Effect of some metal chlorides on the transformation of pyrite to pyrrhotite

Technical Report · Sun Aug 01 04:00:00 EDT 1982

OSTI ID:6877526

Shiley, R H; Konopka, K L; Hinckley, C C; Smith, G V; Twardowska, H

Samples of the iron-sulfide mineral pyrrhotite were prepared using a procedure designed to closely model the pyrite-to-pyrrhotite conversion that occurs during coal-conversion processing. Pyrite mixed with graphite converts to mixtures of monoclinic and hexagonal pyrrhotite when heated at 500C for 4.5 hours, and an iron-rich pyrrhotite (Fe10S11) forms at 600 to 700C. In addition to temperature effects, the pyrrhotites formed from pyrite in graphite are also dependent on additives or impurities in the form of metal salts. The pyrrhotites used in this study were prepared in the presence of selected transition metal chlorides: PdCl2, NiCl2, CoCl2, ZnCl2, MoCl5, and ZrCl4. When these metal salts were used, pyrrhotites with an increased number of iron vacancies were produced. For example, in the presence of ZrCl4 at temperatures as high as 700C, a pyrrhotite was produced that exhibited Moessbauer magnetic-splitting values characteristic of pyrrhotite with a high number of iron vacancies (iron-poor). These pyrrhotites were then converted to troilite at 400C in the presence of CO and H2; and this troilite is an active catalyst for the Fischer-Tropsch synthesis, alkene hydrogenation, the Boudouard reaction, the water-gas shift reaction, and the hydrodesulfurization of organic sulfur compounds.

• Research Organization: Illinois Inst. of Natural Resources, Champaign (USA). State Geological Survey Div.
• OSTI ID: 6877526
• Report Number(s): PB-82-255506
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COAL GASIFICATION
COBALT
ELEMENTAL MINERALS
ELEMENTS
GASIFICATION
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
IRON COMPOUNDS
IRON SULFIDES
METALS
MINERALS
MOLYBDENUM
NICKEL
NONMETALS
PALLADIUM
PLATINUM METALS
PYRITE
PYRRHOTITE
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC
ZIRCONIUM