| 摘要 |
PCT No. PCT/GB91/00911 Sec. 371 Date Jan. 4, 1993 Sec. 102(e) Date Jan. 4, 1993 PCT Filed Jun. 7, 1991 PCT Pub. No. WO92/01074 PCT Pub. Date Jan. 23, 1992A process for recovering metal from scrap using a furnace having a bath chamber, a dry hearth chamber, an exhaust duct, and an incinerator for burning fumes from the dry hearth chamber is presented. The process includes conveying oxygen or oxygen enriched air to the incinerator in order to produce a desired oxygen concentration within the incinerator; introducing at least a major portion of the gases leaving the incinerator into the bath chamber; venting a minor portion of the gases from the bath chamber through the exhaust duct; and passing at least a major portion of the balance of the gases through the dry hearth chamber and recycling the balance of the gases to the incinerator, and wherein the concentration of oxygen present in one of the furnace and a duct which conveys hot combustion gases from the incinerator to the furnace is determined, and the volume of oxygen admitted to the incinerator is controlled in order to maintain the desired oxygen concentration within the incinerator.
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