Abstract: A dryer for particulate materials comprising an elongated, peripherally enclosed combustion tunnel having a combustion chamber and an exhaust outlet, a liner spaced from and around the combustion tunnel, having an exterior radiant heat reflective shield, a peaked upper roof portion defining a pair of diagonal, flow dividing, slide surfaces, the upper roof portion being of a metal alloy having a low coefficient of friction and high thermal conductivity, a jacket surrounding and generally spaced from the liner, cooperative with the liner to form a material drying chamber between the liner and jacket, the jacket having a configuration similar to that of the liner and an interior heat reflective shield, an elongated, particulate material inlet conveyor in the housing above the upper roof portion of the liner for dispensing particulate material over the length of the roof portion to evaporate volatilizable substances therefrom, an elongated, particulate material discharge conveyor in the jacket, beneath the liner,