A vortex chamber includes an outer circumference wall, a container, an annular shoal portion provided between the container and the outer circumference wall so as to encircle the outer circumference of the container, and a dam portion protruding upward from the upper surface of the outer circumference of the container so as to partition the container from the shoal portion. An undried nonferrous metal block is fed into the shoal portion, the block having such a size that is not completely submerged into the molten metal in the shoal portion. The fed nonferrous metal block is gradually melted to have a reduced volume of small pieces and particles of nonferrous metal, which are re-circulated in the shoal portion, flown over the dam portion, and dropped into the container, thereby forming a vortex in the container in which remaining small pieces and particles submerged into the molten metal are melted.

A method for manufacturing reduced iron using the same, and more particularly, to a burning apparatus heating a coal briquette to manufacture reduced iron, which includes a first burning furnace heating the coal briquette while moving the truck accommodating the coal briquette along a linear movement path; a second burning furnace connected to the other side of the first burning furnace, and heating the coal briquette while moving the coal briquette discharged from the truck along an annular path; and a cooling device connected to the second burning furnace, and cooling the reduced iron while moving reduced iron reduced in the second burning furnace along an annular path. The burning apparatus circulates exhaust gases generated in the burning furnace and cooling device to control a temperature and an oxygen concentration and thus improves a metallization rate of the reduced iron.

The present invention in various embodiments provides an oven system, having movable heating panels adapted to a partitioning mechanism, to change the heating chamber into one or more compartments in the housing, as per user requirements. The partitioning mechanism with the movable heating panels may be adapted to the extendable member or walls of the oven chamber including base, side walls or top wall of the oven chamber. The rotational holders may be adapted in the extendable member or the base of the oven chamber for adapting the skewers or food holders. Thus, the present invention creates an oven system which allows the user to maximize and optimize the use of the oven system in a more effective way.

A vortex chamber includes an outer circumference wall, a container, an annular shoal portion provided between the container and the outer circumference wall so as to encircle the outer circumference of the container, and a dam portion protruding upward from the upper surface of the outer circumference of the container so as to partition the container from the shoal portion. An undried nonferrous metal block is fed into the shoal portion, the block having such a size that is not completely submerged into the molten metal in the shoal portion. The fed nonferrous metal block is gradually melted to have a reduced volume of small pieces and particles of nonferrous metal, which are re-circulated in the shoal portion, flown over the dam portion, and dropped into the container, thereby forming a vortex in the container in which remaining small pieces and particles submerged into the molten metal are melted.

The invention relates to a gate unit for gas-tight sealing of two adjacent high temperature zones within a high temperature oven, comprising a gate panel displaceable between an open position and a closed position within a guide structure. At least one sealing element is transported with the gate panel. Protecting means can be transported by the gate panel over at least one part of a transport path of the same, by which at least one segment of the sealing element can be protected over at least one part of the displacement path of the gate panel against influences harmful to the sealing element particularly against radiant heat. The invention further relates to a high temperature oven having an oven tunnel comprising a first high temperature zone and a second high temperature zone. The gate panel is disposed in a transition region between the first and the second high temperature zones.

The invention relates to a device for heating molten metal by the use of a heater that can be immersed into the molten metal. This immersion heater includes an outer cover formed of one or more materials resistant to the molten metal in which the immersion heater is to be used, and a heating element inside of the outer cover, where the heating element is protected from contacting the molten metal.

A heat treatment apparatus includes a heating unit, a chamber, an exhaust unit, a partition unit and a switching unit. The heating unit supports and heats a substrate on which a film of a processing liquid is formed. The chamber surrounds the substrate supported by the heating unit. The exhaust unit is configured to discharge a gas from an inner space of the chamber through a discharge opening located near the heating unit. The partition unit is configured to partition the inner space of the chamber into a first space where the substrate on the heating unit is exposed and a second space located above the first space. The switching unit is configured to switch between a first state where the gas is discharged by the exhaust unit through the first space and a second state where the gas is discharged by the exhaust unit through the second space.