烧结工艺优化的试验研究

Experimental Study on Optimization of Sintering Technology

针对湘钢采用高铁低硅烧结的特点,虽然提高了入炉烧结矿品位,但会使烧结矿强度、粒度、冶金性能等明显变差。采取添加蛇纹石的试验和生产,结果表明:烧结矿的SiO2含量略有提高,但改善了高铁低硅烧结矿中液相少、强度差的状况,使返矿率下降,固体燃耗量降低,烧结矿的还原性和软熔性能得到改善。针对湘钢高炉渣Al2O3含量高的实际情况,解决增加MgO会影响烧结矿强度的问题;工业试验表明:用轻烧白云石部分代替白云石对烧结矿的产量没有明显的影响,转鼓强度稍有提高,固体燃耗明显下降,高炉利用系数提高,焦比下降,炉渣流动性好。在降低烧结矿低温还原粉化率方面,喷洒约3%CaCl2溶液是非常有效的。

In spite of that charge quality for sintering was improved through using low silicon sinter, but the strength, size and metallurgical properties of sinter were deteriorated, It was found that serpentine addition makes liquid phase and strength increased, return fine and solid fuel consumption reduced and reduction-softening behavior of sinter improved, in spite of small increase of SiO2 in sinter. Due to high Al2O3 in blast furnace slag, and the influence of MgO in sinter on it＇s sinter strength was studied, the industrial experiment showed that replacement of dolomite with lightly fired dolomite partly has small effect on productivity, but the drum strength is increased, solid fuel consumption is reduced, the productivity of BF has increased with lower coke rate and the fluidity of slag is higher, Spraying with 3% CaCl2 reagent is very effective for RDI（reduction degradation index）.