Cement manufacturing processes with a view to reducing NOx emissions in particular
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United States of America Patent
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Issued Date -
Feb 12, 2004
app pub date -
Oct 7, 2002
filing date -
Aug 8, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a process for the manufacture of cement, whereby a metal oxide known for its catalytic action in the reduction of nitrogen oxides NOx, selected from the group consisting of CuO, Co.sub.3O.sub.4, Mn.sub.3O.sub.4, Fe.sub.2O.sub.3, SnO.sub.2, NiO, ZnO, V.sub.2O.sub.5 and TiO.sub.2 is injected into the cement plant kiln flame and/or the precalcination zone flame if there is one. The preferred metal oxide is iron oxide which, depending on the quantity injected, makes it possible to reduce the rate of NOx in the gases rejected by the cement plant kiln and modulate the concentration of iron oxide in the final clinker. The invention also relates to a process for reducing NOx content in the gases emitted by the cement plant kiln.
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