包钢低硅烧结矿的冶金性能

Metallurgical Property of Low Silicon Sinter in Baotou Iron and Steel(Group)

在通过红外微型烧结试验,确定温度、碱度、MgO含量及SiO2含量对包钢低硅烧结矿黏结相强度影响强弱顺序以及黏结相强度最优、较好、较差及最差的包钢低硅烧结工艺条件基础上,采用烧结杯对上述4种烧结矿的黏结相强度进行验证,并对其冶金性能进行研究。结果表明,低硅烧结的最佳工艺条件为:SiO2含量(质量分数,下同)4.0%、碱度2.5、MgO含量1.6%、配碳量3.8%。在此工艺条件下获得的包钢低硅烧结矿具有优良的冷态强度(转鼓强度83.1%),软熔滴落性能(tS为1 307.3℃,tD-tS为98℃)优于包钢烧结矿,还原性(RI为83.65%)较好。尽管低温还原粉化性与目前包钢烧结矿相当,但综合评价,包钢低硅烧结矿可以满足高炉炼铁的需求。

The metallurgical properties of low silicon sinters in Baotou Iron and Steel（Group） Co.were investigated by means of sinter pot test,and the sintering process of them had determined by mini-sintering test in previous research.Then the results were contrasted with the sinters utilized by BF ironmaking.The results shows that the optimal sintering process of Baogang low silicon sinter is SiO2 content 4.0%,basicity 2.5,MgO content 1.6%,carbon addition 3.8%,which behaves excellent cold strength（drum index 83.1%）,softening-melting properties（tS 1 307.3 ℃,tD-tS 98 ℃） and reducibility（RI 83.65%）.Although its low temperature reduction disintegration is close to that of the sinter being utilized at present,it can be satisfied with BF ironmaking.