Download or read book The Role of Oxygen in Xanthate Flotation of Galena Pyrite and Chalcopyrite microfilm written by I.B. Klymowsky and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Oxygen in Xanthate Flotation of Galena Pyrite and Chalcopyrit written by Irenej Boris Klymowsky and published by . This book was released on 1968 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Conceptual Model for the Role of Oxygen in Xanthate Adsorption on Galena written by Edwin E. Maust and published by . This book was released on 1976 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Conceptual Model for the Role of Oxygen in Xanthate Adsorption on Galena written by Edwin E. Maust and published by . This book was released on 1976 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Interactive Effects of the Sulphite Ion PH and Dissolved Oxygen on the Flotation of Chalcopyrite and Galena from Black Mountain Ore written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: These effects were investigated in batch flotation studies, and by the measurement of rest and pulp potentials. At low additions of sulphurous acid as the pH regulator, flotation rate increased with increasing concentrations of dissolved oxygen. The recovery of chalcopyrite dropped significantly below a pH value of about 6,5 at 25 ppm of dissolved oxygen, and below a pH value of about 6 at a dissolved-oxygen concentration of 8,2 ppm. The rest and pulp potentials measured indicated that dixanthogen is the dominant species formed on chalcopyrite surfaces during flotation with sodium ethyl xanthate. The results suggested that the same species might have formed on galena surfaces in the pulp after the ore had been milled in a ceramic mill under nitrogen. Increased additions of sulphurous, sulphuric, and hydrochloric acids increased the rest potentials, while the addition of sodium sulphite decreased these potentials.
Download or read book A Review of Reactions in the Flotation System Galena xanthate oxygen written by and published by . This book was released on 1971 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The literature on the interactions between galena, xanthate and oxygen has been critically reviewed, with major emphasis on the work published after 1957. The contradictions in the literature have been pointed out and an attempt has been made to resolve them and to arrive at a picture of the best established chemistry of the interactions.
Download or read book Interactions Between Sulphide Minerals and Xanthates 1 The Formation of Monothiocarbonate at Galena and Pyrite Surfaces written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The rate of decomposition of potassium ethyl monothiocarbonate has been determined at pH values between 5 and 10, and its molar absorptivity at 221 nm determined to be 1.24x10000 mol/cm. A novel apparatus for use in the study of reactions between sulphide minerals, oxygen and thiol reagents has been developed, and applied to the reactions of potassium ethyl xanthate with galena and pyrite. It has been shown that both minerals react with ethyl xanthate in the presence of oxygen or oxidation products to form soluble as well as adsorbed xanthate derivatives. The soluble derivative has been identified to be ethyl monothiocarbonate. The adsorbed xanthate at a galena surface, unlike that at a pyrite surface, is gradually converted to a soluble monothiocarbonate under the action of dissolved oxygen. The effect of variables such as pH, the initial xanthate and oxygen concentrations, and the initial state of oxidation of the mineral on the formation of monothiocarbonate has been studied. It is tentatively proposed that an intermediate adsorbed mixed xanthate-hydroxide species is involved in the formation of monothiocarbonate at both galena and pyrite surfaces. The significance of the formation of monothiocarbonate to flotation practice is discussed briefly. The formation of monothiocarbonate represents a wastage of reagent, and could lead to a decrease in flotability of xanthated galena with time of exposure to aerated solutions. (AUAB).
Download or read book Illumination and the Adsorption of Xanthate in the Flotation of Galena and Marmatite microform written by Guarnaschelli, Claudio and published by National Library of Canada. This book was released on 1969 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Formation of Monothiocarbonates During the Reaction Between Xanthates and Sulphide Minerals in Flotation Systems written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The reactions between galena, pyrite, sphalerite, and chalcocite and a number of xanthate homologues have been studied. It has been shown that both galena and pyrite from a soluble product, the appropriate monothiocarbonate, as well as the characteristic adsorbed products. With galena and ethyl xanthate in the presence of excess oxygen, all the adsorbed xanthate returns to the solution in the form of monothiocarbonate, whereas ethyl xanthate adsorbed at a pyrite surface cannot be removed in this manner. In reactions between these two minerals and the higher xanthate homologues, the amount and rate of formation of soluble monothiocarbonate are much less than those observed with ethyl xanthate. It is suggested that the formation of monothiocarbonate takes place via mixed metal hydroxy-xanthate species adsorbed at the surface and not from adsorbed dixanthogen. Soluble monothiocarbonate is not formed during reactions between chalcocite and sphalerite and xanthate solutions. The former result is in harmony with the postulated mechanism, the latter apparently not. The adsorption of monothiocarbonate at the surfaces of the minerals, both in the presence and absence of xanthate is considered, and it is concluded that the adsorption of monothiocarbonates is much weaker than that of the corresponding xanthates.
Download or read book Electrochemistry of Metal Chalcogenides written by Mirtat Bouroushian and published by Springer Science & Business Media. This book was released on 2010-04-23 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author provides a unified account of the electrochemical material science of metal chalcogenide (MCh) compounds and alloys with regard to their synthesis, processing and applications. Starting with the chemical fundamentals of the chalcogens and their major compounds, the initial part of the book includes a systematic description of the MCh solids on the basis of the Periodic Table in terms of their structures and key properties. This is followed by a general discussion on the electrochemistry of chalcogen species, and the principles underlying the electrochemical formation of inorganic compounds/alloys. The core of the book offers an insight into available experimental results and inferences regarding the electrochemical preparation and microstructural control of conventional and novel MCh structures. It also aims to survey their photoelectrochemistry, both from a material-oriented point of view and as connected to specific processes such as photocatalysis and solar energy conversion. Finally, the book illustrates the relevance of MCh materials to various applications of electrochemical interest such as (electro)catalysis in fuel cells, energy storage with intercalation electrodes, and ion sensing.
Download or read book Mechanochemistry in Nanoscience and Minerals Engineering written by Peter Balaz and published by Springer Science & Business Media. This book was released on 2008-10-20 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanochemistry as a branch of solid state chemistry enquires into processes which proceed in solids due to the application of mechanical energy. This provides a thorough, up to date overview of mechanochemistry of solids and minerals. Applications of mechanochemistry in nanoscience with special impact on nanogeoscience are described. Selected advanced identification methods, most frequently applied in nanoscience, are described as well as the advantage of mechanochemical approach in minerals engineering. Examples of industrial applications are given. Mechanochemical technology is being applied in many industrial fields: powder metallurgy (synthesis of nanometals, alloys and nanocompounds), building industry (activation of cements), chemical industry (solid waste treatment, catalyst synthesis, coal ashes utilization), minerals engineering (ore enrichment, enhancement of processes of extractive metallurgy), agriculture industry (solubility increase of fertilizers), and pharmaceutical industry (improvement of solubility and bioavailability of drugs). This reference serves as an introduction to newcomers to mechanochemistry, and encourages more experienced researchers to broaden their knowledge and discover novel applications in the field.
Download or read book Chemical Metallurgy written by Chiranjib Kumar Gupta and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 831 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical metallurgy is a well founded and fascinating branch of the wide field of metallurgy. This book provides detailed information on both the first steps of separation of desirable minerals and the subsequent mineral processing operations. The complex chemical processes of extracting various elements through hydrometallurgical, pyrometallurgical or electrometallurgical operations are explained. In the choice of material for this work, the author made good use of the synergy of scientific principles and industrial practices, offering the much needed and hitherto unavailable combination of detailed treatises on both compiled in one book.
Download or read book Mechanochemistry of Solid Surfaces written by ?mmanuil Markovich Gutman and published by World Scientific. This book was released on 1994 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the fundamental relationships between solid surface chemical reactivity and the stressed state of surface layers; developed mainly by the author. Acceleration of chemical reactions by mechanical action (mechanochemical effect) and near-surface plasticity increase caused by chemical reactions (chemomechanical effect) acting simultaneously; open new possibilities for the control of a wide range of processes from corrosion to new materials engineering.This monograph is a unique work on this subject and will be essential reading for undergraduate and postgraduate students engaged in studying surface phenomena in materials science; chemistry and chemical engineering; as well as for scientists and engineers in the industries where these phenomena are important.
Download or read book Antifascisms written by David Ward and published by Fairleigh Dickinson Univ Press. This book was released on 1996 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an in-depth analysis of three of the most crucial years in twentieth-century Italian history, the years 1943-46. After more than two decades of a Fascist regime and a disastrous war experience during which Italy changed sides, these years saw the laying of the political and cultural foundations for what has since become known as Italy's First Republic. Drawing on texts from the literature, film, journalism, and political debate of the period, Antifascisms offers a thorough survey of the personalities and positions that informed the decisions taken in this crucial phase of modern Italian history.
Download or read book History of Flotation written by A. J. Lynch and published by . This book was released on 2010 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Floatation was the process that transformed the non-ferrous mining industry and the industries and economies of the world. It was an improbable process; nobody could have imagined 100 years ago that floating high specific gravity particles on water would be the basis of one of the world's great technologies. This book tells the story of the early days of flotation and is as much about the engineers, managers and financiers who supported the experiments and built the plants as it is about the technology that was developed. Flotation practitioners will enjoy reading about the history of flotation machines, the ingenuity applied and the competitive tension between the manufacturers.
