一、原料及生产工艺过程：
冶炼三分厂主要生产微碳铬铁、中低碳铬铁。所用原料有铬矿、硅铬合金、石灰。有原料库皮带机输送上料，采用硅铬堆底法新工艺的上料程序注入3000kva电炉冶炼。按所投原料含碳量的高低炼出不同规格的铬铁，然后将铁水经过真空处理，浇注成铁板，冷却后精整至小于13公斤重的铁块，再经压缩空气吹扫、光洁表面、计量包装、化验入库。
二、工艺流程图及生产原理：
铬铁生产原理，采用电硅热法生产铬铁原理是入炉铬矿中氧化铬，氧化亚铁在石灰溶剂的作用下，被硅（以硅铬合金的开工加入）还原，生成铬铁合金（cr-fe），从而得到微碳铬铁或中低碳铬铁产品。生产过程间断进行，渣铁混出，进行渣铁分离后，铁水经真空抽气处理使铬铁内部结构致密无气孔，然后浇注成铁板。冷却、精整、包装。
三、冶炼三分厂微碳铬铁、中低碳铬铁经济技术指标见（表4-4、4-5、4-6、4-7、4-8）。
其中表（4-6、4-7、4-8）是冶炼三分厂1984年前电炉生产周期，炉龄和料批的情况对比，近年由于生产采用硅铬堆底法新工艺，在提高产品质量，产量的前提下，炉龄不作主要因素考虑，故未作统计。
表4-03
微碳铬铁历年经济技术指标
年份
名称利用
弋/mva昼夜作业率
%平均功率
kw/h合格率
%品率
%铬回收率
%平均日产
弋/d单位电耗
kwh/弋铬矿单耗
弋/弋硅铬单耗
弋/弋石灰单耗
弋/弋含磷
%
19632.80585.58153398.4779.989.82937892.2710.9861.904
19642.91855.36199197.0674.8382.5515.82530211.3298.5401.273
19653.76383.12210998.0094.0184.72
74.5113.5802886
41131.310
1.8190.527
0.5421.204
1.464
19664.05093.07208398.2879.4677.8813.06038251.6190.5201.382
19673.17384.76195597.8876.9176.1511.17142001.6540.5301.412
19683.20378.59194897.7044.3074.8511.14541941.5570.5491.391
196997.5767.2574.1740411.6920.5731.428
197096.4849.1268.7241471.7940.5831.616
19713.22185.85410397.2829.8966.9211.62546971.9130.6101.696
19723.28182.95203096.7549.6371.7911.2743251.8670.5991.568
19733.44587.12200397.1554.4082.7212.98039861.6210.5351.322
19743.49974.15220896.2080.4181.3213.76238361.5550.5401.279
19753.41865.03230697.5070.5878.5011.55839041.5150.5091.230
19763.76866.35>97.8073.5084.2016.01133031.5780.5301.258
19774.03067.49255496.9443.0782.9818.77728681.4480.5171.121
19784.55359.61236498.3888.7482.1823.76225481.4520.5201.135
19795.36960.77235299.2184.9981.9726.50921691.4420.5201.170
19806.38871.47227399.7886.1482.4126.82120571.4160.5191.161
19813.78251.05238399.4391.3078.7621.54825811.5560.5731.367
19823.02440.66247099.2884.8480.8522.14726511.4730.5611.302
19835.02250.49254999.6393.4282.2129.44420781.3530.5301.162
19844.31741.54197299.7490.6283.5730.55617861.2690.5251.180
19853.58831.88250199.5488.7585.6131.00619421.1800.5171.154
19863.77441.44249099.5283.3484.2829.28420501.2100.5171.179
19873.66736.36259899.7168.9184.9329.96320771.2210.5311.215
19884.00736.73256999.7780.6584.4130.88419871.2090.5411.179
19894.03340.36258599.7079.0883.9429.98820581.2140.5341.24199.75
说明：本表数据由计调处提供。
表4-04
中低碳铬铁历年经济技术指标
年份
名称合格率
（%）铬回收率
（%）铬矿单耗
（公斤/吨）硅铬单耗
（公斤/吨）石灰单耗
（公斤/吨）单位电耗
（/吨）平均日产
（吨/日）含磷率
（%）
197392.6987.26151051812623234
197496.0080.09164054713523591
197596.9984.61143550511793162
197695.4879.82150254712383320
197795.5687.27136948410732605
197898.9687.60135049110832170
197998.7986.52129852711641917
198098.2985.99131050910701841
198199.1979.96149656213072558
198299.3783.16138754011942699
198399.6483.03126751910311896
198499.9484.22116651610991786
198510085.95110750610501800
198699.5984.76118145511741951
198799.9787.2711635251138192929.882
198899.9086.49118752811171902
198999.4684.6511505381189199831.62399.70
说明：本表数据由计调处提供。