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Wednesday, August 5, 2020 | History

2 edition of Inhibition of pyrrhotite oxidation with passivating agents found in the catalog.

Inhibition of pyrrhotite oxidation with passivating agents

Jason D. A. Hall

Inhibition of pyrrhotite oxidation with passivating agents

by Jason D. A. Hall

  • 304 Want to read
  • 36 Currently reading

Published by Laurentian University in Sudbury, Ont .
Written in English


Edition Notes

Statementby Jason D.A. Hall.
The Physical Object
Paginationiv, 49 l. :
Number of Pages49
ID Numbers
Open LibraryOL22162286M

The effect of a diacetylene-containing phospholipid on the oxidation of pyrite, FeS 2, was r work reported by our research group showed that the adsorption of l,2-bis(10,tricosadiynoyl)-sn-glycerophosphocholine on pyrite suppressed the extent of its oxidation by about 75% over a specific time s presented here show that the pre-exposure to UV radiation of.   The adsorption and the corrosion inhibiting effect of benzotriazole (BTAH) on Cu() electrodes in M HCl were investigated using in situ STM, in situ FTIR spectroscopy, and electrochemical measurements. In the double-layer range up to potentials of − V vs SCE a Cu surface morphology with extended, atomically flat terraces, separated by almost randomly oriented steps, and .

The inhibition of the bacteria was related to the shaking of the culture flasks and to the type, amount and particle size of the various materials studied. In the present work, high-grade pyrite was investigated in more detail with a view to determining its inhibitory nature for the iron-oxidizing thiobacilli. To participate in the Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Pyrometallurgy and Electrometallurgy. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to.

  Inhibition of sulfide mineral oxidation by surface coating agents: batch and field studies. Ji MK(1), Gee ED, Yun HS, Lee WR, Park YT, Khan MA, Jeon BH, Choi J. Author information: (1)Korea Institute of Science and Technology, Gangneung Institute, Saimdang-ro, . @article{osti_, title = {Pyrrhotite reaction kinetics: Reaction rates for oxidation by oxygen, ferric iron, and for nonoxidative dissolution}, author = {Janzen, M P and Nicholson, R V and Scharer, J M}, abstractNote = {The oxidation kinetics of 12 well-characterized pyrrhotite samples by oxygen and ferric iron and the nonoxidative dissolution in acidic solution were evaluated.


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Inhibition of pyrrhotite oxidation with passivating agents by Jason D. A. Hall Download PDF EPUB FB2

The potential of triethylenetetramine (TETA) to inhibit the oxidation of three pyrrhotites, Garson, McCreedy and Po has been studied systematically and confirmed by comparing the release of Fe and SO 4 2 - from samples with and without coating by:   Pyrite samples were analyzed from two distinct locales with the intent of determining the extent of oxidative inhibition occurring in the presence of a passivating agent.

Each sample was exposed to air and 9% H 2 O 2 as oxidizing agents over specific time periods with and without the presence of an iron oxide layer Inhibition of pyrrhotite oxidation with passivating agents book the pyritic by: Encapsulation is based on the inhibition of O 2 diffusion by a surface coating agent and is expected to control the oxidation of pyrite, pyrrhotite, and chalcopyrite for a substantial period of.

Similarly, although some passivating agents such as acetyl acetone, humic acids, ammonium lignosulfonates, oxalic acid, and sodium silicate also have the capability to inhibit pyrite from oxidation, these treatments also need peroxidation, and the coating with oxalic acid requires a temperature control at 65° by: 8.

Oxidation rate of pyrrhotite is faster than that of pyrite due to the vacancy of iron atoms in the pyrrhotite crystal structure (Belzile et al., ).

Thus DO shortage was much more in the Pyrr. Encapsulation is based on the inhibition of O 2 diffusion by a surface coating agent and is expected to control the oxidation of pyrite, pyrrhotite, and chalcopyrite for a. Synthetic pyrrhotite (% purity), in powdered form, was supplied by Aldrich Chemicals.

Pyrrhotite is a nonstoichiometric compound, of general formula Fe 1-x S, based on Fe(II) and S 2−. ions. Values for x vary within the range 0 Pyrrhotite with the upper limit of iron deficiency has the lowest (monoclinic) symmetry.

The protection of pyrrhotite surface from oxidant attack by TETA barrier and the alkaline property of this coating agent can be used to interpret the inhibition of oxidation.

View Show abstract. Experimental results indicate that TETA is an efficient coating agent in preventing the oxidation of pyrite and that the inhibition efficiency is more pronounced with the increase of TETA.

The electrochemical oxidation of pyrrhotite at pHand produces mainly sulphur and significant quantities of sulphate in the alkaline solutions and the oxidation of pyrrhotite is strongly inhibited under alkaline conditions due to the passivation of the surface by ferric oxides (Hamilton and Woods, ).

The aim of this study was to test the performance of a novel method for acid rock drainage (ARD) control through the formation of Al (OH) 3 -doped passivating surface layers on pyrite. At pH andthere was no obvious inhibition of the pyrite oxidation rate on addition of 20 mg L –1 Al 3+ (added as AlCl 3 6H 2 O).

Pyrite samples were analyzed from two distinct locales with the intent of determining the extent of oxidative inhibition occurring in the presence of a passivating agent. (oxidizing agent) may affect the oxidation process.

Therefore, the characterization of this reaction in the host rock is a fundamental step towards under-standing, modeling and properly treating the degra-dation observed in the concrete.

The objective of this paper is to analyze three. aspects that may affect the oxidation process of pyr. 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. Passivation, in physical chemistry and engineering, refers to a material becoming "passive," that is, less affected or corroded by the environment of future use.

Passivation involves creation of an outer layer of shield material that is applied as a microcoating, created by chemical reaction with the base material, or allowed to build from spontaneous oxidation in the air. The aim of this study was to test the performance of a novel method for acid rock drainage (ARD) control through the formation of Al(OH)3-doped passivating surface layers on pyrite.

At pH andthere was no obvious inhibition of the pyrite oxidation rate on addition of 20 mg L–1 Al3+ (added as AlCl36H2O). In comparison, the pyrite oxidation rate at circumneutral pH ( ± Factors such as the pyrrhotite concentration in the host rock and the oxygen access (oxidizing agent) may affect the oxidation process.

Therefore, the characterization of this reaction in the host rock is a fundamental step towards understanding, modeling and properly treating the degradation observed in. catalysis on oxidation reaction rates; 3) assess the dynamics and effects on water quality of pyrrhotite oxidation in tailings column studies; and 4) develop a modelling approach consistent with the mechanisms and controls on pyrrhotite oxidation reactions.

This study was conducted in three distinct phases. The first phase involved twelve distinct. Abstract. The biological leaching of pyrrhotite (Fe 1-x S) by Thiobacillus ferrooxidans was studied to characterize the oxidation process and to identify the mineral weathering products.

The process was biphasic in that an initial phase of acid consumption and decrease in redox potential was followed by an acid-producing phase and an increase in redox potential. The oxidation of tailings in ponds may result in acid rock drainage (ARD) which is believe to be able to contaminate the.

oxidation of pyrite, pyrrhotite and chalcopyrite at 52°C and 68% relative humidity (RH). Previous studies on weathered pyrite by Saksela (), Frenzel () and Nambu () or on the low-temperature oxidation of pyrite by jee (), Sinha and Walker () and Frost et al.

() do not show a.Anodic inhibitors, also known as passivation inhibitors, act as oxidizing agents, gaining electrons. Such inhibitors act by promoting the oxidation of the ferrous ions on ferritic ions, which precipitate, forming a passive dense film on the steel surface and ceasing the corrosion process anodic reaction [13, 36].

For the monitored time period ( days), field study results showed that the application of Na 2 SiO 3 effectively inhibited the pyrite oxidation as compared to KH 2 PO 4. Na 2 SiO 3 as a surface coating agent maintained pH 5–6 and reduced oxidation of pyrite surface up to and % indicated by Fe 2+ and SO 4 2− release, respectively.