不锈钢渣基础性能研究及资源化利用风险评价

Basic research of stainless steel slag property and risk assessment on resource reclamation

针对不同工序不锈钢渣进行基础性能研究,应用化学分析、X射线衍射、扫描电镜、固体废弃物毒性浸出方法对不锈钢渣的成分、矿物组成及元素浸出特征进行分析。研究表明,不锈钢渣中主要矿物为Ca2SiO4;其中,电炉渣碱度最低,金属含量略高;LF渣、AOD渣和转炉渣性质类似,碱度高,易粉化为较小颗粒。电炉渣中铬浸出量远远高于其它渣种,存在一定浸出风险,故考虑其资源化利用的环境安全性,此类不锈钢渣应妥善处置。

Basic properties of stainless steel slag out of different production processes in- cluding contents, mineralogy and leaching characteristics of elements are researched by chemical analysis,XRD,SEM and solid waste-extraction procedure for leaching toxicity. Results indicate that the main mineral of the stainless steel slag is Ca2 SiO4in which the basicity of EAF slag is the lowest and has a higher metal content. The property of LF slag, AOD slag, LD slag is similar, have high basicity and is easy to be disintegrated into powder. The leaching amount of chromium in EAF slag is far more than the others. Tak- ing security of beneficial reuse into account, such stainless steel slag should be safely dis- posed because of the leaching risk.