skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Sulfur species leached from pyrite during oxidative desulfurization of coal in alkaline solutions

Abstract

The results indicate that thiosulfate, sulfite, and sulfate are the principal soluble sulfur species produced when coal-derived pyrite leached with a hot alkaline solution containing dissolved oxygen. The distribution of soluble sulfur species in the leachate was found to depend on leaching temperature, oxygen partial pressure, leachant composition, and time of contact. At lower temperatures and oxygen partial pressures and with a short time of contact between the leaching solution and pyrite, the leachate sulfur species were dominated by thiosulfate. However, the leachate also contained significant amounts of sulfite and sulfate. When the temperature, oxygen partial pressure, or time of contact were increased, the proportions of thiosulfate and sulfite decreased and the proportion of sulfate increased. It was observed also that reacted pyrite particles catalyzed the oxidation of thiosulfate to sulfite and sulfate. Consequently when pyrite was oxidized in a stirred reactor for 1 h at elevated temperature and oxygen partial pressure, most of the dissolved sulfur appeared as sulfate and very little as thiosulfate or sulfite. 10 references, 4 figures, 1 table.

Authors:
; ;
Publication Date:
Research Org.:
Iowa State Univ. of Science and Technology, Ames (USA)
OSTI Identifier:
6777790
Report Number(s):
IS-M-462; CONF-830807-15
ON: DE84012135
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Conference
Resource Relation:
Conference: International conference on coal science, Pittsburgh, PA, USA, 15 Aug 1983; Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL PREPARATION; DESULFURIZATION; PYRITE; OXIDATION; CHEMICAL COMPOSITION; LEACHATES; PH VALUE; SULFATES; SULFITES; THIOSULFATES; CHALCOGENIDES; CHEMICAL REACTIONS; DISPERSIONS; IRON COMPOUNDS; IRON SULFIDES; MINERALS; MIXTURES; OXYGEN COMPOUNDS; SOLUTIONS; SULFIDE MINERALS; SULFIDES; SULFUR COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 013000* - Coal, Lignite, & Peat- Transport, Handling, & Storage

Citation Formats

Stephenson, M D, Wheelock, T D, and Markuszewski, R. Sulfur species leached from pyrite during oxidative desulfurization of coal in alkaline solutions. United States: N. p., 1983. Web.
Stephenson, M D, Wheelock, T D, & Markuszewski, R. Sulfur species leached from pyrite during oxidative desulfurization of coal in alkaline solutions. United States.
Stephenson, M D, Wheelock, T D, and Markuszewski, R. 1983. "Sulfur species leached from pyrite during oxidative desulfurization of coal in alkaline solutions". United States.
@article{osti_6777790,
title = {Sulfur species leached from pyrite during oxidative desulfurization of coal in alkaline solutions},
author = {Stephenson, M D and Wheelock, T D and Markuszewski, R},
abstractNote = {The results indicate that thiosulfate, sulfite, and sulfate are the principal soluble sulfur species produced when coal-derived pyrite leached with a hot alkaline solution containing dissolved oxygen. The distribution of soluble sulfur species in the leachate was found to depend on leaching temperature, oxygen partial pressure, leachant composition, and time of contact. At lower temperatures and oxygen partial pressures and with a short time of contact between the leaching solution and pyrite, the leachate sulfur species were dominated by thiosulfate. However, the leachate also contained significant amounts of sulfite and sulfate. When the temperature, oxygen partial pressure, or time of contact were increased, the proportions of thiosulfate and sulfite decreased and the proportion of sulfate increased. It was observed also that reacted pyrite particles catalyzed the oxidation of thiosulfate to sulfite and sulfate. Consequently when pyrite was oxidized in a stirred reactor for 1 h at elevated temperature and oxygen partial pressure, most of the dissolved sulfur appeared as sulfate and very little as thiosulfate or sulfite. 10 references, 4 figures, 1 table.},
doi = {},
url = {https://www.osti.gov/biblio/6777790}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: