Mechanism and Prevention of Disintegration of AOD Stainless Steel Slag

During the cooling process of AOD（argon-oxygen decarburization）stainless steel slag,the serious disintegrating problem happened,which will cause serious environmental pollution.The disintegrating mechanism of the AOD slag was analyzed in detail,and experimental research on prevention of disintegrating of AOD stainless steel slag was developed by adjusting the basicity of the slag and adding the quartz sand and borax.The disintegrating problem during the cooling process of AOD stainless steel slag is caused by the 2CaO·SiO2phase transformation fromα＇-C2S toγ-C2S.By means of adjusting the basicity of the AOD stainless steel slag from 2to 1.5by adding quartz sand,disintegrating of slag was prevented.But the adding amount must arrive at 15% which increases the difficulty of industrialization.Disintegration of AOD stainless steel slag can be effectively controlled by adding borax,and the adding amount is only 0.5%-0.8%.This method can be easily industrialized.

AOD不锈钢渣粉化机理及抑制粉化实验研究

分析了AOD不锈钢渣的粉化机理，并通过添加石英砂调整渣碱度和添加硼砂渣改性处理对抑制AOD不锈钢冷却过程中的粉化问题进行了实验研究。研究认为，2CaO·SiO2相由α-C2S相向γ-C2S相的转变．是不锈钢渣冷却过程中导致粉化、扬尘的主要原因。通过添加石英砂将AOD渣碱度由2．0调整到1．5以下，可以抑制AOD不锈钢渣的粉化。该方法成本低，但配加量需达15％，加大了工业化难度；采用配加微量硼砂的改性方式．不仅可有效地抑制AOD不锈钢渣粉化、扬尘，而且加入量仅为0．5％～0．8％．便于实现工业化，但成本较高。