A Primary Discussion on Flux Injection Into Blast Furnace via Tuyeres

Based on the mass balances of blast furnace,typical slag basicity was calculated and analyzed in different zones of the blast furnace.Analysis results show that,under large pulverized coal injection,the conventional bur- den induces the fluctuation of basicity of slag along the blast furnace height,the decrease of three-phase zone and the permeability of lower part of blast furnace.To solve the problem,injection of limes into the blast furnace in- stead of charging from the top could be a good solution.Once the charging of limes from the top is replaced by in- jection via the tuyeres,the smooth operation and increasing productivity of the blast furnace can be obtained,be- sides the decreasing bosh slag volume,the proper basicity of slag,the higher location of cohesive zone,the exten- ding of three-phase zone,the increasing of permeability and pulverized coal combustibility.