Title page for ETD etd-01242009-063125
|Type of Document
||Hill, David T.
||Removal of trace elements from coal using a multiple-property processing circuit
||Master of Science
|Novak, John T.
|Knocke, William R.
|Luttrell, Gerald H.
|Date of Defense
The U.S. Environmental Protection Agency is conducting a
three-year study of toxic air emissions specific to coal fired
utilities to assess the potential health risks of
trace elements released during coal combustion. Several
trace elements in coal associate with the mineral matter
while others associate with pyrite. Researchers at the
Virginia Center for Coal and Minerals Processing have
developed a multiple-property processing circuit capable of
providing high rejections of ash-forming mineral matter and
pyritic sulfur. Reductions were expected for trace elements
associated with the mineral matter and pyritic sulfur in
proportion to ash and pyrite reductions. Trace elements
associated with the organic fractions of coal that may be
more difficult to remove by physical cleaning are ideal
candidates for removal by chelating agents. The purpose of
this study was to determine whether trace elements can be
effectively separated from coal using the circuit followed
by chelating agents. Thirteen of the sixteen trace elements
examined in this study were reduced (27-93%) in
concentration by the circuit. EDTA further reduced (2-17%)
the concentrations of several trace elements in the circuit
product coals. EDTA was found to be effective at low
concentration and without pH adjustment I providing a
practical means for further reducing the concentrations of
several trace elements beyond circuit processing.
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