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 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 Principles of Mineral Flotation written by Ian William Wark and published by . This book was released on 1984 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrochemistry of Flotation of Sulphide Minerals written by Yuehua Hu and published by Springer Science & Business Media. This book was released on 2010-06-30 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Electrochemistry of Flotation of Sulphide Minerals" systematically covers various electrochemical measurements, especially electrochemical corrosive methods, electrochemical equilibrium calculations, surface analysis, semiconductor energy band theory as well as molecular orbital theory. Behaviour and mechanism of collectorless and collector-induced flotation of sulphide minerals in various flotation systems are also discussed. The example of electrochemical flotation separation of sulphide ores shows an industrial application. Prof. Yuehua Hu is a professor at the School of Minerals Processing & Bioengineering of Central South University and Vice Chairman of the Mineral Processing Committee of the China Nonferrous Metals Society. Dr. Wei Sun is an associate professor at the School of Minerals Processing & Bioengineering of Central South University. Prof. Dianzuo Wang is both a member of Chinese Academy of Sciences and Chinese Academy of Engineering, and a foreign associate of the National Academy of Engineering (USA).
Download or read book The Reactions of Some Thiol Collectors at Noble metal and Pyrite Electrodes written by Dick Robert Groot and published by . This book was released on 1987 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1999 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Minerals Science and Engineering written by E. H. Wainwright and published by . This book was released on 1977 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book List of Unrestricted Mintek Publications Issued from 1966 to 1982 written by Helena Wilhelmina Glen and published by . This book was released on 1983 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication lists the 834 unrestricted reports, 449 papers, 41 patents, and 4 other technical publications that were issued as publications of the National Institute for Metallurgy (NIM) and the Council for Mineral Technology (Mintek) from 1966 (the year of NIM's inception) to 31st December, 1982. For ease of reference, these publications are also classified under research topics. Also included are details of the periodical issued by Mintek and a list of its current miscellaneous publications, which include the annual report, and brochures and leaflets of various kinds.
Download or read book The Flotation Index written by Dow Chemical Company. Great Western Division and published by . This book was released on 1975 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the South African Institute of Mining Metallurgy written by South African Institute of Mining and Metallurgy and published by . This book was released on 1976 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Galena and Associated Ore Minerals from the Cryolite at Ivigtut South Greenland written by and published by Museum Tusculanum Press. This book was released on with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reaction of Organic Compounds at the Surface of Heavy Metal Sulphides written by Alexander Felix Knoll and published by . This book was released on 1932 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Identification of Cerussite and Anglesite and Flotation with Galena written by F. D. DeVaney and published by . This book was released on 1933 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Materials and Processing Methods written by and published by . This book was released on 1934 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues for 1929- include section Contents noted (1929-1939 called Metallurgical abstracts; Jan. 1940- Sept. 1945 called Engineering digest; Oct. 1945- called Materials & methods digest) Annual indexes of the abstracts and digest were prepared 1929-1941; beginning in 1942, included in the complete index to the periodical.
Download or read book Handbook of Flotation Reagents Chemistry Theory and Practice written by Srdjan M. Bulatovic and published by Elsevier. This book was released on 2007-02-19 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Flotation Reagents: Chemistry, Theory and Practice is a condensed form of the fundamental knowledge of chemical reagents commonly used in flotation and is addressed to the researchers and plant metallurgists who employ these reagents. Consisting of three distinct parts: 1) provides detailed description of the chemistry used in mineral processing industry; 2) describes theoretical aspects of the action of flotation reagents3) provides information on the use of reagents in over 100 operating plants treating Cu, Cu/Zn, Cu/Pb, Zn, Pb/Zn/Ag, Cu/Ni and Ni ores.* Looks at the theoretical aspects of flotation reagents* Examines the practical aspects of using chemical reagents in operating plants* Provides guidelines for researchers and engineers involved in process design and development
Download or read book Application of Modern Surface Characterization Techniques to Galena PbS and Sphalerite ZnS Under Conditions Relevant to Flotation written by Ilkka Kartio and published by . This book was released on 1997 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flotation of Sulphide Minerals written by and published by . This book was released on 1985 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
