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1989年大板坯连铸机投产后,首要问题是如何提高罐温。初步估算,罐温须在原有基础上提高50～70℃,出钢温度必须相应提高。如此将会影响炉衬寿命并降低废钢比。目前第三炼钢厂操作条件满足不了连铸生产要求,主要原因是白灰生烧率高,降温严重;白灰超量;个别炉次铁水温度偏低;停炉时间长。为此,应向转炉提供精料;稳定各种原料的装入量;减少白灰用量;减少渣量;控制跑渣;缩短冶炼周期,确保多炉连浇;缩短出钢时间,控制钢水运输过程温降,加强大罐管理;提供优质钢水,保证连铸生产;向转炉内投入焦炭球团,提高熔池温度。采用上述措施后,转炉可以在废钢比12％左右的条件下向连铸提供合适温度的钢水。
After the slab caster was put into production in 1989, the primary issue is how to raise the tank temperature. Preliminary estimates, the tank temperature must be increased on the basis of the original 50 ~ 70 ℃, tapping temperature must be increased accordingly. This will affect the lining life and reduce the scrap ratio. The current third steel mill operating conditions can not meet the requirements of continuous casting, the main reason is the high burning rate of white ash, severe cooling; excess lime; individual furnace hot metal temperature is too low; shutdown a long time. To this end, we should provide the concentrate to the converter, stabilize the loading of various raw materials, reduce the amount of white ash, reduce the amount of slag, control the run-off slag, shorten the smelting cycle and ensure the continuous pouring of multiple furnaces, shorten the tapping time and control the transport of molten steel Temperature drop, strengthen the management of large tanks; provide high-quality molten steel to ensure continuous casting production; put into the converter coke pellets, increase the temperature of the molten pool. After adopting the above measures, the converter can provide molten steel with suitable temperature to the continuous casting under the condition that the scrap ratio is about 12%.