Midrex International B.v. Zurich Branch

Tabuchi Electric Co., Ltd.

Keisuke Honda

Isao Kobayashi

Shoichi Kikuchi

Koji Tokuda

Shuzo Ito

Osamu Tsuge

Yasuhiro Tanigaki

Hidekazu Okamoto

Disclosed herein is a spacer fixing structure including a core member constituting a core to be wound with a coil; and a plate spacer fixed to the core member. The spacer has a loop shape. A communication groove is formed in at least one surface of front and back surfaces of the spacer, and extends radially to communicate with inner and outer peripheries of the spacer. A region of the at least one surface of the spacer other than a grooved portion is left as a flat surface. At least the flat surface of the spacer is adhered to the core member via an adhesive layer made of an adhesive.

Spacer fixing structure

Metallic iron nuggets made by reducing-melt of a material containing a carbonaceous reductant and a metal-oxide-containing material, the metallic iron nuggets comprising at least 94% by mass, hereinafter denoted as '%', of Fe and 1.0 to 4.5% of C, and having a diameter of 1 to 30 mm are disclosed.

Metallic iron nuggets

The present invention is directed to a method of producing granular metallic iron, including: heating a formed raw material comprising a carbonaceous reductant and a substance containing iron oxide in a reduction melting furnace to subject the iron oxide contained in the formed raw material to solid-state reduction; and carburizing reduced iron resulting from the solid-state reduction with carbon contained in the carbonaceous in the formed raw material and causing resulting molten metallic iron to coalesce into the granular metallic iron, wherein an atmospheric gas present in proximity to the formed raw material in the carburizing and melting step has a reduction degree of not less than 0.5. The present invention is also directed to a method of producing metallic iron, including forming a deposit layer containing slag produced in the reduction melting process on hearth refractories, thereby protecting the hearth refractories while producing the metallic iron. The present invention is further directed to a device for supplying an auxiliary raw material to a hearth of a moving hearth type reduction melting furnace adapted to produce metallic iron, the device including a supply duct vertically connecting with a ceiling portion of the furnace.

Method of producing metallic iron

A method of manufacturing a molten metal iron by charging a starting material at least comprising a carbonaceous reducing material and an iron oxide-containing material into a rotary hearth furnace, reducing under heating the charged starting material into a solid reducing iron, carburizing the metal iron in the solid reduced iron with the carbon ingredient in the carbonaceous reducing material, thereby melting the metal iron, separating the slag ingredient contained in the starting material by the melting, and discharging the molten metal alloy in the molten state as it is to the outside of the rotary hearth furnace for recovery, wherein a downward inclined surface is disposed at an angle 3 to 30&deg; relative to the horizontal plane on the upper surface of a hearth of the rotary hearth furnace on which the starting material is placed, and the molten metal iron is discharged at the discharging position for the molten metal iron from the lowest portion of the inclined surface.

Growing community of inventors

Osaka, Japan

Keisuke Honda