Development of enhanced sulfur rejection processes
Research at Virginia Tech led to two complementary concepts for improving the removal of inorganic sulfur from much of the Eastern US coals. One controls the surface properties of coal pyrite (FeS[sub 2]) by electrochemical-.potential control, referred to as the Electrochemically Enhanced Sulfur Rejection (EESR) Process: The second controls the flotation of middlings, i.e., particles composed of pyrite with coal inclusions by using polymeric reagents to react with pyrite and convert the middlings to hydrophilic particles, and is termed the Polymer Enhanced Sulfur Rejection (PESR) Process. These new concepts are based on recent research establishing the two main reasons why flotation fails to remove more than about 50% of the pyritic sulfur from coal: superficial oxidization of liberated pyrite to form polysulfide oxidation products so that a part of the liberated pyrite floats with the coal; and hydrophobic coal inclusions in the middlings dominating their flotation so that the middlings also float with the coal. These new pyritic-sulfur rejection processes do not require significant modifications of existing coal preparation facilities, enhancing their adoptability by the coal industry. It is believed that they can be used simultaneously to achieve both free pyrite and locked pyrite rejection.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
- DOE Contract Number:
- Resource Type:
- Technical Report
- Research Org:
- Virginia Center for Coal and Minerals Processing, Blacksburg, VA (United States)
- Sponsoring Org:
- DOE; USDOE, Washington, DC (United States)
- Country of Publication:
- United States
- 01 COAL, LIGNITE, AND PEAT; COAL PREPARATION; DESULFURIZATION; PYRITE; REMOVAL; FLOTATION; PLANNING; PROGRESS REPORT; CHEMICAL REACTIONS; DOCUMENT TYPES; MINERALS; SEPARATION PROCESSES; SULFIDE MINERALS 010300* -- Coal, Lignite, & Peat-- Preparation-- (1987-)
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