Process for treating exhaust gaseous mixtures from directly exposing asphalt-aggregate compositions to hot gases

摘要

The process of the invention comprises directly exposing asphalt- aggregate compositions to hot gases of combustion in which a resulting gaseous mixture comprises mineral particulate matter, nitrogen, carbon dioxide, water vapor, and volatile hydrocarbons resulting from exposure of the asphalt- aggregate composition to the hot gases of combustion, directing the resulting gaseous mixture to a treating chamber and injecting a flame into it. The apparatus according to the invention includes an elongated drum in which asphalt-aggregate composition is exposed directly to flame and/or hot gases of combustion therefrom, and means for exhausting the resulting gaseous mixture to a separate treating chamber.