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 60Si

2

Mn 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.