关键词: 电弧炉, 脱磷, 喷吹, 复合粉剂, 成本

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