棕刚玉渣的硬脂酸湿法改性

以棕刚玉渣、硬脂酸为原料,在乙醇体系中进行机械力化学改性研究。分别研究了球磨过程中球料比、球磨时间、转速、硬脂酸用量、浆料浓度等参数对实验样品亲油化度、活化指数的影响。在最佳工艺基础上进行了正交实验,实验结果表明,适宜条件为硬脂酸用量3.5%,球料比4∶1,球磨时间30 min,球磨转速450 r/min,浆料浓度25%时,实验样品的亲油化度和活化指数分别达到46.8%和100%,且完全疏水。

Process of aluminum dross recycling and life cycle assessment for Al-Si alloys and brown fused alumina

In 2008,around 596 000 t of aluminum dross was generated from secondary aluminum industry in China;however,it was not sufficiently recycled yet.Approximately 95% of the Al dross was land filled without innocent treatment.The purpose of this work is to investigate Al dross recycling by environmentally efficient and friendly methods.Two methods of Al dross recycling which could utilize Al dross efficiently were presented.High-quality aluminum-silicon alloys and brown fused alumina(BFA) were produced successfully by recycling Al dross.Then,life cycle assessment(LCA) was performed to evaluate environmental impact of two methods of Al dross recycling process.The results show that the two methods are reasonable and the average recovery rate of Al dross is up to 98%.As the LCA results indicate,they have some advantages such as less natural resource consumption and pollutant emissions,which efficiently relieves the burden on the environment in electrolytic aluminum and secondary aluminum industry.