Improved methods for determination of ferrous sulfides in coal chars

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6818456

Chao, S S; Mason, D M; Attari, A

A fundamental research investigation of the behavior of mineral matter in fluidized bed gasification of coal is in progress at IGT under a program largely supported by the US Department of Energy. Special attention has been focused on the gasification of high sulfur and high iron containing coals, and the mechanism of ash agglomeration which facilitates the selective removal of ash from a reactor bed without loss of unacceptable amounts of char carbon. It has been noted that ferrous sulfides, especially, pyrrhotite, play a variety of important roles in coal conversion processes. Their possible catalytical activity in coal liquefaction (5) and coal gasification (6,7) was reported recently. In our pilot plant studies we have occasionally found that ferrous sulfide may play an independent role in agglomeration, acting as a binding medium between shale particles in the bed when run-of-mine coal is fed (Fig.1) (4). Under some circumstances, ferrous sulfide has formed deposits in the hot cyclone, which returns entrained char particles to the bed. In order to better understand their functions in coal conversion, an accurate quantitative method for ferrous sulfides determination is needed. In the search of a more accurate method, we have re-evaluated a number of potential existing methods and developed a few new methods for ferrous sulfides analysis. The most successful method uses a reducing agent to enhance the recovery of ferrous sulfide as hydrogen sulfide in a hydrochloric acid evolution procedure. Results from the analyses of six 1400/degree/F coal chars using different methods are presented and discussed. 11 refs., 2 figs., 3 tabs.

• Research Organization: Institute of Gas Technology, Chicago, IL (USA)
• DOE Contract Number: AC21-84MC21313
• OSTI ID: 6818456
• Report Number(s): CONF-8708275-2; ON: DE88017152
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
010600 -- Coal
Lignite
& Peat-- Properties & Composition
AGGLOMERATION
ASHES
CHALCOGENIDES
CHARS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL GASIFICATION
COMBUSTION
ELEMENTS
FLUIDIZED-BED COMBUSTION
GAMMA SPECTROMETERS
GASIFICATION
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON COMPOUNDS
IRON SULFIDES
MEASURING INSTRUMENTS
MOESSBAUER SPECTROMETERS
NONMETALS
OXIDATION
PYROLYSIS PRODUCTS
REDUCING AGENTS
RESIDUES
SPECTROMETERS
SPECTROSCOPY
SULFIDES
SULFUR
SULFUR COMPOUNDS
SULFUR CONTENT
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY