| 摘要 |
<p>An apparatus (14) embodying heat exchange means for treating solid, granular and aggregate materials, and in particular for treating spent, i.e., used, chemically bonded foundry sand. The subject apparatus (14) includes a rotatable first chamber means (16) in which the used foundry sand is preheated while traveling in a first direction therethrough from one end thereof to the other end thereof. From the first chamber means (16) the preheated used foundry sand is suitably conveyed to a thermal reclaimer means (12) for purposes of thermally removing organic matter therefrom. Thereafter, the used foundry sand is conveyed to a second chamber means (44) wherein the used foundry sand undergoes post reclamation whereby any organic matter that may yet remain in the foundry sand is thermally removed therefrom. From the second chamber means (44) the used foundry is made to pass into a third chamber means (52) which is located in surrounding heat exchange relation to the first chamber means (16). As the used foundry sand flows through the third chamber means (52) in a second direction heat is exchanged between the foundry sand traveling through the third chamber means (52) and the foundry sand traveling through the first chamber means (16) such that the former loses heat, i.e., is being cooled and the latter absorbs heat, i.e., is being preheated.</p> |
