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Preparation of calcium aluminate by passivation-acid modulation coupling control of secondary aluminum dross
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-18 , DOI: 10.1016/j.seppur.2024.130830 Zhengping Zuo, Yuqin Zhao, Huiyi Zhang, Shaopeng Li, Zhanbing Li, Wenfen Wu, Huiquan Li, Jianbo Zhang
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-18 , DOI: 10.1016/j.seppur.2024.130830 Zhengping Zuo, Yuqin Zhao, Huiyi Zhang, Shaopeng Li, Zhanbing Li, Wenfen Wu, Huiquan Li, Jianbo Zhang
Reusing and recycling secondary aluminum dross represents a significant challenge to achieving sustainability in the modern aluminum industry. In the present work, an approach was put forth to valorize secondary aluminum dross to produce calcium aluminate for use in water treatment industry. The toxic elements present in secondary aluminum dross can be effectively eliminated through roasting passivation and acid digestion, resulting in removal rates of 98.58 % for nitrogen (N), 96.08 % for chlorine (Cl), and 45.8 % for fluorine (F). Meanwhile, the impurities were effectively reduced, decreasing Ca, S, Na, and K elements in the acidolytic residue to 0.45 %, 0.16 %, 0.09 %, and 0.03 %, respectively, while the concentrations of other impurities were found to be less than 0.5 %. The investigation was focused on the synthesis conditions, dissolution properties, and the mechanisms of mineral phase transformation for calcium aluminate. In the presence of low calcium levels, the combination of CaO, α-Al2O3, and SiO2 gave rise to the formation of Ca2Al2SiO7, CaAl2O4, and CaAl4O7. An increase in the amount of CaO resulted in the transformation of Ca2Al2SiO7 into Ca2SiO4, while CaAl2O4 and CaAl4O7 were converted to Ca12Al14O33. Furthermore, MgAl2O4 maintained stability throughout the entire process. Based on its reaction pathway, a method for calculating the requisite material ratios to synthesize calcium aluminate was developed, which resulted in a product that complied with the Chinese national standards. The study provides a theoretical foundation for developing the synthesis technology of calcium aluminate from the same type of hazardous solid waste.
更新日期：2024-12-19
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