The mechanisms of pyrite oxidation and leaching: A fundamental ...
Sep 1, 2010 · Pyrite oxidation is economically important in mineral flotation and leaching, two industrial methodologies used to separate pyrite from other minerals of value. Oxidation can impart hydrophobicity or hydrophilicity to pyrite surfaces and hence influences interactions with collectors during flotation [5] .
High redox potential promotes oxidation of pyrite under neutral ...
Aug 15, 2021 · Electrochemical analysis showed that the threshold for pyrite oxidation under neutral conditions was a redox potential greater than 200 mV (vs SHE), which was consistent with the results from pyrite desulfurization studies (Mu et al., 2020).
Pyrite formation from FeS and H2S is mediated through microbial redox …
Feb 28, 2019 · Our results show that pyrite formation can be mediated at ambient temperature through a microbially catalyzed redox process, which may serve as a model for a postulated primordial iron−sulfur world.
Pyrite mega-analysis reveals modes of anoxia through geological …
Mar 16, 2022 · Unique combinations of pyrite framboid– and nodule-bearing rocks, pyrite compositions, and bulk redox proxies offer new perspectives on the modes of anoxia through Earth’s history.
Study of the kinetics of pyrite oxidation under controlled redox ...
May 1, 2015 · An experimental study of the ferric oxidation kinetics of pyrite was conducted under controlled redox potentials of 700, 800 and 900 mV (vs. SHE). The rate of pyrite oxidation strongly depends on redox potential, increasing fivefold when redox potential is increased by 100 mV.
Pyrite oxidation in column at controlled redox potential of 900 …
Feb 8, 2017 · The effects of temperature and controlled redox potential on kinetics of pyrite dissolution are widely investigated in stirred tank reactors, but few are investigated in columns, in which pyrite leaching is more similar to the heap leaching.
Reductive dissolution of pyrite by methanogenic archaea
Jun 10, 2021 · Here, we show that methanogens can catalyze the reductive dissolution of FeS 2 at low temperature (≤38 °C) and utilize dissolution products to meet cellular iron and sulfur demands associated ...
High redox potential promotes oxidation of pyrite under neutral ...
Aug 15, 2021 · Pyrite autotrophic denitrification (PAD) represents an important natural attenuation process of nitrate pollution and plays a pivotal role in linking nitrogen, sulfur, and iron cycles in a variety of anoxic environments.
Quantifying Fenton reaction pathways driven by self-generated H
Mar 6, 2017 · Oxidation of pyrite (FeS 2) plays a significant role in the redox cycling of iron and sulfur on Earth and is the primary cause of acid mine drainage (AMD).
Pyrite Oxidation Mechanism by Oxygen in Aqueous Medium
Jan 11, 2016 · In this work, a redox process was proposed involving the electron transference between iron and adsorbed species on the pyrite surface. The key point to understand the pyrite oxidation mechanism is how the oxygen can act over the surface oxidizing the iron centers.