The present invention to prevent the corrosion of the drum body with can respond to the long-term use, to provide an outside thermal drying equipment and the drying method of the object to be treated that the thermal conductivity of the case can be ensured to be indirectly heated from the outsideIn forming the A outer thermal drying apparatus, the inner wall member is constituted by a metal material having high corrosion resistance in comparison with the outer wall member, the outer wall member is formed of a metal material having high heat transmission resistance than the inner wall member, It comprises a drum body 4 object to be processed is introduced, the stirring and mixing apparatus 5 disposed in the drum body 4, and a burner 6 for heating the drum body 4 from the outsideFIELD 3【課題】ドラム本体の腐食を防止して長期の使用に対応できるとともに、外部から間接的に加熱する場合の熱伝導性を確保できる被処理物の外熱式乾燥装置及びその乾燥方法を提供する。【解決手段】外熱式乾燥装置を構成するにあたって、内壁部材が外壁部材に比べて耐食性の高い金属材料により構成され、外壁部材が内壁部材に比べて熱伝動性の高い金属材料により構成され、被処理物が投入されるドラム本体4と、該ドラム本体4内に配置された攪拌混合機5と、前記ドラム本体4を外部から加熱するバーナ6とを備える。【選択図】図3
