Title 14 - Flotation of Lead-Zinc Ores
Author: Bulatovic, Srdjan M
, Elsevier 2007
2007
http://www.sciencedirect.com/science/article/pii/B978044453029550023X
More details: Publisher Summary Most of the lead?��zinc ore contains silver and to a lesser degree, gold. Almost 85\% of the silver production in the world comes from lead?��zinc ores. Silver recovery in a large number of ores, specifically from South America, is emphasized, and some of these circuits were in fact designed to provide the highest possible silver recovery. The reagent scheme used in the treatment of lead?��zinc ores varies considerably and depends on the nature and mineralogy of the ore. In most cases, NaCN?��ZnSO4 depressant system is used with xanthate + dithiophosphate collectors. These reagent schemes are normally employed for treatment of carbonatite and coarse-grained massive sulfides. However, for treatment of disseminated massive sulfide ores, a much more complex reagent scheme is used. The type of reagent schemes also varies by regions, where the application of new technology (i.e., new collectors and depressants) in some regions is very slow and the operating plants rely on the old conventional processes and technology. As for copper?��zinc ores, some of the lead?��zinc ores are treated using bulk flotation followed by lead?��zinc separation.
ISBN978-0-444-53029-5
Molecular absorption spectrometry in flames and furnaces: A review
Title Molecular absorption spectrometry in flames and furnaces: A review
Author: Butcher, David J
Analytica Chimica Acta, 2013
2013
http://www.sciencedirect.com/science/article/pii/S0003267013010179
More details: Abstract Molecular absorption spectrometry (MAS), originally developed in the 1970s, is a technique to determine non-metals in flames and graphite furnaces by monitoring the absorbance of diatomic molecules. Early studies employed low resolution instruments designed for line source atomic absorption, which provided a limited choice of analytical wavelengths, insufficient spectral resolution, and spectral interferences. However, the development of high-resolution continuum source atomic absorption spectrometry (HR-CS AAS) instrumentation has allowed the analysis of challenging samples for non-metals as well as some difficult elements to determine by AAS, such as aluminum and phosphorus. In this review, theory and analytical considerations for \{MAS\} are discussed. The principles and limitations of low resolution \{MAS\} are described, along with its applications. HR-CS \{AAS\} instrumentation is reviewed, emphasizing performance characteristics most relevant for MAS. Applications of flame and HR-CS \{GFMAS\} are reviewed, highlighting the most significant work to date. The paper concludes with an evaluation of the enhanced analytical capabilities provided by HR-CS MAS. Atomic absorption spectrometry,Flame,Graphite furnace,High-resolution continuum source,Molecular absorption spectrometry
Author: Butcher, David J
Analytica Chimica Acta, 2013
2013
http://www.sciencedirect.com/science/article/pii/S0003267013010179
More details: Abstract Molecular absorption spectrometry (MAS), originally developed in the 1970s, is a technique to determine non-metals in flames and graphite furnaces by monitoring the absorbance of diatomic molecules. Early studies employed low resolution instruments designed for line source atomic absorption, which provided a limited choice of analytical wavelengths, insufficient spectral resolution, and spectral interferences. However, the development of high-resolution continuum source atomic absorption spectrometry (HR-CS AAS) instrumentation has allowed the analysis of challenging samples for non-metals as well as some difficult elements to determine by AAS, such as aluminum and phosphorus. In this review, theory and analytical considerations for \{MAS\} are discussed. The principles and limitations of low resolution \{MAS\} are described, along with its applications. HR-CS \{AAS\} instrumentation is reviewed, emphasizing performance characteristics most relevant for MAS. Applications of flame and HR-CS \{GFMAS\} are reviewed, highlighting the most significant work to date. The paper concludes with an evaluation of the enhanced analytical capabilities provided by HR-CS MAS. Atomic absorption spectrometry,Flame,Graphite furnace,High-resolution continuum source,Molecular absorption spectrometry
Thermal oxidation of indium and gallium sulphides
Title Thermal oxidation of indium and gallium sulphides
Author: Balitskii, O A; Savchyn, V P & Savchyn, P V
Physica B: Condensed Matter, 2005
2005
http://www.sciencedirect.com/science/article/pii/S0921452604011573
More details: The paper illustrates thermal oxidation of InS and GaS. Both thermodynamic calculations and experimental results suggest the formation of a monophase oxide layer. Such oxidation processes are not typical for the other compounds in the III?��VI system, where the native oxide film is another chalcogen compound with a formula like ( A 2 \{III\} B 3 \{VI\} ) enriched. GaS,III?��VI compound,InS,Thermal oxidation
Author: Balitskii, O A; Savchyn, V P & Savchyn, P V
Physica B: Condensed Matter, 2005
2005
http://www.sciencedirect.com/science/article/pii/S0921452604011573
More details: The paper illustrates thermal oxidation of InS and GaS. Both thermodynamic calculations and experimental results suggest the formation of a monophase oxide layer. Such oxidation processes are not typical for the other compounds in the III?��VI system, where the native oxide film is another chalcogen compound with a formula like ( A 2 \{III\} B 3 \{VI\} ) enriched. GaS,III?��VI compound,InS,Thermal oxidation
Emanation thermal analysis
Title Emanation thermal analysis
Author: Balek, Vlad\'{\i}mir
Thermochimica Acta, 1978
1978
http://www.sciencedirect.com/science/article/pii/004060317880001X
More details:
Author: Balek, Vlad\'{\i}mir
Thermochimica Acta, 1978
1978
http://www.sciencedirect.com/science/article/pii/004060317880001X
More details:
Study of the new $\beta$-In2S3 containing Na thin films. Part II: Optical and electrical characterization of thin films
Title Study of the new $\beta$-In2S3 containing Na thin films. Part II: Optical and electrical characterization of thin films
Author: Barreau, N; Bern\`{e}de, J. C. & Marsillac, S.
Journal of Crystal Growth, 2002
2002
http://linkinghub.elsevier.com/retrieve/pii/S0022024802012435
More details: The optical and electrical properties of the new [In16]Oh[In5.33-xNa3x?��2.66- 2x]TdS32 (BINS) thin films have been studied. The determination of the optical band gap of films containing different rates of sodium has shown that it linearly increases from 2.10 eV, when the films are pure $\beta$-In2S3, to 2.95 eV, when their sodium content corresponds to x .9 i.e. [In16]Oh[In4.4Na2.7?��0.9]TdS32 compound. This evolution of the band gap has been discussed in terms of In-S bond length and electronegativity of Na and In elements. All the BINS thin films have an n-type electrical conductivity, which decreases from 4 ?� 10-7 to 10-7 S cm-1 when x increases from 0.05 to 0.9, respectively. The electrical conductivity of pure $\beta$-In2S3 has been found around 2 ?� 10-8 S cm-1, which is lower than that of films containing sodium. The variation of the room conductivity of the films is related to the sodium distribution in the crystalline structure. ?? 2002 Elsevier Science B.V. All rights reserved.A1. Electrical properties,A1. Optical properties,A3. Physical vapor deposition processes,B1. New materials,B2. Semicinducting materials,B3. Optoelectronical devices
ISBN3325112552
Author: Barreau, N; Bern\`{e}de, J. C. & Marsillac, S.
Journal of Crystal Growth, 2002
2002
http://linkinghub.elsevier.com/retrieve/pii/S0022024802012435
More details: The optical and electrical properties of the new [In16]Oh[In5.33-xNa3x?��2.66- 2x]TdS32 (BINS) thin films have been studied. The determination of the optical band gap of films containing different rates of sodium has shown that it linearly increases from 2.10 eV, when the films are pure $\beta$-In2S3, to 2.95 eV, when their sodium content corresponds to x .9 i.e. [In16]Oh[In4.4Na2.7?��0.9]TdS32 compound. This evolution of the band gap has been discussed in terms of In-S bond length and electronegativity of Na and In elements. All the BINS thin films have an n-type electrical conductivity, which decreases from 4 ?� 10-7 to 10-7 S cm-1 when x increases from 0.05 to 0.9, respectively. The electrical conductivity of pure $\beta$-In2S3 has been found around 2 ?� 10-8 S cm-1, which is lower than that of films containing sodium. The variation of the room conductivity of the films is related to the sodium distribution in the crystalline structure. ?? 2002 Elsevier Science B.V. All rights reserved.A1. Electrical properties,A1. Optical properties,A3. Physical vapor deposition processes,B1. New materials,B2. Semicinducting materials,B3. Optoelectronical devices
ISBN3325112552
Bandgap properties of the indium sulfide thin-films grown by co-evaporation
Title Bandgap properties of the indium sulfide thin-films grown by co-evaporation
Author: Barreau, N; Mokrani, A; Couzini\'{e}-Devy, F. & Kessler, J
Thin Solid Films, February 2009
2009
http://linkinghub.elsevier.com/retrieve/pii/S0040609008013588
More details:
Author: Barreau, N; Mokrani, A; Couzini\'{e}-Devy, F. & Kessler, J
Thin Solid Films, February 2009
2009
http://linkinghub.elsevier.com/retrieve/pii/S0040609008013588
More details:
Elements of group 6
Title Elements of group 6
Author: Barker, M G
Coordination Chemistry Reviews, 1975
1975
http://www.sciencedirect.com/science/article/pii/S0010854500804713
More details:
Author: Barker, M G
Coordination Chemistry Reviews, 1975
1975
http://www.sciencedirect.com/science/article/pii/S0010854500804713
More details:
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