TY - JOUR

T1 - Transformations of Pyrite and Pyrrhotite in Supercritical Water

AU - Fedyaeva, O. N.

AU - Vostrikov, A. A.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - The interaction of pyrite (FeS2) with water at the uniform heating (1.5 K/min) of the reaction mixture to 923 K and its subsequent cooling (about 3 K/min) to 423 K is studied. The reaction products are analyzed using the methods of mass-spectrometry, elemental and X-ray diffraction analyses, and scanning electron microscopy. It is established that H2S, SO2, and rhombic and hexagonal pyrrhotite (FeS) are formed while heating, and the subsequent cooling of the reaction system gives rise to the formation of H2S, H2, cubic pyrite, and monoclinic pyrrhotite exhibiting ferromagnetic properties. It is shown that the transformations FeS2 → FeS → FeSx (1 OpenSPiltSPi x ≤ 2) are accompanied by changes in the morphology and size of particles.

AB - The interaction of pyrite (FeS2) with water at the uniform heating (1.5 K/min) of the reaction mixture to 923 K and its subsequent cooling (about 3 K/min) to 423 K is studied. The reaction products are analyzed using the methods of mass-spectrometry, elemental and X-ray diffraction analyses, and scanning electron microscopy. It is established that H2S, SO2, and rhombic and hexagonal pyrrhotite (FeS) are formed while heating, and the subsequent cooling of the reaction system gives rise to the formation of H2S, H2, cubic pyrite, and monoclinic pyrrhotite exhibiting ferromagnetic properties. It is shown that the transformations FeS2 → FeS → FeSx (1 OpenSPiltSPi x ≤ 2) are accompanied by changes in the morphology and size of particles.

KW - hydrogen sulfide

KW - pyrite

KW - pyrrhotite

KW - sulfur

KW - supercritical water

KW - NANOPARTICLES

KW - CONVERSION

KW - COAL

KW - PYROLYSIS

UR - http://www.scopus.com/inward/record.url?scp=85043290181&partnerID=8YFLogxK

U2 - 10.1134/S1990793117070077

DO - 10.1134/S1990793117070077

M3 - Article

AN - SCOPUS:85043290181

VL - 11

SP - 1070

EP - 1077

JO - Russian Journal of Physical Chemistry B

JF - Russian Journal of Physical Chemistry B

SN - 1990-7931

IS - 7

ER -