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上钢五厂二车间电炉冶炼优质碳素结构钢采用的低碱度渣快速还原工艺,具有成渣快、流动性好、脱硫效率高、合金回收稳定等特点。统计表明:与传统的白渣工艺相比较,本工艺可缩短冶炼时间15分/炉,提高电炉生产率12.54%;电耗降低27.51度/吨钢;炉龄提高20%;生产成本降低3.83元/吨钢。本文对低碱度渣的主要特性及渣中各组元的行为作理论分析和计算,说明在低碱度渣下,主要依靠铝的沉淀脱氧作用,硅、锰元素回收稳定;渣-钢间硫的分配比可达20左右,实际脱硫效率约为60～80%。质量检验表明:钢的化学成份稳定;低倍组织正常;钢中含氮和氢量较低;非金夹杂物级别较低,主要为钙铝酸盐和硫化钙;钢材的机械性能稍优于白渣冶炼的钢。
The second plant on the steel plant furnace smelting quality carbon structural steel high-quality low-basicity slag rapid reduction process, with slag fast, good liquidity, high desulfurization efficiency, alloy recovery and stability characteristics. The results show that the process can shorten the smelting time by 15 minutes / furnace, increase the electric furnace productivity by 12.54%, reduce the power consumption by 27.51 degrees per ton of steel, increase the furnace age by 20% and reduce the production cost by 3.83 yuan / Tons of steel. In this paper, the main characteristics of low-alkalinity slag and the behavior of each component in slag are theoretically analyzed and calculated, which shows that under the condition of low alkalinity slag, the deoxidation mainly depends on the deposition of aluminum and the recovery of silicon and manganese is stable. Sulfur distribution ratio of up to about 20, the actual desulfurization efficiency of about 60 to 80%. The quality inspection showed that the chemical composition of the steel was stable, the microstructure at low magnification was normal, the content of nitrogen and hydrogen in the steel was low, the content of non-gold inclusions was low, mainly calcium aluminate and calcium sulfide. The mechanical properties of the steel were slightly better than White slag smelting steel.