第三节 工艺流程及经济技术指标

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  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。

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