民主德国1986年公布的第231579号专利提出了从炉瘤中回收金属的方法。当熔化再生铜原料的竖炉炉役结束时,从炉缸内可取出直径1～1.5米、高500～800毫米、重达10吨的块状炉瘤。炉瘤的组织不均匀。其组成部分是(%):含有铁杂质的塑性铜10～20;铜铁焦炭混合体30～40;被金属浸透了的耐火材料40～60。炉瘤中所含金属部分是(%):铜32～45;铅 German Patent No. 231579, published in 1986, proposes a method of recovering metal from a hearth. When the shaft furnace of molten recycled copper raw material is finished, the furnace with the diameter of 1 to 1.5 meters, the height of 500 to 800 mm and the weight of 10 tons can be removed from the hearth. Knot tumor tissue is not uniform. Its components are (%): 10 to 20 percent of plasticized copper containing iron impurities; 30 to 40 percent of copper-iron coke mixture; and 40 to 60 of refractory material impregnated with metal. Metal parts contained in the furnace tumor is (%): Copper 32 ~ 45; lead