Abstract: The practical application of particle dephosphorization with compound injection agent on 130 t electric arc furnace is carried out. The composition of dephosphorization slag system in the oxidation period of electric furnace is designed, basicity of slag is controlled between 2.2-2. 8, and the content of iron oxide is controlled between 15% -20%. The composite powder of carbon powder (15% -20%), CaO powder (40% -60%), MgO powder (25% -30%) and CaC powder (5% - 10%) prepared in a certain proportion is injected with nitrogen as the carrier. After adopting the smelting process of injection compound injection agent on EAF steelmaking of 40Cr, 0.45C steel, 20CrMnTi and 60Si₂Mn etc alloy steels, the reaction area of flux is accelerated, the slag forming speed is improved, and various production indexes are improved. Among them, the power consumption per ton steel is reduced by 90 kWh/t, the steel material consumption per ton steel is reduced by 9. 3 kg/t, the flux consumption per ton steel is reduced by 4. 8 kg/t, the productivity is increased by 5% -6%, and the comprehensive production cost per ton of steel is reduced by 25 yuan/t.

Key words: Electric Arc Furnace , Dephosphorization , Injection , Composite Powder , Cost

摘要： 在130 t电弧炉上进行了复合喷吹剂喷吹微粒脱磷的实践应用。设计了电弧炉氧化期脱磷渣系的组成，炉渣碱度控制在2.2～2.8,氧化铁含量控制在15%～20%。并以氮气为载体喷吹按照一定比例配制的碳粉(15%～20%) 、CaO粉(40%～60%) 、MgO粉(25%～30%) 、CaC粉(5%～10%)的复合粉剂。40Cr、45钢、20CrMnTi和60Si2Mn等钢采用喷吹复合喷吹剂冶炼工艺后，加快了熔剂的反应面积，提高了成渣速度，各项生产指标得到了改善，其中吨钢电耗降低90 kWh/t,吨钢钢铁料消耗降低9.3 kg/t,吨钢熔剂消耗减少4.8 kg/t,生产率提高5%～6%,吨钢综合生产成本降低了25元/t。

关键词: 电弧炉, 脱磷, 喷吹, 复合粉剂, 成本