Pierre concasseur

Produits /

Voici notre produit

depression de pyrite redox potentielle

  • Flotation and depression control of arsenopyrite

    Flotation and depression control of arsenopyrite through pH and pulp redox potential using xanthate as the collector Article in International Journal of Mineral Processing 81(1):27-34 · October

  • The depression of pyrite in selective flotation by

    The depression of pyrite flotation by cyanide may result from one or more of the following mechanisms: (1) Cyanide may depress pyrite flotation by replacing xanthate ions on pyrite surface, similar to hydroxyl ions (Wark and Cox, 1934, Prestidge et al., 1993).

    • Cited by: 65
  • (PDF) Pyrite Flotation: A Review ResearchGate

    Pyrite mine rals are either n-type (sulfur d eficit pyrit e) or p-type semic onductors. Typically p-ty pe pyrites exh ibit low cond uctivities and are As- rich, an im portant mino r element of py

  • Surface Oxidation of Pyrite as a Function of pH

    Pyrite, the most abundant metal sulfide at the surface of Earth, plays a key role in many processes such as acid mine drainage, redox cycling of metals at oxic-anoxic boundaries of lake bottom, and degradation of pollutants. The oxidation of pyrite was studied in batch experiments over a large range of pH (2.5−12), with trace oxygen. Surface analysis of the samples was performed using X-ray

  • (PDF) Flotation and depression control of

    Flotation and depression control of arsenopyrite through pH and pulp redox potential using xanthate as the collector

  • A study on the effect of active pyrite on flotation of

    against pyrite (Qiu et al., 2017). Li et al. (2012) investigated the depression of pyrite in alkaline medium using NaOH and CaO and its subsequent activation by copper. The results showed that the Cu activation of pyrite after depression using CaO was more difficult than that after depression

  • Flotation and depression control of arsenopyrite

    Flotation and depression control of arsenopyrite through pH and pulp redox potential using xanthate as the collector. Further upgrading is accomplished through pyrite flotation and arsenopyrite depression. In base metal sulfide ores, The collector, sodium isopropyl xanthate, was obtained from Industrias Quimicas de Mexico.

    • Cited by: 25
  • Effect of redox conditions and copper ions on

    Redox conditions and chemical reactions involved in depression mechanisms of pyrite by MBS, or sodium sulfite, in seawater are investigated and discussed based on the acidifying effect of MBS, oxidation of sulfite ions by dissolved oxygen, and the role of catalyst of some metal cations (e.g., copper ions) adsorbed on pyrite’s surface.

  • Study on Selective Depression of Pyrite during

    During Zijinshan copper heap bioleaching, pyrite was leached in plenty resulting in high ferric concentration in solution. This affected bioleaching and extraction processing greatly. The paper studied the factors influencing in the course of leaching of pyrite and a mixture of chalcocite and pyrite respectively. It focuses on the effect of the redox potential for copper bioleaching so as to

    • Cited by: 3
  • Liste de potentiels standard — Wikipédia

    température de 25 °C ; concentration effective à 1 mol/L pour chaque espèce aqueuse ou pour chaque espèce dans un amalgame de mercure ; pression partielle à 101,325 kPa (absolu) (1 atm ou 1,01325 bar ) pour chaque réactif gazeux.

  • Electrochemical and spectroscopic studies of

    Preferential adsorption of cyanide on pyrite rather than the decrease of surface redox potential was determined to be the depression contributor. Surface cyanoferric species were identified, both electrochemically and spectroscopically, on pyrite surface in the presence of cyanide, inhibiting the oxidation of pyrite and the oxidation/chemisorption of xanthate.

  • jstage.jst.go.jp

    Japan's largest platform for academic e-journals: J-STAGE is a full text database for reviewed academic papers published by Japanese societies

  • REDOX CONDITIONS IN THE SELECTIVE FLOTATION OF ENARGITE

    +325mV chalcocite and pyrite were completelly depressed. Chalcopyrite was also partially depressed at higher potentials. Consequently, the selective flotation of enargite from Cu and Fe sulfides is technically feasible by regulation of redox conditions of the pulp. Results are interpreted on the basis of Eh-pH diagrams.

  • Selective Depression Scientific.Net

    Home Selective Depression. Papers by Keyword: Selective Depression. Paper Title Page. Study on Selective Depression of Pyrite during Copper Bioleaching. Authors: Ren Man Ruan, Gui Ying Zhou,

  • Oxidative Depression of Arsenopyrite by Using

    During smelting, arsenic in copper concentrates affects the product quality and causes environmental pollution. Removing arsenic minerals from copper concentrates requires environmental-friendly and cost-effective depressants for flotation separation. Ca(ClO)2 was combined with sodium humate (SH) to improve the flotation separation of chalcopyrite from arsenopyrite.

  • Electrochemical properties of pyrite, pyrrhotite, and

    pyrite and pyrrhotite from other sulphide minerals. Understanding of activation and depression of sulphide minerals, such as pyrite and pyrrhotite, as well as grinding media such as steel balls, under both acidic and alkaline conditions, is necessary to improve recovery and to design process strategies for cost reduction. These parameters can

  • Electrochemistry of Pyrite and its Significance in

    Electrochemistry of Pyrite. Measurements of the redox potential of xanthate-dixanthogen systems were attempted to get a fundamental background on xanthate oxidation. The depression of pyrite with cyanide in the flotation system can be achieved in two ways.

  • The Role of Lime in Xanthate Flotation of Pyrite

    The depression of pyrite with lime in xanthate flotation was investigated by means of flotation tests, adsorption studies and electrokinetic potential measurements. The results obtained are summarized as follows: 1. In xanthate flotation of pyrite, lime is more effective than sodium hydroxide as a depressant. 2.

  • Electrochemical and spectroscopic studies of pyrite

    Electrochemical and spectroscopic studies of pyrite–cyanide interactions in relation to the depression of pyrite flotation

  • IMPACT OF OVALBUMIN ON PYRITE FLOTATION IN THE

    metals display synergetic effect with OVA on pyrite depression, whereas noble metals activate pyrite and reduced depressing potency of OVA. Keywords: pyrite, ovalbumin, metal ion, flotation, redox potential Introduction Pyrite (FeS2) is the most widespread sulfide mineral in earth crust.

  • Mechanism of sodium sulfide on flotation of cyanide

    explain pyrite depression by cyanide. WANG and FORSSBERG [8] found that cyanide was preferentially adsorbed on pyrite surface as iron cyanide compounds, inhibiting the chemisorption and oxidation of xanthate on pyrite and pyrite flotation. However, de WET et al [9] suggested that cyanide hindered the electrochemical activities and

  • Pyrite Passivation by Triethylenetetramine: An

    The potential of triethylenetetramine (TETA) to inhibit the oxidation of pyrite in H 2 SO 4 solution had been investigated by using the open-circuit potential (OCP), cyclic voltammetry (CV), potentiodynamic polarization, and electrochemical impedance (EIS), respectively. Experimental results indicate that TETA is an efficient coating agent in preventing the oxidation of pyrite and that the

    • Locatie: 8600 Rockville Pike, Bethesda, MD
  • Effects of pH and pulp potential on selective separation

    Effects of pH and pulp potential on selective separation of Molybdenite from the Sungun Mine Cu-Mo concentrate Javad Vazife Mehrabani a, *, Parviz Pourghahramani a, Hadi Asqarian a, Asghar Bagherian b depression of chalcopyrite, a considerable amount of Na 2 S/NaSH is required.

  • Flotation separation of chalcopyrite from galena by sodium

    Flotation separation of chalcopyrite from galena by sodium humate and ammonium persulfate Rui-zeng LIU 1, Wen-qing QIN 1, Fen JIAO,Xing-jie WANG,Bin PEI2, Yong-jun YANG2, Chun-hua LAI3 1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; 2.

  • Effect of redox conditions and copper ions on

    Points saillants des réunions du conseil d'aministration de l'ICM Fondation ICM Bureau national GMPA Historique Ce que nous faisons. Événements. Publications. Perfectionnement professionnel. Le programme des éminents conférenciers

  • The Effect of Oxidation on the Flotation Behaviour of

    Process pH Dissolved 02 Redox ('To sat) Potential, mY-SHE Tune--.. before after before after before after Grinding 7.7 8.1 75-80 4-8 334 221 <H2O) Flotation 9.2 8.3 80-85 99-100 215 240 TABLE lb Typical conditions ofthe testwork using stainless steel/nitrogen. Process pH Dissolved Ch Redox (% sat) Potential, mY-SHE Tune--.. before after before

  • An investigation of pyrite depression in coal

    4-5-2020· This paper introduces a new potential method of pyrite depression in the flotation of high sulfur coal based on the electrochemical pyrite surface control. Experimental date show that the natural hydrophobicity of pyrite depends on the oxidation-reduction potential of the pulp. The mechanism and

  • On the other hand it seems that pyrite is more

    On the other hand it seems that pyrite is more susceptible to be depressed at from METALLURGY 100 at University of Concepción, Concepción

  • pyrite oxidation central thebushlodge.co.za

    Pyrite Depression By Reduction Of Solution Oxidation Potential----- PYRITE DEPRESSION BY REDUCTION OF SOLUTION OXIDATION POTENTIAL Department of Mineral Engineering University of Utah Salt Lake City, Utah 84112 for ENVIRONMENTAL PROTECTION AGENCY WATER QUALITY OFFICE Grant Number 12010 DIM December, 1970.

  • Flotation of sphalerite and pyrite in the presence of

    promotes the oxidation of copper on pyrite as copper hydroxide, but has no effect on sphalerite. This increase in the amount of oxidation products on the pyrite surface and, as a result, decrease in xanthate adsorption may explain the depression of the flotation of pyrite in the presence of sodium sulfite. q2001 Elsevier Science B.V.

    • Articles connexes