Method of pyroprocessing mineral ore material for reducing combustion NOx
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United States of America Patent
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Apr 24, 2001
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N/A
app pub date -
Nov 10, 1999
filing date -
Nov 10, 1999
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Abstract
A method of pyroprocessing mineral ores, such as iron ore. The method includes receiving a preheated product stream of iron-containing pellets at an infeed end of a rotary kiln and introducing an oxidizing gas into the tumbling bed toward the infeed end of the rotary kiln. Additionally, a combustible fuel is introduced through ports above the tumbling bed such that combustion of the introduced fuel increases the temperature of the product stream toward the infeed end. The increase in the temperature of the product stream allows the intensity of the flame from the centerline burner to be decreased, resulting in a reduction in the production of NO.sub.x. The apparatus for introducing both the oxidizing gas and fuel into the rotary kiln are common with each other.
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