Characteristics and Removal Process of Aluminum Nitride in Secondary Aluminum Dross: A Review
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摘要:
二次铝灰中的氮化铝遇水会释放出氨气是导致铝灰成为危险废弃物的主要原因，因此实现铝灰无害化及资源化对铝资源可持续发展具有重要意义。阐述了铝灰中氮化铝的来源及物理化学性质。重点介绍了氮化铝的两种不同转化行为：水解行为、氧化行为，详细介绍了氮化铝水解、氧化过程中产物的变化及影响因素。并依据氮化铝转化行为对比了目前铝灰湿法、火法除氮工艺的特点及不同，指出未来铝灰除氮工艺的研究方向不仅要着重在工艺方法上，还应关注到相关检测标准、工艺过程中产物的成分及工艺安全性上。
Abstract:The aluminum nitride in the secondary aluminum dross will release ammonia gas when it is contact with water, which is the main reason that the aluminum dross becomes a hazardous waste, therefore, the realization of the harmlessness and resourcezation of aluminum dross is of great significance to the sustainable development of aluminum resources. The source and physical and chemical properties of aluminum nitride in aluminum ash are described. The focus is on two different transformation behaviors of aluminum nitride: hydrolysis behavior and oxidation behavior. The composition of the product and influencing factors during the hydrolysis and oxidation of aluminum nitride are introduced in detail. According to the transformation behavior of aluminum nitride, the characteristics and differences of the current aluminum dross hydrometallurgy and pyrometallurgy nitrogen removal process are introduced, and the research direction of the future aluminum dross nitrogen removal process should not only focus on the process method, but also pay attention to the relevant testing standards, the composition of the product in the process and the safety of the process.
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Key words:
- secondary aluminum dross /
- aluminum nitride /
- harmless /
- high-temperature roasting
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表 1 不同条件下铝渣灰中AlN水解后的含量
Table 1. The content of AlN in aluminum slag ash after hydrolysis under different conditions
/% 温度 水解时间/h 0.5 4 8 12 16 20 24 室温 67.02 66.06 64.77 63.43 62.04 60.56 59.26 60 ℃ 66.78 63.71 59.45 58.45 53.90 49.40 44.81 80 ℃ 66.44 63.38 59.36 51.32 43.03 35.28 26.85 100 ℃ 64.62 45.43 30.06 15.46 8.38 0.67 0.00 煮沸 65.82 51.41 33.17 15.61 0.00 
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