机械活化烧结粉尘和高炉粉尘的物理化学性质

发布时间：2018-01-14 08:26

本文关键词：机械活化烧结粉尘和高炉粉尘的物理化学性质　出处：《钢铁》2017年04期 　论文类型：期刊论文

【摘要】：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4.8×10~(14)m/m~3,无定形化分数为21.3%,总储能为126 k J/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9.8×10~(14)m/m~3,无定形化分数为14.8%,总储能为229 k J/mol。
[Abstract]:In the iron and steel industry "zero emissions" in the pursuit of philosophy, sintering dust and blast furnace dust is an important resource of the ironmaking plant two times. The two kinds of dust particles and has the characteristics of complete crystallization and low surface activity experienced a high temperature smelting process. In the two media of air and water, using a planetary ball mill. The laser particle size, scanning electron microscope, X ray diffraction and infrared spectroscopy study mechanism of activated sintering and blast furnace dust dust machine. The results of the study show that, with the gradual increase of activation time, particle size of two kinds of dust are reduced gradually. The hematite mineral phase peak intensity gradually weakened, the crystallite size decreases and the lattice distortion. The dislocation density of the amorphous fraction and the mechanical energy increased gradually; wet grinding is better sintering and blast furnace dust dust, more suitable for dry grinding; sintering dust particles activated more easily than blast furnace dust particles Agglomeration; wet grinding on the planet of 30 min, the average particle size of sintering dust can reach 3.3 m, while the grain size decreased 40%, the dislocation density is 4.8 * 10~ (14) m/m~3, the amorphous fraction is 21.3%, the total energy of 126 K J/mol; 30 min dry grinding on the planet under the condition, the average particle size of blast furnace dust can reach 4.1 m, while the grain size decreased 28%, the dislocation density is 9.8 * 10~ (14) m/m~3, the amorphous fraction is 14.8%, the total energy of 229 K J/mol.

【作者单位】：北京科技大学冶金与生态工程学院;江西理工大学冶金与化学工程学院;
【基金】：国家自然科学基金资助项目(U1260202)
【分类号】：X757
【正文快照】： 高炉炼铁流程会产生大量含钾、钠和锌的粉尘,高炉对自身产生粉尘的二次利用率较低。这些粉尘除堆放占用大量土地外,粉尘内含有一定量的锌和铅还会造成地下水污染等生态问题,而进一步处理高炉粉尘的费用高,得到的金属价格低,且增加炼铁成本。炼铁粉尘中最具代表性的当属烧结粉

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