Nippon Sanso Corporation

Nkk Corporation

Nobuaki Kobayashi

Toshio Suwa

Yoshiteru Kikuchi

Atsushi Inoue

Hideyuki Honda

Yasuyuki Yamamoto

Hiroshi Igarashi

Kimio Iino

Naoji Konno

An apparatus for melting a metal provided with a metal melting furnace ( ) for melting a metallic raw material with a flame of an oxygen fuel burner ( ) to which oxygen is supplied as a combustion assisting gas; and an oxygen supply source for supplying oxygen as a combustion assisting gas to the oxygen fuel burner ( ). The metal melting furnace ( ) has a preheating section ( ) for preheating the metallic raw material above a melting section ( ) to which the oxygen fuel burner ( ) is attached and a reduced section ( ) located between the melting section ( ) and the preheating section ( ), the reduced section having an inside diameter smaller than those of the melting section and preheating section. The oxygen supply source is a pressure swing adsorption separator ( ) employing an adsorbent which adsorbs preferentially atmospheric nitrogen and supplying a low-purity oxygen having an oxygen content of 65 to 94% to the oxygen fuel burner ( ).

Method for melting metals

Melting furnace of metals and melting method thereof

Disclosed is a method of melting a metal. In a melting furnace, a metallic material is melted by heating it directly with the flame from a fuel burner using an oxygen gas having a purity of 60 to 100% as a combustion assisting gas. Meanwhile, the combustion assisting gas is heated before it is fed to the burner.

Method of melting metals

Disclosed is a method of melting a metal, which can demonstrate improved heat efficiency, increased yield and minimized pollutive gas generation. In this method, a metallic material stacked in a melting furnace is melted by heating it directly with the flame from a fuel burner using an oxygen gas having a purity of 60 to 100% as a combustion assisting gas. The oxygen gas is burned at an oxygen-to-fuel ratio of 0.55 to 0.99, while the unburned portion of the combustion gas is allowed to burn by O.sub.2 supplied separately through oxygen lances. Meanwhile, the metallic material is preheated by burning the unburned portion of the combustion gas, whereas the combustion assisting gas is heated before it is fed to the burner.

Growing community of inventors

Yamanashi, Japan

Nobuaki Kobayashi