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Coal contaminants must be removed by washing or flue-gas scrubbing or they will be released during burning to form sulfur dioxide (SO2), sulfate (SO4), CO2, NOx, and

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Coal contaminants must be removed by washing or flue-gas scrubbing or they will be released during burning to form sulfur dioxide (SO2), sulfate (SO4), CO2, NOx, and






 
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