Topics covered include advanced characterization methods, minerals, mechanical properties, coatings, polymers and composites, corrosion, welding, magnetic materials, and electronic materials. The book explores scientific processes to characterize materials using modern technologies, and focuses on the interrelationships and interdependence among processing, structure, properties, and performance of materials.
Download or read book Hydrometallurgy in Extraction Processes written by C. K. Gupta and published by CRC Press. This book was released on 1990-08-15 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume set provides a full account of hydrometallurgy. Filled with illustrations and tables, this work covers the flow of source material from the mined or concentrate state to the finished product. It also highlights ion exchange, carbon adsorption and solvent extraction processes for solution purification and concentration. The extensive reference list-over 850-makes this set a valuable resource for extraction and process metallurgists, researchers, and practitioners.
Download or read book Industrial Microwave Heating written by A. C. Metaxas and published by IET. This book was released on 1983 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a broad coverage of the theory and practice of industrial microwave heating. It introduces the physical processes behind dipolar and conductivity loss mechanisms and follows with a thorough presentation of dielectric property data of many industrial materials as a function of the moisture content, temperature and frequency, focussing on the interpretation of such data as regards the suitabiliy for processing these materials with microwave energy. The basic equations which govern the power dissipation, attenuation, phase constant, penetration depth and skin depth are derived from first principles while the transport equations of heat, mass and pressure are qualitatively described, giving particular emphasis to the physical mechanisms behind high frequency drying. The book provides established procedures backed by theoretical formulations for the design of industrial travelling wave and multimode applicators. It also provides extensive coverage of single mode fundamental or higher order resonant cavities and outlines a number of atypical applicator structures. It describes the essential features of processing with microwaves under vacuum and presents a brief introduction to the mechanisms which lead to gas breakdown. It stresses the need for a degree of hybridisation with other electrical or conventional heating systems and discusses a few such schemes. The book outlines a number of systems for limiting leakage from on-line industrial microwave systems and concludes with an extensive discussion of successful industrial applications.
Download or read book Sample Preparation for Trace Element Analysis written by Zoltan Mester and published by Elsevier. This book was released on 2003-12-16 with total page 1339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the collection of a sample, every analytical chemist will agree that its subsequent preservation and processing are of paramount importance. The availability of high performance analytical instrumentation has not diminished this need for careful selection of appropriate pretreatment methodologies, intelligently designed to synergistically elicit optimum function from these powerful measurement tools. Sample Preparation for Trace Element Analysis is a modern, comprehensive treatise, providing an account of the state-of-the art on the subject matter. The book has been conceived and designed to satisfy the varied needs of the practicing analytical chemist. It is a multi-author work, reflecting the diverse expertise arising from its highly qualified contributors. The first five chapters deal with general issues related to the determination of trace metals in varied matrices, such as sampling, contamination control, reference materials, calibration and detection techniques. The second part of the book deals with extraction and sampling technologies (totaling 15 chapters), providing theoretical and practical hints for the users on how to perform specific extractions. Subsequent chapters overview seven major representative matrices and the sample preparation involved in their characterization. This portion of the book is heavily based on the preceding chapters dealing with extraction technologies. The last ten chapters are dedicated to sample preparation for trace element speciation. - First title to provide comprehensive sample preparation information, dealing specifically with the analysis of samples for trace elements. - The 39 chapters are authored by international leaders of their fields.
Download or read book The Development and Application of Microwave Heating written by Wenbin Cao and published by . This book was released on 2012 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microwave heating has found many applications ranging from the microwave ovens in kitchen to heat food, to a sterilization apparatus for medical treatment, to materials processing in the various fields. In those applications, microwave heating demonstrates significant advantages over conventional methods in reduced processing time and less environmental impacts. This book is comprised of eight chapters within three parts highlighting different aspects covering both the basic understandings and the advanced applications. The included discussion on the application of microwave heating in the field of food-, chemical engineering-, agricultural-, forestry- and mineral processing industry will provide a passage for future research. As a monograph, it is designed to be a fundamental reference book, aiming to help the readers to concentrate on the key aspects behind the success in microwave heating.
Download or read book Extractive Metallurgy of Niobium written by A.K. Suri and published by Routledge. This book was released on 2017-11-13 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growth and development witnessed today in modern science, engineering, and technology owes a heavy debt to the rare, refractory, and reactive metals group, of which niobium is a member. Extractive Metallurgy of Niobium presents a vivid account of the metal through its comprehensive discussions of properties and applications, resources and resource processing, chemical processing and compound preparation, metal extraction, and refining and consolidation. Typical flow sheets adopted in some leading niobium-producing countries for the beneficiation of various niobium sources are presented, and various chemical processes for producing pure forms of niobium intermediates such as chloride, fluoride, and oxide are discussed. The book also explains how to liberate the metal from its intermediates and describes the physico-chemical principles involved. It is an excellent reference for chemical metallurgists, hydrometallurgists, extraction and process metallurgists, and minerals processors. It is also valuable to a wide variety of scientists, engineers, technologists, and students interested in the topic.
Download or read book Advances in Mineral Processing and Hydrometallurgy written by Corby G Anderson and published by Mdpi AG. This book was released on 2021-09-23 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a Special Issue of Metals devoted to aspects of Advances in Mineral Processing and Hydrometallurgy. This includes a global call for article submissions that also included Characterization along with Recycling and Waste Minimization. As such, both primary and recycled aspects will be considered. Possible specific topics included Mineralogy, Geometallurgy, Thermodynamics, Kinetics, Comminution, Classification, Physical Separations, Liquid-Solid Separations, Leaching, Solvent Extraction, Ion Exchange, Activated Carbon, Precipitation, Reduction, Process Economics and Process Control. Suggested application areas were in Gold, Silver, PGM's, Aluminum, Copper, Zinc, Lead, Nickel, and Titanium. Critical Metals articles on topics such as Lithium, Antimony Tellurium, Gallium, Germanium, Cobalt, Graphite, Indium, and Rare Earth were also welcome. As such, this Special Issue of Metals was well supported by diverse submissions and the final publication of high-quality peer-reviewed articles.
Download or read book Principles of Mineral Processing written by Maurice C. Fuerstenau and published by SME. This book was released on 2003 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive reference examines all aspects of mineral processing, from the handling of raw materials to separation strategies to the remediation of waste products. It incorporates state-of-the-art developments in the fields of engineering, chemistry, computer science, and environmental science.
