材料期刊网

在当代钢铁工业"零排放"的追求理念下,烧结粉尘和高炉粉尘是炼铁厂重要的二次资源.这两种粉尘颗粒因经历过高温冶炼过程而具有结晶完整及表面活性低的特点.在空气和水两种介质下,利用行星球磨机,采用激光粒度、扫描电镜、X射线衍射和红外光谱等手段考察了烧结粉尘和高炉粉尘的机械活化机制.研究结果表明,随着活化时间的逐渐延长,两种粉尘的粒度均逐渐减小,赤铁矿物相峰强逐渐减弱,晶块尺寸逐渐减小,晶格畸变、位错密度、无定形化分数和机械力储能逐渐增加;烧结粉尘的湿磨效果较好,而高炉粉尘更适合于干磨;活化后的烧结粉尘颗粒比高炉粉尘颗粒更易发生团聚;在行星湿磨30 min的条件下,烧结粉尘的平均粒度即可达到3.3μm,同时其晶块尺寸减小40%,位错密度为4.8×1014 m/m3,无定形化分数为21.3%,总储能为126 kJ/mol;在行星干磨30 min的条件下,高炉粉尘的平均粒度即可达到4.1μm,同时其晶块尺寸减小28%,位错密度为9.8×1014 m/m3,无定形化分数为14.8%,总储能为229 kJ/mol.

Nowadays,in order to achieve the goal of zero-waste in the steel industry,sintering dust and blast furnace dust are recognized as two kinds of significant secondary resources. Owe to the fact that the dusts have undergone some extent of high temperature processing,their particles have perfect crystalline and low surface activity. Under air and de-ionized water milling condition,the planetary milling activation mechanism of sintering dust and blast furnace dust were investigated by using granulometry analysis,X-ray diffraction (XRD),scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results show that along with the milling progresses,the mean particle size and the crystallite lattice size decrease gradually. Meanwhile,the hematite phase diffraction peaks continuously broaden, the lattice distortion,the dislocation density,the factional amorphization and stored energy increase gradually. For sinter-ing dust,the effect of wet grinding is superior. For blast furnace dust,the effect of dry grinding is superior. The particles of activated sintering dust are more likely to reunion together than activated blast furnace dust. After half an hour's plane-tary wet milling,the mean particle size of activated sintering dust decreases to 3.3μm,the corresponding crystallite lat-tice size decreases by 40%,the dislocation density and the factional amorphization are 4.8 × 1014 m/m3 and 21.3%,and the total stored energy is 126 kJ/mol. After half an hour,s planetary dry milling,the mean particle size of activated blast furnace dust decreases to 4.1μm,the crystallite lattice size decreases by 28%;the dislocation density and the factional amorphization are 9.8×1014 m/m3 and 14.8%and the total stored energy is 229 kJ/mol.