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Wednesday, July 29, 2020 | History

2 edition of 2/O2 as an oxidant in hydrometallurgy found in the catalog.

2/O2 as an oxidant in hydrometallurgy

Wensheng Zhang

2/O2 as an oxidant in hydrometallurgy

by Wensheng Zhang

  • 378 Want to read
  • 19 Currently reading

Published in Murdoch University .
Written in English

    Subjects:
  • Hydrometallurgy,
  • Sulphur dioxide -- Oxidation,
  • Iron -- Metallurgy -- Oxygen processes

  • Edition Notes

    StatementWensheng Zhang.
    Classifications
    LC ClassificationsTN"688"Z43"2000
    The Physical Object
    Paginationxvii, 248p. :
    Number of Pages248
    ID Numbers
    Open LibraryOL22152940M

    Oxidant is a key issue for CMP of single crystal diamond. In this study, five different oxidants were used to polish diamond samples. The results indicated that Fenton reagent was an appropriate CMP oxidant and a super-smooth diamond surface of Ra nm was achieved by using Fenton reagent in CMP. Hydrometallurgy , 11 (3), DOI: /X(83) Iwao Tsukahara, Minoru Tanaka. Determination of gold in silver, copper, lead, selenium and .

    The leaching of gold, silver and base metals from a sulfidic gold ore in the presence of an oxidant (peroxomonosulfate (HSO5-) or iron(III)) and leaching agent (thiourea, chloride, bromide or iodide) is compared in 1-butylmethylimidazolium hydrogen sulfate (bmimHSO4) and chloride (bmimCl) ionic liqs., as well as in aq. satd. K2SO4 as the.   The use of Pt IV as a stoichiometric oxidant in the Shilov reaction represents a significant drawback that has been difficult to address. 6 Oxidants that are commonly used in PdII/PdIV-catalyzed reactions, such as PhI(OAc) 2, diaryliodonium salts, N-bromosuccinimide, and electrophilic fluorine reagents, 7 are more user friendly (e.g., soluble in organic solvents) and less expensive than Pt IV.

    4Au + 8S2 O3 2− + O2 + 2H2 O ↔ 4Au(S2 O3)2 3− + 4OH− () The associated Pourbaix diagrams for thiocyanate and thiosulfate are presented in Figure and Figure , respectively. Both thiocyanate and thiourea leaching are performed in acidic media. In contrast, leaching with thiosulfate is generally performed in alkaline media.   The Pd(OAc)2/O2/DMSO catalyst system displays impressive versatility in the aerobic oxidation of organic substrates, ranging from alcohols to olefins. This report details mechanistic insights into these reactions. Dimethyl sulfoxide (DMSO) plays no redox role in the chemistry, and kinetic experiments identify the turnover-limiting step as DMSO-promoted oxidation of palladium(0) by .


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2/O2 as an oxidant in hydrometallurgy by Wensheng Zhang Download PDF EPUB FB2

Oxygen mixed with SO 2 can function as a powerful oxidant in acid solution. This paper summarises basic studies on the mechanism of SO 2 /O 2 oxidation, the kinetics of oxidation in acidic media, and potential applications in hydrometallurgy.

The SO 2 /O 2 system readily oxidises Fe(II) to Fe(III) and provides a simple method of regenerating Fe(III) for leaching minerals like Cu 2 S or U 3 O by:   SO2/O2 as an oxidant in hydrometallurgy.

(OH)2 + O2, for the SO32− must be involved in the stoichiometry of the overall reaction by producing, in the. Oxygen mixed with SO2 can function as a powerful oxidant in acid solution. This paper summarises basic studies on the mechanism of SO2/O2 oxidation, the kinetics of oxidation in acidic media, and potential applications in hydrometallurgy.

The SO2/O2 system readily oxidises Fe(II) to Fe(III) and provides a simple method of regenerating Fe(III) for leaching minerals like Cu2S or by: A novel oxidant for nickel hydrometallurgy.

Article (PDF Available) (OH)2 + O2, for the SO32− must be involved in the stoichiometry of the overall reaction by producing, in the initial phase. Nickelic hydroxide is an important metallurgical reagent used for precipitating cobalt from nickel sulfate solutions.

Existing methods of preparation of nickelic hydroxide involve electrolytic oxidation of Ni(OH) 2 or the use of strong oxidizing agents such as chlorine, ozone and persulfate. The present paper describes a new method for chemical preparation of nickelic hydroxide, developed in Cited by:   Hydrometallurgy, 4: Nickelic hydroxide is an important metallurgical reagent used for precipitating cobalt from nickel sulfate solutions.

Existing methods of preparation of nickelic hydroxide involve electrolytic oxidation of Ni(OH)2 or the use of strong oxidizing agents such as chlorine, ozone and persulfate. Martin B. Hocking, in Handbook of Chemical Technology and Pollution Control (Third Edition), Basic Principles.

Hydrometallurgy refers to the application of aqueous solutions for metal recovery from ores, and has been practiced for copper recovery for many years. The original impetus for solution methods for copper extraction before the development of froth flotation technology was.

Journals & Books; Help Download PDF Advanced. Hydrometallurgy. VolumeMayPages Review. Chalcopyrite hydrometallurgy at atmospheric pressure: 2. Review of acidic chloride process options. Author links open overlay seawater appears to be as efficient a solvent and carrier of acid and oxidant as freshwater.

The recent. In book: Recent Researches in Metallurgical Engineering - From Extraction to Forming. Cite this publication. sea manganese nodules as oxidant, Hydrometallurgy, 77,().

Highlights Thermodynamic analysis of (Au, Ag, Cu, Fe)-SCN-H 2 O systems was performed. The findings are useful in understanding the leaching and recovery of gold. Gold can be leached in thiocyanate solutions with ferric sulfate as the oxidant. Gold forms aurous or auric complexes with thiocyanate.

Ferric ion forms a series of cationic or anionic complexes with thiocyanate. As the first book to compile the fundamentals, applications, reference information and analytical tools on the topic, Hydrometallurgy presents a condensed collection of information that can be.

In this work is evaluated the bioleaching capacity of a bacterium isolated from a mine in Guanajuato, México, namely LR The bacterium oxidized Fe 2+ and S 2 O 3 2− at acidic pH for its energy metabolism.

This oxidant activity provided Fe 3+ and/or protons that provoke sulfide ore dissolution. Five sulfide ore samples were obtained from different Mexican mines: Remedios, Guerrero. Iron(III) can be used as an oxidant in the leaching of uranium ore in an acid medium.

The oxidation of iron(II) to iron(III) using an SO2/O2 gas mixture was investigated in order to provide an. Ferric sulfate Fe 2 (SO 4) 3, ammonium persulphate (NH 4) 2 S 2 O 8, and potassium permanganate KMnO 4 at different concentrations were used as oxidants in different variants of the experiment.

In addition, solutions collected at Vostok deposit containing g/L Fe 3+ and 10 6 cells/mL of the bacteria Acidithiobacillus ferrooxidans were used. An Introduction to Oxidation-Reduction Reactions ObjeCtive 2 ObjeCtive 2 Zinc oxide is a white substance used as a pigment in rubber, sun‑blocking ointments, and paint.

A Text book of Hydrometallurgy, Me´tallurgie Extractive Que´bec, Sainte Foy, Quebecsecond editiondistributed by Laval University Bookstore bZoneQ. Halil Y., Mustafa G., Separation and recovery of silver(I) Ions from Base metal ions by.

Mubarok et al. (), who used similar experimental setup to study direct oxidative leaching of sphalerite concentrates using ozone as oxidant, reported that the ozone content in the gas stream.

using strong oxidants to encourage the dissolution of gold in aqueous medium is important. So some oxidants such as hydrogen peroxide and chlorine gas was used Hydrometallurgy. 52, pp. 81 Donmez, B., Sevim, F.

and Colak, S. () A Study on Recovery of Gold from Decopperized Anode Slime. Chem. Eng. Download Citation | OnC. Gupta and others published Hydrometallurgy in Extraction Processes | Find, read and cite all the research you need on ResearchGate.

ACCOUNTS OF CHEMICAL RESEARCH Vol. 45, No. 6 Overcoming the “Oxidant Problem” Campbell and Stahl nucleophilicattackonanallyl-PdII intermediate,anditalsoserves as the stoichiometric oxidant in the conversion of Pd 0 to PdII (Scheme 3) We speculated that an ancillary ligand could be used to destabilize the allyl-Pd II intermediate and enable reduc.

A less harmful approach for the environment regarding chalcopyrite concentrate leaching, using seawater/brine and caliche’s salts as a source of chloride and nitrate ions, was investigated.

Different variables were evaluated: sulfuric acid concentration, sodium nitrate concentration, chloride concentration, source of water (distilled water, seawater, and brine), temperature, concentrate.

B. Pesic and F. A. Olson, “Dissolution of Bornite in Sulfuric Acid Using Oxygen as Oxidant,” Hydrometallurgy, 12,pp. – Article Google Scholar. How Oxidants Work. An oxidant is a chemical species that removes one or more electrons from another reactant in a chemical reaction.

In this context, any oxidizing agent in a redox reaction may be considered an oxidant. Here, the oxidant is the electron receptor, while the reducing agent is the electron donor.