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Thursday, May 21, 2020 | History

2 edition of Deactivation of Pb-contaminated sphalerite by polyphosphate found in the catalog.

Deactivation of Pb-contaminated sphalerite by polyphosphate

Fereshteh Rashchi

Deactivation of Pb-contaminated sphalerite by polyphosphate

by Fereshteh Rashchi

  • 11 Want to read
  • 31 Currently reading

Published by McGill University in Montréal, Qué .
Written in English

    Subjects:
  • Sphalerite

  • Edition Notes

    Statement by Fereshteh Rashchi.
    Classifications
    LC ClassificationsTN"523"R38"2000
    The Physical Object
    Paginationxviii, 176 l. :
    Number of Pages176
    ID Numbers
    Open LibraryOL22169444M

    Effect of polyphosphate and naphthalene sulfonate formaldehyde condensate on the rheological properties of dewatered tailings and cemented paste backfill [] Effect of surface oxide/hydroxide products on the collectorless flotation of copper-activated sphalerite. (). Activation and deactivation studies with copper on sphalerite. (). Activation and flotation of sulphide minerals. (). Activation of zinc sulphide with Cu II), Cd(II), and Pb(II): III. The mass spectrometric determination of elemental sulphur. ().

      Polyphosphate Research • Sequestering of metals depends on water chemistry (Klueh & Robinson, ) • Reduces apparent color and turbidity in Fe. 3+ colloids (Lytle, ) • Polyphosphates improve disinfection (LeChevallier, ) Application results in 1, fold decrease in biofilm counts • Revert to ortho over time (Thilo, Chem, ). Dilute Phosphate Buffered Saline (PBS - 20X) to a 1X solution using ddH2O. This product supplies enough 20X material to make 20 liters of 1X solution. Storage. Supplied as a 20X solution. Store at room temperature. Product Description. Phosphate Buffered Saline (PBS) formulated to be used as a buffer for ELISA. 1 X PBS contains mM Na2HPO4.

      Polymeric materials are often used in pharmaceutical packaging, delivery systems, and manufacturing components. There is continued concern that chemical entities from polymeric components may leach into various dosage forms, particularly those that are comprised of liquids such as parenterals, injectables, ophthalmics, and inhalation products. pH Ranges for Sequential Cu Pb Zn Flotation | Separation. Previous Next View Larger Image. To understand froth (Galena) and Zinc (Sphalerite) as well as iron (pyrite/arsenopyrite) minerals VS pH. With a slurry’s natural pH is 9, it becomes clear Cu/Pb/Zn cannot be separated from each other nor from Fe. At pH 9 now, most of all metals.


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Deactivation of Pb-contaminated sphalerite by polyphosphate by Fereshteh Rashchi Download PDF EPUB FB2

Of the candidate reagents (deactivators) tried, microflotation showed polyphosphate had the strongest deactivation effect on Pb-contaminated sphalerite at near neutral conditions. The presence of up to ppm calcium had little impact, but polyphosphate was more effective when added prior to xanthate.

by: 9. Deactivation of Pb-contaminated sphalerite by polyphosphate Article in Colloids and Surfaces A Physicochemical and Engineering Aspects () March with. The mechanism of polyphosphate action was investigated by SEM and XPS.

The results show that polyphosphate acted to remove Pb ("clean") from the sphalerite by forming soluble polyphosphate (PP) to lead (Pb) ratio in the complexes was determined from conductometric titration of lead nitrate vs.

: Fereshteh. Rashchi. Fig. 1 shows the recovery at flotation pH 9 as a function of contamination pH. Without collector, sphalerite did not float appreciably over the pH range 4–9 with or without Pb.

In the presence of xanthate, with no Pb sphalerite recovery was slightly elevated at pH below 6, consistent with the findings of others Trahar et al.,Guy and Trahar,Girczys and Laskowski,an effect Cited by: Pages (15 March ) Download full issue.

Previous vol/issue. select article Deactivation of Pb-contaminated sphalerite by polyphosphate. Research article Full text access Deactivation of Pb-contaminated sphalerite by polyphosphate. Rashchi, J.A.

Finch. Pages Download PDF. Sphalerite is commonly floated in an alkaline environment and under such conditions the overall activation mechanism is obscured by the hydrolysis of Cu2+ and precipitation of Cu(OH)2.

Deactivation of Pb-contaminated sphalerite by polyphosphate. Article. Mar ; (NaHCO3), silica sol (SS), sodium phosphate (Na3PO412H2O) and sodium polyphosphate (PP).

The latter showed the. Sphalerite activation and surface Pb ion concentration. Similar sphalerite contamination was reported by other researchers in galena–sphalerite flotation separation (Basilio et al.,Rashchi and Finch, ) albeit without chitosan. The contamination of sphalerite surface by the lead ions at the test pH (pH 4).

It deactivates sphalerite flotation by substituting the activating metal ions, and depresses sphalerite flotation by forming hydrophilic coatings of zinc hydroxyl species on sphalerite surfaces. The calculation of sphalerite was based on the zinc blende structure whose space group was Fm.

The cell parameters were a = b = c = Å, α = β = γ = 90°.The sphalerite (1 1 0) surface has undergone considerable relaxation, resulting in the lowest surface free energy, which was proved by using X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED).

2) C Sui, Fereshteh Rashchi, Je Nesset, and Ja Finch. "Interactions in the sphalerite - Ca - SO4 - CO3 systems." COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTSno. 1 (): 3) Fereshteh Rashchi. "Deactivation of Pb-contaminated Sphalerite by Polyphosphate." COLLOIDS AND SURFACES.

Rashchi, J.A. Finch, Deactivation of Pb-contaminated sphalerite by polyphosphate., Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol No, A.

Mellah, D. Benachour, Solvent extraction of heavy metals contained in phosphoric acid solutions by 7-(4-ethylmethyloctyl)hydroxyquinoline in kerosene diluent. The role of copper ions in sphalerite and pyrite flotation selectivity Felsher, Dave. Electrowinning of metal - DETA complexes Rashchi, Fereshteh.

Deactivation of Pb-contaminated sphalerite by polyphosphate Zhang, Yongqin, Single bubble velocity profile: experiments and numerical simulation DiFeo, Anthony. C Sui, Fereshteh Rashchi, Je Nesset, and Ja Finch.

"Interactions in the sphalerite - Ca - SO4 - CO3 systems." COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTSno. 1 (): Fereshteh Rashchi. "Deactivation of Pb-contaminated Sphalerite by Polyphosphate.". The optimal polyphosphate dosage, pH and contact time were found to be 22–28 mg/L of polyphosphate as P, 9–10, and 36 h, respectively.

The highest total copper release reduction was. DeepDyve is the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Sodium Metabisulfite aka MBS is used for pH control in froth flotation to control Pyrite depression. Below is a graph showing pH VS pyrite recovery at various collector addition rates. It is also used to prevent flotation of sphalerite by copper activation in the presence of Tennantite/Covellite in the ore.

For pyrite flotation, you see maximum iron/pyrite depression using Sodium Metabisulfite. Sphalerite activation by lead ions is well known and dealt with by the addition of zinc sulphate. Entrainment is a phenomenon based on particle size compounded by froth 'stickiness'/draining capacity - and is not ore or mineral specific.

The addition of a very small quantity of sodium hydrosulphide during milling will precipitate any base metal.

Minerals Engineering International: Metallic Ores: Zinc. Jian Liu, Majid Ejtemaei, Anh V. Nguyen, Shuming Wen, Yong Zeng, Surface chemistry of Pb-activated sphalerite, Minerals Engineering, Vol. Xiaoping Huang, Yun Jia, Zhanfang Cao, Shuai Wang, Xin Ma, Hong Zhong, Investigation of the interfacial adsorption mechanisms of 2-hydroxyethyl dibutyldithiocarbamate surfactant on galena and.

Minerals Engineering International: Froth Flotation. Walker, A., and Wheelock, T.D., Separation of carbon from fly ash using froth flotation, Coal Preparation, Vol No.4, K. Fa, A.V. Nguyen and J.D. Miller, Interaction of calcium dioleate collector colloids with calcite and fluorite surfaces as revealed by AFM force measurements and molecular dynamics simulation, International Journal.Brominated Flame Retardants - Substance Flow Analysis and As-sessment of Alternatives Carsten Lassen and Søren Løkke COWI A/S Lina Ivar Andersen Danish Institute of Fire Technology Environmental Project Nr.

Miljøprojekt. The Danish Environmental Protection Agency will. Polychlorinated biphenyls (PCBs), a class of hazardous pollutants, are difficult to dissipate in the natural environment.

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