Download or read book Interactions in the System Galena xanthate oxygen written by and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions between solutions of potassium ethyl xanthate and galena have been studied. Advances in experimental technique have allowed certain deficiencies in previous work on the subject to be identified. The most important is the failure to recognize slow components of the interaction. Developments in technique also gave improved control of oxygen and oxidation processes in the system. Thus, a preliminary study of the quantitative aspects of the role of oxygen could be made. It has been shown that, within the sensitivity of the experiments, there is no reaction between xanthate and galena in the absence of oxygen. In the presence of oxygen, either in solution or as surface oxidation products, the reaction does not appear to terminate. If oxygen-containing xanthate solutions are contacted with a newly sulphided mineral surface, an induction period is observed; this is followed by a rapid abstraction of xanthate from solution, which gradually slows down but never ceases. As the surface becomes increasingly oxidized, the length of the induction period decreases and the initial rate of abstraction increases, but the behaviour of the system is otherwise unaffected. Once the surface is sufficiently oxidized, the abstraction of xanthate continues even in the absence of dissolved oxygen. The rate of abstraction of xanthate from oxygen-containing solutions appears to depend upon the oxygen concentration, the quantity of xanthate that has already been abstracted from the solution, and the time for which the solution has been in contact with the mineral. It is not certain whether all of the xanthate abstracted from the solution is adsorbed by the mineral. The treatment of the xanthated mineral with solutions of sodium sulphide failed to recover all of the abstracted reagent. An investigation into the possibility that the rate of xanthate decomposition is accelerated by the presence of the mineral gave inconclusive results. A more thorough study will be necessary before the reason for the discrepancy can be identified. A consideration of the literature on the system reveals an important anomaly, which centres on the failure of all attempts to reverse the adsorption of xanthate onto sulphide minerals. This anomaly can be explained in the light of the present work. Since previous workers have failed to detect the slower components of interactions in the system, they have been led to consider that equilibrium had been established under conditions where there was still a strong driving force in the forward direction. Therefore, it is probable that they failed to reverse the driving force in their attempts to desorb the reagent.
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 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 Quantitative Aspects of the Role of Oxygen in the Interaction Between Xanthate and Galena written by and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The reaction between potassium ethyl xanthate, oxygen, and galena over periods of 20 to 30 hr has been studied. Quantitative results are presented for the reaction at pH 10, but it is shown that the general features of the behaviour are the same within the range pH 8 to 11. Two types of reaction are observed. The first involves adsorption of the xanthate and takes place at a rate, dq/dt, that decreases exponentially with the quantity of reagent adsorbed. The second is thought to involve reaction between the xanthate and the oxygen catalyzed by the surface. Its rate increases with time until it reaches a constant value, Rf. A product of reaction may be ethyl monothiocarbonate. The parameters of the adsorption rate equation, and, therefore, the rate and extent of adsorption at any time, vary directly with the square root of partial pressure of oxygen (p) for p
Download or read book Quantitative Aspects of the Interaction Between Galena Xanthate and Oxygen at a PH Value of 10 written by and published by . This book was released on 1969 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A continuous-flow contactor and ultraviolet spectrophotometry have been used to study the reaction between potassium ethyl xanthate, oxygen, and galena over periods of 20 to 30 hours. Quantitative results are presented for the reaction at a pH value of 10, but it is shown that the general features of the behaviour are the same within the range pH 8 to pH 11. Two types of reaction are observed. The first involves adsorption of the xanthate and takes place at a rate, dq/dt, that decreases exponentially with the quantity of reagent adsorbed: (dq/dt = a exp(-q/2.303 g)). The second is thought to involve reactions between the xanthate and the oxygen catalysed by the galena-xanthate surface. Its rate increases with time until it reaches a constant value, Rf. The period for which the adsorption reaction is dominant depends on pH. The presence of soluble reaction products in the reaction solutions was revealed by differential spectrophotometry. A tentative identification with the ethyl monothiocarbonate was made. When oxygen and xanthate are applied simultaneously to an unoxidized galena surface, an induction period is required before xanthate begins to react. The parameters of the adsorption-rate equation, and, therefore, the rate and extent of adsorption at any time, vary directly with the square root of partial pressure of oxygen (p) for p
Download or read book The Physical Chemistry of Mineral reagent Interactions in Sulfide Flotation written by and published by . This book was released on 1979 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of a Closed Recirculation Apparatus in the Study of the Galena Oxygen Xanthate System written by P. J. Harris and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of Investigations written by and published by . This book was released on 1976 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Interaction of Chalcocite Oxygen and Xanthates written by P. J. Harris and published by . This book was released on 1977 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sulphide deposits their origin and processing written by P.M.J Gray and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Information Circular written by and published by . This book was released on 1980 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxidation of Sulfide Minerals in Benefication Processes written by A Abramov and published by CRC Press. This book was released on 1998-01-23 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of recent experimental studies and modern theoretical concepts are combined in this volume to provide a comprehensive analysis of sulfide mineral oxidation processes. Introductory chapters discuss the properties of sulfide minerals and various investigative techniques, followed by chapters on oxidation mechanisms and the behavior of minerals under these various oxidizing conditions. This book also demonstrates modern methods of physical-chemical modelling and the regulation and optimization of flotation processes.
Download or read book Mineral Processing Design written by B. Yarar and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is based on the proceedings of the "NATO Advanced study Institute on Mineral Processing Design" held in Bursa-Turkey on August 24-31, 1984. The institute was organized by Professor B. Yarar of the Colorado School of Mines, Golden, Colorado, 80401, USA, Professor G. Ozbayoghu and Professor Z. M. Dogan of METU-Ankara, Turkey, who was the director. The purpose of the institute was to provide an international forum on the subject and update the information available. Participants were from Turkey, England, Greece, Spain, Portugal, Belgium, Canada, and the USA. Besides authors contributing to this volume, presentations were also made by Drs. Yarar, Raghavan, Schurger, and Mr. Kelland. Many assistants and colleagues helped. They are gratefully acknowledged. Acknowledgment is also owed to Drs. Ek, de Kuyper, and Tolun. Dr. Gfilhan Ozbayoglu, and Mr. S. Ozbayoglu were particularly helpful in the overall organization and hosting of many international guests. We owe them special thanks. NATO, Scientific Affairs Division, is gratefully acknowledged for the grant which made this activity possible. Z. M. Dogan B. Yarar 2 APPLIED MINERALOGY IN ORE DRESSING William Petruk CANMET, 555 Booth Street, Ottawa, Ontario, KIA OGI ABSTRACT Mineralogy applied to ore dressing is a reliable guide for designing and operating an efficient concentrator. A procedure for conductiqg mineralogical studies in conjunction with ore dressing was, therefore, developed. The procedure includes characterizing the ore and analysing the mill products.
Download or read book Electronic Structure and Surfaces of Sulfide Minerals written by Jianhua Chen and published by Elsevier. This book was released on 2020-04-23 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electronic Structure and Surfaces of Sulfide Minerals: Density Functional Theory and Applications examines the mineral structure and electronic properties of minerals and their relationship to mineral floatability by density functional theory (DFT). This pragmatic guide explores the role of minerals in flotation by focusing on the mineral surface structure, electronic properties, and the adsorption of flotation agents through the study of the microscopic mechanism of reagents from the structure and properties of minerals. The flotation mechanism is explained from the point-of-view of solid physics, which is of great significance for both theoretical research and practical applications. The study of the structure and properties of the minerals can reveal the essential nature of mineral flotation, hence why minerals have floatability, the mechanism of response of different minerals to different chemicals, and the origin of the selectivity of flotation agents. - Discusses the relationship between mineral properties and floatability in terms of crystal structure, atomic coordination structure and electronic properties - Covers the influence of the surface structure of the mineral on surface charge distribution, reactivity and electron density, including a quantitative calculation method for the atomic reactivity of the mineral surface - Includes research on the microstructure and mechanism of reagent molecules adsorption on the surface of minerals, focusing on the interactions between water molecules, oxygen molecules and reagents
Download or read book Unrestricted Mintek Publications written by and published by . This book was released on 1966 with total page 236 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 Beneficiation of Unweathered Indian Calcareous Phosphate Rock by Calcination and Hydration written by Charles M. McCulloch and published by . This book was released on 1976 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
