Metal Value Recovery From Metal Hydroxide Sludges
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Metal Value Recovery From Metal Hydroxide Sludges
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Author : L. G. Twidwell
language : en
Publisher:
Release Date : 1988
Metal Value Recovery From Metal Hydroxide Sludges written by L. G. Twidwell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Chromium categories.
Metal Value Recovery From Metal Hydroxide Sludges
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Author : L. G. Twidwell
language : en
Publisher:
Release Date : 1986
Metal Value Recovery From Metal Hydroxide Sludges written by L. G. Twidwell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Sewage sludge categories.
Metal Value Recovery From Metal Hydroxide Sludges
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Author : L. G. Twidwell
language : en
Publisher:
Release Date : 1988
Metal Value Recovery From Metal Hydroxide Sludges written by L. G. Twidwell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Chromium categories.
Metal Hydroxides From Electroplating
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Author : John T. Novak
language : en
Publisher:
Release Date : 1979
Metal Hydroxides From Electroplating written by John T. Novak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Heavy metals categories.
The purpose of this project was to investigate the precipitation of metals from plating facilities, to determine the dewatering characteristics of the resultant metal hydroxide slurries and to evaluate the solvent extraction process for metal recovery and reuse. Individual metals were found to precipitate according to the theoretical solubility calculations, however, mixed metals solutions containing Cr (III) often would form 'co-precipitants.' The co-precipitation would result in certain metals precipitating at pH levels below the range of predicted insolubility. Colloidal metal hydroxides remaining after settling could be removed by filtration using either a gravity filter or diatomaceous precoat pressure filter. Metal removal was effective (>95%) but the filtrate metal concentrations were not sufficiently low to meet effluent requirements. Sludges produced by hydroxide precipitation varied depending upon the pH of precipitation and the specific metals in the sludge. Sludge dewatering characteristics were found to be determined by the mean particle size of the flocs. Polymers improved dewatering rates by increasing the mean floc size. Freshly precipitated chronium hydroxide sludges were found to pass through filtering media because of floc break-up. Polymer conditioning was necessary to prevent sludge penetration through the filter media. Solvent extraction could be used to selectively extract individual metals from a mixed metal sludge but the process was not economical. (Author).
Metals Recovery From Industrial Wastewaters And Metallic Hydroxide Sludges Through Microbial Sulphate Reduction
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Author : H. J. Weyland
language : en
Publisher:
Release Date : 1977
Metals Recovery From Industrial Wastewaters And Metallic Hydroxide Sludges Through Microbial Sulphate Reduction written by H. J. Weyland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Sewage categories.
Recovery Of Metals From Sludges And Wastewaters
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Author :
language : en
Publisher: Noyes Publications
Release Date : 1993-01-01
Recovery Of Metals From Sludges And Wastewaters written by and has been published by Noyes Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-01-01 with Science categories.
State-of-the-art metals treatment and recovery technologies to assist in identifying waste management options.
Metal Removal Recovery Using Non Electrolytic Metal Recovery
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Author : Vance G. Leak
language : en
Publisher:
Release Date : 1988
Metal Removal Recovery Using Non Electrolytic Metal Recovery written by Vance G. Leak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Automobiles categories.
Metal Recovery From Industrial Waste
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Author : Clyde S. Brooks
language : en
Publisher: CRC Press
Release Date : 2018-01-18
Metal Recovery From Industrial Waste written by Clyde S. Brooks and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-18 with Technology & Engineering categories.
This book is offered as a practical primer on the hydrometallurgy of nonferrous metal reclamation from industrial wastes, as well as a brief discussion of pyrometallurgy, biological, and other separation processes. The objectives are to acquaint nontechnical readers with the subject as well as providing a detailed survey of current research and industrial practice to technical readers concerned with the management of industrial waste.
Optimum Dewatering And Metal Recovery Of Metal Plating Waste Sludges
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Author : John Holroyd
language : en
Publisher:
Release Date : 1978
Optimum Dewatering And Metal Recovery Of Metal Plating Waste Sludges written by John Holroyd and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Electroplating categories.
Bench scale experimentation was initiated to evaluate the solubilities and sludge characteristics associated with selected heavy metals and their hydroxides for both homogeneous and heterogeneous solutions. Data suggests that in a mixed-metal solution, mixed-metal co-precipitants form and the point of zero charge (PZC) for these precipitants depends upon the specific metal content of the colloidal precipitants. In general the presence of chromium (III) depresses the overall PZC while nickel and cadmium, when major waste components, tend to raise the PZC. Aging was found to impact chromium hydroxide dewatering but it is not clear that the theoretical aspects of aging chemistry can be used to predict changes. High molecular weight anionic polymers were effective in conditioning metal sludges with respect to cake formation/filtrate clarity but help dewatering rates very little. Previously developed relationships for inorganic sludges which allowed predictions about sand bed, centrifugation, and vacuum filtration dewatering processes based on gravity thickening data were found to hold for metal sludges. Based on these relationships and the laboratory data gathered here it is concluded that vacuum filtration is the only reasonable process to insure a handleable sludge. If direct reclamation of the metals from the mixed hydroxide slurry is to be attempted centrifugation may be employed. Based on a literature review and a basic economic evaluation, liquid/liquid extraction was recommended for further study as the metal recovery process of choice. (Author).
Removal And Recovery Of Metals And Phosphates From Municipal Sewage Sludge
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Author : Donald S. Scott
language : en
Publisher:
Release Date : 1980
Removal And Recovery Of Metals And Phosphates From Municipal Sewage Sludge written by Donald S. Scott and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Metals categories.