Pyrite Depression By Reduction Of Solution Oxidation Potential

WATER POLLUTION CONTROL RESEARCH SERIES • 12010 DIM 08/70 Pyrite Depression by Reduction of Solution Oxidation Potential ENVIRONMENTAL PROTECTION AGENCY • WATER QUALITY OFFICE...

the effect of sulphite on the xanthate-induced ... - ResearchGate

sodium bisulphite interacted with the pyrite surface, as well as with isobutyl xanthate in solution and its adsorbed state. ... depression including the formation of a metal sulphite hydrophilic surface layer and consumption of .... During all flotation tests, a decrease in Eh of 40 mV was observed after sodium sulphite addition,.

The surface and solution chemistry of pyrite flotation with xanthate in ...

depression [15-17]. It can be seen from the figure that in alkaline solutions of pH 9-10 the presence of ferric iron does not substantially affect the flotation of ..... reduced. These results are in excellent agreement with the flotation results in the presence of ferrous ions ( Fig. 6). 3.4. Ttwrmodynanlics of pyrite-xanthate system.

Pyrite Depression - Froth Flotation (Sulphide & Oxide) - Metallurgist ...

Pyrite Depression (23 replies) .... Slaked lime solution is used in Rougher and more in cleaner, along with NaCN dosage, to depress PYRITE. ... If copper is replaced by other reagents to carry out pre activation then copper consumption is reduced and hence any inadvertent activation of pyrite is eliminated leading to...

Pyrite Depressant - Froth Flotation (Sulphide & Oxide) - Metallurgist ...

I am currently undertaking a project on the depression of pyrite, am trying to use aeration and milling at high pH. It's proving to ... Oxidising the iron sulphide will probably reduce your recovery as it would be hard to not oxidise any of the CuS minerals. ... Go to Google search and type pyrite depression you get the solution.

depression of pyrite in the flotation of copper ores - Research ...

Pyrite flotation could also be reduced with addition of xanthate during grinding. In this case, the selective depression of pyrite flotation was attributed to the immobilisation of copper by xanthate at the chalcopyrite surface or its removal from solution, both mechanisms resulting in a reduced copper activation of pyrite. Pyrite.

Influence of the Interaction between Sphalerite and Pyrite on ... - MDPI

Jan 12, 2018 ... selective flotation of sphalerite, pyrite is usually depressed by using lime. In alkaline ... activation of pyrite will reduce the difference in flotation performance between sphalerite and pyrite, and cause a ... solution, but the activation rate was unchanged when the ratio of surface areas was equal to 1:1 [19,20].

depression of pyrite mineral with cyanide and ferrous/ferric salts

show that all tested depressants reduce the collection ability of pyrite with K-butyl xanthate ... The problem of pyrite depression with cyanide type reagents, alkaline ... The results of pyrite floatability in solutions of various concentrations of. KBX collector (from 1 mg/l to 15 mg/l) are shown on Figure 1. The results of pyrite.

Effect of solution conditions on depression of chlorite using CMC as ...

Apr 9, 2013 ... The two kinds of solution switches (reducing the solution pH or increasing ionic concentration) result in an increased depression effect of CMC on chlorite flotation, as a result of conformational change of CMC pre-adsorbed layer. The change in the flotation recovery of the CMC-coated chlorite following the...

Pyrite Flotation With Xanthate Under Alkaline Conditions ...

strongly depressed, independently of the concentration in xanthate. In this ... aim at preventing oxidation of pyrite, by reducing the presence of ..... A hydrophobicity/hydrophilicity ratio could be estimated to identify the steps leading to pyrite flotation in alkaline solution. Pyrite-oxygen interaction: production of reactive sites.

Froth Flotation in Saline Water - J-Stage

solutions, is especially suitable for theoretical analysis since no other organic agents are used in it. Starting from this example, the case of flotation of sulfide ores (chalcocite, chalcopyrite, pyrite and molybdenite) is discussed. The flotation .... hydrophobic particles to bubbles is reduced making attachment possible;. (ii) At the...

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Article (PDF)

Aug 14, 2014 ... NaCN, and even more the combination of reagents FeSO4/NaCN are more successful in pyrite depression than complex ... Keywords: pyrite, flotation, ferrous sulphate, cyanide salts, depression. Introduction .... decrease of flotation recovery in acidic pH range (pH 5–7), while in solutions of pH above 7, a...

FTIR and XPS studies of surface chemistry of pyrite in flotation - OSTI

Dec 31, 1995 ... Presently, separation of pyrite by flotation is becoming more and more important for reduction of sulfur in coal. In this work Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) were used to study the surface chemistry of pyrite in depression, activation and xanthate...

Surface Chemical Studies on Pyrite in the Presence of ...

measurements indicate a decrease in the electrophoretic mobility values in ... depression of pyrite encompass each other. XPS and .... in 100 ml solution. The desired pH was adjusted by adding ei- ther nitric acid or potassium hydroxide solution. After 30 min, the solution was centrifuged at 5000 rpm for 10 min in a Remi.

Electrochemical characteristics of iron sulfide minerals in the ...

that of pyrite. Results are discussed in relation to flotation/depression behavior of these iron sulphide minerals in mineral separation processes. KEYWORDS. Electrochemistry, Flotation ... attempt to increase sustainability, mining industries are seeking for solutions to reduce reliance on fresh water resources, traditionally...

The interactive effects of the sulphite ion, pH, and dissolved ... - SAIMM

Jan 1, 1985 ... the recovery of chalcopyrite decreased, while galena was slightly depressed at low concentrations of dissolved oxygen. At higher sodium sulphite .... 9-Effect of pH regulators on the rest potential of chalco- pyrite. X2/X-reduction potentials: solution' . . .pulp ---. 300. Pulp. Solution. H2S03. 0. H2S04. 0. HCl. A.

Challenges in Sulphide Mineral Processing

schemes of ore processing, in particular froth flotation towards reducing overall costs, limiting the use of dangerous substances ... opportunities in controlling mineral–solution interfaces towards the grand challenge of tomorrow's science and mineral .... been proposed for depression of pyrite flotation by SO3. 2–: 1).

Formation of jarosite‐bearing deposits through aqueous oxidation of ...

deposits in a depression. Aqueous oxidation of these .... Solutions. [6] Interactions of pyrite with deep subsurface waters and surface solutions were modeled in closed and open systems, respectively. In the closed system, inefficient low- temperature ... reduced solutions with a uniform composition over a broad range of...

Pyrite Oxidation under initially neutral pH ... - Biogeosciences

Jan 16, 2012 ... accompanied by pH drop in the solution in contact with the pyrite cubes. 1 Introduction ..... depressed due to oxidative damage or stress in the cells caused by the free radicals generated near the ... uble reduced-S species such as thiosulfate or sulfite, the presence of planktonic cells. 20 suggests that the...

Mechanism of Bacterial Pyrite Oxidation - American Society for ...

oxidation of untreated pyrite, whereas with HCl-pretreated pyrite both a decrease in .... solution. Oxygen-free N2 (obtained by passage over hot copper) was bubbled in series through distilled water humidifiers, the pyrite mixtures, and 5% cadmium acetate solutions(H2S ... acid-soluble iron from pyrite depressed the rate.

Electrochemical Conditioning of a Mineral Particle Bed ... - CDC stacks

Spectra of EX solution at pH 9.2 in contact with a pyrite bed in the presence of chalcocite dissolution products ...................... '" . ... Decrease in EX concentration in contact with pyrite beds in the absence and presence of chalcocite dissolution products . ..... The apparent activation of pyrite and depression of chalcocite in a...

AMicro Ecros: Microscale and Electrometallurgically assisted ...

Apr 10, 2017 ... The main objective of the AMicro Ecros project is to solve the following challenges: ... in mineral ores: c.a. 70%;; Successful processing of complex sulphides is key to face the coming years of extractive technology;; Pyrite accompanies flotation reducing processing efficiency unless successfully depressed.

A demonstration of an affinity between pyrite and organic matter in a ...

Feb 7, 2011 ... Biogenic pyrite can form by sulphate-reducing bacteria producing H2S from sea-water sulphate, where the S2- may be incorporated into pyrite, or it could form from the reduction of sulphur released by ..... Revised equation and table for determining the freezing point depression of H2O-NaCl solutions.

US5171428A - Flotation separation of arsenopyrite from pyrite ...

Arsenopyrite is separated from a mixture with pyrite by contacting the mixture with a sulfitic agent providing HSO 3 - ions at elevated temperature and pH below about 8 for a period sufficient to impart a selective depression property to the arsenopyrite. On addition of a collector the pyrite is rendered floatable, enabling froth...

Implications of Sulfate-Reduction and Pyrite Formation Processes ...

metal sulfides removes iron from solution. Because such changes in water ... pyrite mines. Summer sulfate reduction rates in sediments near the AMD inflow are consistently at least a magnitude higher than control areas. Acid volatile sulfide .... the third cell, DO levels were depressed every- where. However, surface water in...

Role of pH and dissolved mineral species in Pittsburgh No.8 coal ...

The role of pH and of dissolved mineral species on the separation of pyrite and non- ... decrease in the selectivity for non-pyritic minerals separation. ... the selectivity, even though it depressed coal flotation considerably. This is attributed to the non-selective precipitation of Fe species between the surfaces of coal and pyrite.

1 - McGill University

reduction in the density of surface OH- sites necessary for electrostatic interaction with xanthate ion in the Hodgson/Agar model of pyrrhotite floatability. 1. Page 3. 1. 1. ~. II. RÉsUMÉ. La dépression ou l'activation des sulfures de fer (pyrite et pyrrhotine) par ..... iron hydroxide and S in alkaline solutions. CuFeS2 + 2H20...

Study on Selective Depression of Pyrite during Copper Bioleaching

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...

A Study of Pyrite/Solution Interface by Impedance ... - CiteSeerX

Several equivalent circuit models are considered for analysis of the ac impedance spectrum of pyrite/solution inter- face. These models take into .... An inclined, depressed, or rotated semi-circle in the Ny- quist plot (ZI vs. ZR) is observed in many ..... S-rich layer increases, C is expected to decrease. The iron- rich products of...

The depression of quartz in sulphide flotation - Scholars' Mine

flotation of quartz in a quartz-pyrite mixture •• 21 c. Tests to ... Calculation of available sodium ion in solutions of sodium ...... reduction valve. The reduction valve inlet gauge was calibrated in pounds per square inch and the outlet gauge in litres per minute. A constant flow of two litres per minute was maintained to the cell...

Pyrite-Gold Recovery in Copper Rougher Flotation Tailings

A decrease in grind size of the flotation feed from 70 µm to 38 µm and without pyrite flotation stage resulted in a ... as the mechanisms responsible for pyrite depression/rejection using EDTA extraction techniques. II. .... in solution by inductively coupled plasma mass spectroscopy. (ICP-MS). III. RESULTS AND DISCUSSION.

Investigation of Flotation Parameters for Copper Recovery from ...

Feb 22, 2012 ... selectively recovered within 5min at slurry pH of 4 and As content in the final tailings was reduced to 0.22mass%. In mix ore. (enargite + ..... 6 Shows dissolution of metals into solution during flotation at different pH conditions. .... depression could be due to the un-liberated enargite in pyrite responding to...

DRY SEPARATION OF PYRITE FROM COAL

resulted in definite decreases in the amounts of Fe(II1) reduced (Table 2). This phenomenon is believed to be associated with the depressed dissociation of Fe(OH), with increasing pH, together with the supposition that the dithionite reduction proceeds through a solution mechanism involving the ferric ion. (4) employed...

Explainer: The scheme that will fix pyrite victim's crumbling homes

Feb 26, 2014 ... Applications open today for the €10 million scheme that allows remedial work to be carried out on qualifying homes.

ome Chemical Relationships \mong Sulfur Species and dissolved ...

Solution and deposition of iron in aquifiers__________________ ______. 71 .... sulfide is 4X10~19; for pyrite, about 10~30; and for siderite, 2.11X. 10~n . The behavior of the sulfides is affected by pH and by oxidation and reduction. Both the cationic ..... relatively rapid within cones of depression around pumping wells and.

selective flotation of galena and sphalerite at rosh pinah mine

sphalerite and pyrite in the lead flotation circuit. As explained in Chapter 2, cyanide ... for the effective depression of sphalerite from Cu-Pb-Zn sulphide ore at alkaline pH values. Examples are presented in .... As seen in Figure 7.3 the concentration of free cyanide in solution will decrease with decreasing pH. Thus, it is also...

REDUCTION LEACHING OF CHALCOPYRITE ... - Open Collections

The sulphide minerals bornite (Cu^FeS/^) and pyrite (FeS2 ), comnonly found .... Solution 6 1. 86. 10. Schematic Representation of a Postulated. CuFeS2-Cu° Couple in Copper Sulphate. So 1 ut i on. 87. 11. Schematic Representation of a Cuprous-. Mediated .... shut down due to the depressed copper market at the time^.

Recycling Process Water in Complex Sulphide Ore ... - DiVA portal

XPS spectra of chalcopyrite treated in solution containing 5x10-5M of potassium amylxanthate ... pyrite in the presence of process water and water containing calcium ions all at flotation pH. 10.5. These surface species ... the first time in mineral processing application and its formation was reduced by diethylenetriamine...

Non-ferrous metallurgical processing | Lhoist - Minerals and lime ...

Pyrite depression during sulfide mineral flotation ... Without pyrite depression the FeS2 would contaminate and dilute the concentrate product. ... This acidic solution is neutralized in several steps using lime, precipitating the dissolved element impurities from solution and recovering valuable base metals (Ni, Co, Cu) as...

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