Abstract: To develop and utilize aluminum-niobium slag,a kind of non-ferrous metallurgical waste residue produced in the preparation of metal niobium by the aluminothermic reduction method,the chemical composition,phase composition,microstructure and properties of aluminum-niobium slag were studied by ICP,XRD,SEM,TG-DTA and other characterization techniques.The results show that the oxidation of Nb and NbO leads to the poor volume thermal stability of aluminum-niobium slag.After heat treating the aluminum-niobium slag at different temperatures (400-1 500 ℃),it is found that high temperature pre-firing treatment can effectively solve the problem of poor volume thermal stability of the aluminum-niobium slag.After pre-firing at 1 400 ℃ or above,the aluminum-niobium slag has stable phase composition and volume change rate as well as the refractoriness >1 790 ℃,which meets the basic requirements of refractories for raw materials and lays a good foundation for its resource utilization.

Key words: aluminum-niobium slag, thermal stability, phase composition, resource utilization

摘要： 为开发利用铝热还原法制备金属铌工艺中产生的一种有色冶金废渣——铝铌渣,采用ICP、XRD、SEM、TG-DTA等表征技术对铝铌渣的化学组成、物相组成、显微结构及性能进行研究,结果发现,铝铌渣中Nb及NbO的氧化,导致铝铌渣的体积热稳定性非常差。将铝铌渣经400~1 500 ℃热处理后发现:高温预烧处理能有效解决铝铌渣体积热稳定性差的问题;经≥1 400 ℃预烧处理后,铝铌渣的物相组成、体积变化率均达稳定状态,且耐火度大于1 790 ℃,满足耐火材料对原料的基本要求,为其资源化利用奠定了良好的基础。

关键词: 铝铌渣, 热稳定性, 物相组成, 资源化利用