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利用锰矿洗炉是处理高炉炉缸堆积事故的重要方法之一。对MnO质量分数不同时的炉渣性能及其机理进行研究,应用熔体物性综合测定仪测定含MnO炉渣的黏度及熔化性温度,并提出稳定性指数的概念;使用X射线衍射仪(XRD)分析含MnO炉渣的物相组成;利用拉曼光谱仪研究含MnO炉渣的微观状态。试验结果表明,锰矿洗炉过程中,炉渣中MnO最佳质量分数应为1.5%左右,此种炉渣在1 480℃时的黏度为0.25 Pa·s左右,熔化性温度为1 340℃左右,稳定性较强,可以满足洗炉要求。锰矿洗炉的机理是炉渣中生成了锰橄榄石类硅酸盐低熔点物质,增大了液态炉渣的过热度;并且随着自由氧离子浓度的增加,其促使复杂硅氧四面体网络结构解聚为简单硅氧四面体结构,炉渣由复杂结构向简单结构发展,从而显著降低炉渣黏度,达到洗炉的目的。
Using manganese ore to wash the furnace is one of the important ways to deal with the blast furnace hearth accumulation accident. The properties and mechanism of slag with different content of MnO were studied. The viscosity and melting temperature of slag with MnO were determined by melt properties analyzer. The concept of stability index was also put forward. XRD (X-ray diffraction) Phase composition of MnO-containing slag; using Raman spectroscopy to study the microscopic state of MnO-containing slag. The results show that the optimum mass fraction of MnO in the slag should be about 1.5% in the process of manganese ore washing. The viscosity of this slag is about 0.25 Pa · s at 1 480 ℃, and the melting temperature is about 1340 ℃. Strong sex, to meet the requirements of wash. Manganese washing furnace mechanism is generated in the slag manganese peridotite silicate low melting point substance, increasing the superheat of liquid slag; and with the increase of free oxygen ion concentration, which prompted complex silicon tetrahedron network structure solution Aggregated as a simple silicon tetrahedron structure, the slag from the complex structure to the simple structure of development, thereby significantly reducing the viscosity of slag to achieve the purpose of wash.