Download or read book Control of Iron and Sulfur Oxidation Activities of Thiobacillus Ferrooxidans and Bacterial Leaching of Metals from Sulfide Ores written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Control of Iron and Sulfur Oxidation Activities of Thiobacillus Ferrooxidans and Bacterial Leaching of Metals from Sulfide Ores written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Thiobacillus ferrooxidans' is a dominant member of the bioleaching community responsible for mineral solubilization. In order to capitalize on its natural ability to solubilize metal sulfides this study began with a detailed analysis of the bacteria's iron and sulfur oxidation pathways. Only those cells grown in the presence of high iron concentrations retained the ability to oxidize ferrous iron. Sulfur oxidation was faster in sulfur grown cells but in both the iron and sulfur grown cells it proceeded via a sulfur oxidizing system which used molecular oxygen as the terminal acceptor. Iron grown 'T. ferrooxidans' oxidized sulfite by a free radical mechanism initiated by Fe3+ on the cell surface, with cytochrome oxidase involved in the regeneration of Fe3+ by the normal Fe2+ oxidizing system. Metal extraction from mineral ore by 'Thiobacillus ferrooxidans ' is achieved through two reactions: the oxidation of ferrous iron to ferric and that of sulfide/sulfur to sulfuric acid. The oxidation of either ferrous iron or sulfur by 'Thiobacillus ferroxidans' was selectively inhibited or controlled by various anions, inhibitors and osmotic pressure. Bacterial leaching of sulfide ores using 'Thiobacillus ferooxidans, Thiobacillus thiooxidans' or a combination of the two was studied under various anionic concentrations. Selective zinc and copper solubilization was obtained by inhibiting iron oxidation without affecting sulfur/sulfide oxidation. Phosphate reduced iron solubilization from a pyrite (FeS2) - sphalerite (ZnS) mixture without significantly affecting zinc solubilization. Copper leaching from a chalcopyrite (CuFeS2) sphalerite mixture was stimulated by phosphate, while chloride accelerated zinc extraction. In a complex sulfide ore containing pyrite, chalcopyrite and sphale ite both phosphate and chloride reduced iron solubilization and increased copper extraction, while only chloride stimulated zinc extraction. Mineral solubilization under natural conditions is a com.
Download or read book Metal Leaching by Thiobacillus Ferrooxidans Strains and Their Ferrous Iron and Sulfur Oxidation and Ferric Iron Reduction Activities written by Travis L. Takeuchi and published by . This book was released on 1990 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Leaching by Thiobacillus Ferrooxidans Strains and Their Ferrous Iron and Sulfur Oxidation and Ferric Iron Reduction Activities microform written by Travis L. Takeuchi, (Travis Lee) and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1990 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Activity Parameters in Thiobacillus Ferrooxidans Strains as Criteria for Mineral Leaching Efficiency UP M 589 written by and published by . This book was released on 1989 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bacterial leaching of sulfide ores using Thiobacillus ferrooxidans is an important process for the extraction of economically valuable metals from ores not amenable to traditional methods, with the advantage of not releasing the oxidized sulfur into the atmosphere. In spite of its great potential, the use of bacterial leaching has been limited, mainly because of the relatively slow rate and low concentration of metals extracted into solution. This report presents the results of tests using a number of strains of T. ferrooxidans and T. thiooxidans on growth and activity, including the effects of metals (Cu, Zn and other inhibitory metals often released from sulfide ores), to establish criteria essential for the selection of strains best suited for effective leaching.
Download or read book Iron Oxidation by Thiobacillus Ferrooxidans written by Sun Ki Kang and published by . This book was released on 1989 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bacterium most frequently used in microbial leaching processes and studies is Thiobacillus ferrooxidans. Applications of this bacterium include the treatment of coal, low-grade ores and industrial solid wastes for the solubilization of pyrite and other trace metals associated with sulfides. The goal of this study was the development of a standard procedure that can be used for screening or comparing various strains of Thiobacillus ferrooxidans. Measuring the oxidation of ferrous iron is a quick and simple method for predicting the relative effectiveness of a given strain of T. ferrooxidans in microbial leaching operations. When conducting experiments for the relative determination of bacterial activity, 9K medium with a low initial soluble ferrous iron concentration and a pH of approximately 2.0 is recommended. Also it is important to begin with the same ferric iron concentration in bacterial cultures, while minimizing the amount of precipitated iron. The effect of inoculum size on the maximum oxidation rate of ferrous iron is negligible; however, lag time can be reduced by using larger inocula.
Download or read book Canadian Journal of Microbiology written by and published by . This book was released on 2001 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bureau of Mines Research written by United States. Bureau of Mines and published by . This book was released on 1991 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biomining written by Douglas E. Rawlings and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomining is the use of microorganisms in the recovery of metals from ores. During bioleaching, metals such as copper, nickel or zinc are oxidized through microbial action from the water-insoluble sulfide to the soluble sulfate forms. Although gold is inert to microbial action, microbes can also be used in gold recovery from certain types of ores because as they oxidize the ore, they open up its structure, thereby allowing a gold-solubilizing agent such as cyanide to penetrate the ore. The book describes several industrial bioleaching and biooxidation processes as well as the underlying theory and biology of the microbes involved.
Download or read book Bioelectrosynthesis written by Falk Harnisch and published by Springer. This book was released on 2019-01-04 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses both the latest experimental research in bioelectrosynthesis and current applications. Beginning with an introduction into the “electrification of biotechnology” as well as the underlying fundamentals, the volume then discusses a wide range of topics based on the interfacing of biotechnological and electrochemical reaction steps. It includes contributions on the different aspects of bioelectrochemical applications for synthesis purposes, i.e. the production of fine and platform chemicals based on enzymatically or microbially catalyzed reactions driven by electric energy. The volume finishes with a summary and outlook chapter which gives an overview of the current status of the field and future perspectives. Edited by experts in the field, and authored by a wide range of international researchers, this volume assesses how research from today’s lab bench can be developed into industrial applications, and is of interest to researchers in academia and industry.
Download or read book Mineral Processing Plant Design Practice and Control written by Andrew L. Mular and published by SME. This book was released on 2002 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Based on 138 proceedings papers from October 2002, this broad reference will become the new standard text for colleges and will become a must for engineers, consultants, suppliers, manufacturers.
Download or read book Geomicrobiology Molecular and Environmental Perspective written by Alexander Loy and published by Springer Science & Business Media. This book was released on 2010-07-23 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of microorganisms with geological activities results in processes influencing development of the Earth’s geo- and biospheres. In assessing these microbial functions, scientists have explored short- and longterm geological changes attributed to microorganisms and developed new approaches to evaluate the physiology of microbes including microbial interaction with the geological environment. As the field of geomicrobiology developed, it has become highly interdisciplinary and this book provides a review of the recent developments in a cross section of topics including origin of life, microbial-mineral interactions and microbial processes functioning in marine as well as terrestrial environments. A major component of this book addresses molecular techniques to evaluate microbial evolution and assess relationships of microbes in complex, natural c- munities. Recent developments in so-called ‘omics’ technologies, including (meta) genomics and (meta)proteomics, and isotope labeling methods allow new insights into the function of microbial community members and their possible geological impact. While this book summarizes current knowledge in various areas, it also reveals unresolved questions that require future investigations. Information in these chapters enhances our fundamental knowledge of geomicrobiology that contributes to the exploitation of microbial functions in mineral and environmental biotechn- ogy applications. It is our hope that this book will stimulate interest in the general field of geomicrobiology and encourage others to explore microbial processes as applied to the Earth.
Download or read book Inorganic Sulfur Oxidation by Iron oxidizing Bacteria written by Syracuse University. Department of Biology and published by . This book was released on 1971 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acidophile Microbiology From Extreme Environments to Biotechnological Applications written by Elizabeth Watkin and published by Frontiers Media SA. This book was released on 2024-07-22 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acidophiles are microorganisms that thrive in acidic environments, and these microorganisms can be found in a wide range of habitats, including acid mine drainage, volcanic hot springs, and acidic soils. Despite the extreme conditions they live in, acidophiles have adapted unique biochemical pathways and mechanisms to survive and thrive in such harsh environments. This Research Topic aims to bring together recent advances in the field of acidophile microbiology, from fundamental research on microbial diversity, physiology, and ecology in extreme environments to biotechnological applications, including bioleaching and bioremediation.
Download or read book Microbial Processing of Metal Sulfides written by Edgardo R. Donati and published by Springer. This book was released on 2010-10-19 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of microbiological methods to the extraction of metals from minerals is supported by several bioleaching and biooxidation processes operating in different sites over the world. This book details the basic aspects of the process with special emphasis on recent contributions regarding the chemical and microbial aspects of the bioleaching process and the use of microorganisms in the treatment of complex ores and concentrates.
Download or read book Biotechnology of Extremophiles written by Pabulo H Rampelotto and published by Springer. This book was released on 2016-04-27 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aimed at research scientists and biotechnologists, this book is an essential reading for those working with extremophiles and their potential biotechnological application. Here, we provide a comprehensive and reliable source of information on the recent advances and challenges in different aspects of the theme. Written in an accessible language, the book is also a recommended as reference text for anyone interested in this thriving field of research. Over the last decades, the study of extremophiles has provided ground breaking discoveries that challenge our understanding of biochemistry and molecular biology. In the applied side, extremophiles and their enzymes have spawned a multibillion dollar biotechnology industry, with applications spanning biomedical, pharmaceutical, industrial, environmental, and agricultural sectors. Taq DNA polymerase (which was isolated from Thermus aquaticus from a geothermal spring in Yellowstone National Park) is the most well-known example of the potential biotechnological application of extremophiles and their biomolecules. Indeed, the application of extremophiles and their biologically active compounds has opened a new era in biotechnology. However, despite the latest advances, we are just in the beginning of exploring the biotechnological potentials of extremophiles.
