Systems and processes for pyrolyzing contaminants on foundry san

Furnaces – Refuse incinerator – Means for cleaning by combustion

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110246, 110346, 164 5, 241DIG10, B09B 300, F23G 500

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active

053637798

ABSTRACT:
The invention relates to combusting contaminants on foundry sand in a container (13) rotating about an axis (A) at a particular angle with a particularly placed oxygen-fuel burner (32). As the container (13) rotates about the axis (A), the oxygen-fuel burner (32) fires a flame and excess oxygen at a particular angle to enhance pyrolysis of the contaminants. The amount of excess oxygen is such that the resulting off gas contains at least 2% oxygen by volume, thus preventing or substantially minimizing products of incomplete combustion from leaving the container (13). After having pyrolyzed the contaminants, the firing of a flame and excess oxygen from the oxygen-fuel burner (32) may be replaced with oxidant dispersion an the bottom of the foundry sand. The resulting off gas from the container (13) may be treated in a post combustion furnace (7), a flue gas cooling means (8), a filtering device (9) and/or a pollutant removing means (11).

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WO91/08068, "A Method For Recovering Spent Foundry Sand By Roasting", Pio Fumagalli, Jun. 1991.
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