摘要
建立了不锈钢渣的CaO-MgO-FeO-SiO2-Al2O3-Cr2O3六元渣系活度模型。基于共存理论的活度模型得出了渣系中主要组分及复合氧化物在不同条件下的活度。结果表明,原渣系中的Cr2O3主要形成了不稳定的CaCr2O4,在自然环境中可以被氧化为酸溶性的CaCrO4,从而释放出强毒性的Cr6+,因此不锈钢渣具有潜在毒性。温度、碱度以及渣中MgO、FeO都对Cr2O3进入尖晶石相中从而实现稳定解毒有影响。通过调节渣系成分和处理条件能够基本实现含铬废渣的无公害化。
Based on coexistence theory, a activity model on six components slag system of stainless steel slag was built. And the activity of each components of the slag system, such as CaO, MgO, FeO, SiO2, Al2O3 and Cr2O3, can be calculated in different conditions. The results show that Cr2O3 is mainly formed into CaCr2O4, which is unstable and can be oxidized to acid-soluble calcium chromate, the CaCrO4. It can release Cr^6+ with strong toxicity. So stainless steel slag has potential toxicity. Temperture, basicity, MgO and FeO are all have influence on stable detoxification of the slag by promoting Cr2O3 into spinel phase. Via adjusting composition and processing conditions, the goal of non-polluted can be reached.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2013年第7期5-10,共6页
Journal of Iron and Steel Research
基金
国家环保公益性行业科研专项课题(201209023)
国家自然科学基金资助项目(51144005)
关键词
不锈钢渣
六元渣系
活度模型
stainless steel slag
six components slag system
activity model