为明确轧钢油泥在回转窑内中的结圈原因和结圈特性，采用一种氧化球团回转窑结圈特性评价方法，对轧钢油泥在不同工况下的黏结行为进行研究，并通过灰熔融温度、粉末X射线荧光光谱(XRF)、粉末X射线衍射光谱（XRD）、块状扫描电子显微镜(SEM)和能谱分析仪(EDS)对结圈物的物相组成和形貌进行表征测试。以结圈指数和黏附指数为评价指标，考察了焙烧温度和焙烧时间对轧钢油泥在耐火砖表面黏结性能的影响。研究表明轧钢油泥的结圈指数和黏附指数随焙烧时间和焙烧温度的增加而增加；1 150～1 250 ℃时增长速度最快，与实际回转窑中主要结圈物情况相吻合，间接证实了该方法对评价结圈行为的适用性。结果表明，结圈物的矿相晶粒粗大、结构不均匀、空隙较多，单个颗粒晶体分布明显且表面主要呈熔蚀状，整体上多晶粒关联性的结晶程度不高。轧钢油泥回转窑结圈主要是Fe2O3固相固结反应，余下的少量杂质生成了低熔点物质，一定程度上促进了铁晶粒的迁移，加剧了结圈行为，这与XRD检测到的结圈物的物相主要是赤铁矿，其次是磁铁矿等铁氧化物和低熔点物质相吻合。灰熔融温度测试中结圈物的变形温度和软化温度总体上升，进一步证明氧化环境下二次生成的Fe2O3和生成的Fe3O4再结晶作用使结圈物强度更高且不易破碎。

In order to clarify the causes and caking characteristics of steel rolling oil sludge in the rotary kiln, an evaluation method of ring formation characteristics in the rotary kiln of oxidation pellets was used to study the cohering behavior of steel rolling oil sludge under different working conditions.The physical composition and morphology of the crystalline ring products were characterized and tested by ash melting point, powder X-ray fluorescence spectroscopy XRF, powder X-ray diffraction spectroscopy (XRD), bulk scanning electron microscopy (SEM) and energy spectrum analyzer (EDS). The effects of roasting temperature and roasting time on the cohering properties of the rolled oil steel sludge on the refractory brick surface were investigated by using ring index and adhesion index as evaluation indexes. The results show that the ringing index and adhesion index of steel rolling oil sludge increase with the increase of roasting time and roasting temperature.The fastest growth rate is in the range of 1 150 ℃ to 1 250 ℃, which coincides with the dense distribution of the main ringing materials in the kiln, indirectly confirming the applicability of the method for evaluating the ringing behavior. The characterization results show that the mineral phase of the crystalline material has coarse grains, the uneven structure, more voids, the obvious distribution of individual grain crystals and the fused surface, and the low degree of crystallization of the whole.The ring-forming process of steel rolling oil sludge rotary kiln are mainly due to the solid-phase solidification reaction of Fe2O3, and the remaining small amount of impurities generate low melting point substances, which to a certain extent promote the migration of iron grains and intensify the ring-forming behavior.That is consistent with the XRD detection that the physical phase of the rings is mainly hematite, followed by iron oxides such as magnetite and low melting point substances.The deformation temperature and softening temperature of the rings in the gray melting point test are generally increasing, which further proves that the recrystallization of secondary Fe2O3 and generated Fe3O4 in the oxidizing environment makes the rings stronger and less fragile,thus causing the evolution of the ring to deteriorate.

0 引言

1 试验

   1.1 原料性能

   1.2 模拟轧钢油泥窑内燃煤中黏结方法

   1.3 研究方法

   1.4 表征测试

2 结果与讨论

   2.1 不同工况条件对轧钢油泥黏结行为的影响

   2.2 结圈物特性研究

3 结论