上海铁合金厂303号炉为20000KVA 三相矿热电炉,主要生产75%硅铁。长期以来硅回收率仅85%左右,电耗高达8864度/吨,每昼夜耗电40万度,是全市有名的“电老虎“。QC 小组成立以后,针对电耗问题,进行因果分析,找出电耗高的大小原因54个。经归类排列和相关分析,发现电耗随着硅回收率的提高而降低。而硅回收率又受批料中纯碳加入量的影响。通过物料平衡计算,得出当满足还原反应所需纯碳用量为121公斤时,硅回收率可达 Shanghai Ferroalloy Plant No. 303 furnace 20000KVA three-phase ore furnace, the main production of 75% ferrosilicon. Long-term silicon recovery rate of only about 85%, power consumption up to 8864 degrees / ton, 400,000 degrees per day power consumption, is the city’s famous ”electric tiger." QC group was established, for the power problem, a causal analysis to find out the reasons for the high power consumption of 54 reasons. According to the classification and correlation analysis, it is found that the power consumption decreases with the increase of silicon recovery rate. The silicon recovery rate by the amount of pure carbon in the batch. Through the material balance calculation, it is concluded that when the pure carbon required for the reduction reaction is 121 kg, the silicon recovery rate is up to