不同条件下石灰石煅烧的产物特性研究  

Characteristics of limestone calcined under different conditions

作　　者：冯佳[1,2] 胡龙飞[2] 朱少楠[2] 周宝[2] 李晨晓[2] 李宏[2] 

机构地区：[1]武钢研究院,湖北武汉430080 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《炼钢》2015年第6期73-78,共6页Steelmaking

基　　金：国家科技支撑计划(2012BAC27B02)

摘　　要：为比较"石灰煅烧—转炉炼钢"传统工艺和"转炉用石灰石代替石灰造渣炼钢"新工艺中石灰的特性,归纳了2种工艺中石灰石受热历程分别为"低温长时间+降温+高温短时间"和"高温短时间"。把块状石灰石看作由无数薄层构成,用薄片状石灰石模拟块状中单个薄层,将其在不同条件下煅烧,测量产物收缩率、比表面积、孔容积、孔径、晶体结构及水化活性等参数。结果表明,相对于"低温长时间"及"低温长时间+降温+高温短时间"的试样,"高温短时间"煅烧的试样收缩率低、比表面积和孔容积大、平均孔径小、晶粒细小、晶格畸变大、水化反应速度极快。石灰石造渣工艺中高温下新生成的石灰反应活性高于传统工艺,有利于其在渣中的溶解。In order to compare lime in the traditional process of ＂limestone calcination- BOF steelmaking＂ with that in the novel process of ＂limestone addition for BOF flu- xing＂, the thermal experience of limestone are described as ＂low temperature for long time ＋ cooling ＋ high temperature for short time＂ and ＂high temperature for short time＂, respectively. Limestone lump can be regarded as countless layers. Flake samples were subjected to different thermal experience and the measurement of shrinkage, specific surface area, pore volume and diameter, crystal structure and hydration reactivity to simulate a single layer of lump. The results showed samples calcined at ＂high tempera- ture for short time＂ are characterized by low shrinkage, high specific surface area and pore volume, small pore diameter, fine crystal grain size, high crystal distortion ratio and extraordinary high hydration reactivity compared with samples calcined at both ＂low temperature for long time＂ and ＂low temperature for long time ＋ cooling ＋ high tempera- ture for short time＂. It can be deduced that the newly generated lime at high tempera- ture in the novel process should be with higher reactivity, which is favorable for the dis- solution in slag.

关 键 词：转炉 石灰石 石灰 造渣 活性 

分 类 号：TF702.5[冶金工程—钢铁冶金]