公开(公告)号：US3929457A

公开(公告)日：1975-12-30

申请号：US41640073

申请日：1973-11-16

Applicant: ASEA AB

Inventor： STENKVIST SVEN EINAR

IPC: H05B7/18 ,  C22B4/00 ,  F27B3/08 ,  F27D3/18 ,  F27D11/08

CPC classification number: F27D11/08 ,  C22B4/00 ,  F27D3/18 ,  Y02P10/214

Abstract: For direct current electric arc furnace melting of metal scrap a furnace includes a vessel having a bottom wall shaped so that a portion of the melt is collected in the latter after initial melting or introducing of molten metal to start the operation. This vessel has means for feeding scrap in pieces to the peripheral portion of the bottom wall to form at that location an annular pile, or one or more separate piles, of unmelted scrap contacting and electrically connecting with the melt but extending upwardly to a level above the melts level. An electrode is positioned vertically with an arcing and maintained above the level of the melt to form an arc therebetween, this electrode being spaced from the pile or piles of scrap when the operation has started. The melt is made an anode by maintaining a positive electrical connection from a DC power source with the pile or piles of scrap at a position above the level of the melt so that the current passes through the unmelted scrap, with consequent heating of the scrap while magnetically tending to keep it piled, and through the melt and via an arc to the arcing electrode, the latter being negatively connected with the power source. The arcing electrode is made of carbon and in the described way enjoys the advantages of operating as a cathode without requiring an arcing anode electrode or an electrically conductive vessel bottom. More than one negatively connected arcing electrode may be used.

Abstract translation: 对于金属废料的直流电弧炉熔化，炉子包括具有底壁形状的容器，使得在初始熔化或引入熔融金属以开始操作之后，将熔体的一部分收集在容器中。 该容器具有用于将碎片送入底壁的周边部分的装置，以在该位置处形成环形桩或一个或多个分开的未熔化废料桩，与未熔化的废料接触并与熔体电连接但向上延伸至上方 融化水平。 电极垂直放置并且保持在熔融物的高度以上，以在其间形成弧形，当操作开始时，该电极与桩或桩的碎片间隔开。 将熔体制成阳极，通过保持与直流电源的正电连接，其中桩或堆桩在高于熔体水平的位置处，使得电流通过未熔化的废料，从而导致废料的加热，同时 磁力倾向于保持其堆积，并且通过熔体和通过电弧到电弧电极，后者与电源负相关。 电弧电极由碳制成，并且以所述方式具有作为阴极操作的优点，而不需要电弧阳极电极或导电容器底部。 可以使用多于一个负连接的电弧电极。