| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
LI Yong, PENG Li, WANG Haibin, QIN Ziyi, QU Yi, LI Yonggang, LI Chunlei, WANG Yi. Study on Removal of Fluoride and Nitride in Secondary Aluminum Dross by High Temperature Roasting[J]. Conservation and Utilization of Mineral Resources, 2020, 40(6): 133-140. doi: 10.13779/j.cnki.issn1001-0076.2020.06.019
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Study on Removal of Fluoride and Nitride in Secondary Aluminum Dross by High Temperature Roasting
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Abstract
Ammonia caused by aluminum nitride being damp and fluoride pollution of groundwater are the main reasons why aluminum dross becomes a hazardous solid waste.In order to remove aluminum nitride and fluoride in aluminum dross, the purpose of harmless reduction of aluminum dross is achieved.Using the process of adding calcium salt for high-temperature roasting and washing recovery, the effects of roasting temperature and the quality of added calcium salt on the denitrification and fluoride fixation of aluminum dross were studied.The results showed that the addition of CaCl2 with a mass fraction of 3% as a fluorine-fixing agent, a roasting temperature of 1 300 ℃, and a roasting time of 4 h, under these conditions, the content of aluminum dross nitrogen decreased to 0%, reduced the aluminum dross gas release to 2 mL/g and soluble fluoride ion concentration to 6.71 mg/L, the weight loss of aluminum dross is 13.44%.The aluminum dross calcined under this condition was washed with water, and the remaining inorganic salt components were recovered with a recovery rate of 84%. The research provides a new idea for the harmless reduction and recycling of aluminum dross.
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Keywords:
- secondary aluminum dross /
- aluminum nitride /
- harmless /
- high-temperature roasting
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References
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LI Yong, PENG Li, WANG Haibin, QIN Ziyi, QU Yi, LI Yonggang, LI Chunlei, WANG Yi. Study on Removal of Fluoride and Nitride in Secondary Aluminum Dross by High Temperature Roasting[J]. Conservation and Utilization of Mineral Resources, 2020, 40(6): 133-140. doi: 10.13779/j.cnki.issn1001-0076.2020.06.019
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Figure 1.
(a)Size distribution of SAD; (b)XRD of SAD
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Figure 2.
The change of (a)Enthalpy and(b)Gibbs function of roasting reaction with temperature
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Figure 3.
Influence of roasting temperature on Roasted aluminum dross mass change rate
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Figure 4.
The appearance of(a)SAD particles, (b)Roasted particles at 1 300 ℃; (c)Roasted particles at 1 400 ℃
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Figure 5.
(a)Reaction mechanism diagram of O2 and AlN in high temperature roasting; (b)Model diagram of roasting O2 and AlN reaction
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Figure 6.
(a)XRD of roasted aluminum dross at different temperatures; (b)Thermal analysis diagram of SAD (TG-DSC)
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Figure 7.
Effect of roasting temperature on the content of N and C elements in Aluminum dross
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Figure 8.
Influence of roasting temperature on (a)aluminum dross reactivity and (b)soluble fluorine concentration
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Figure 9.
Effect of CaCl2 addition amount on the concentration of soluble fluoride in SAD
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Figure 10.
(a)Influence of CaCl2 addition on roasted aluminum dross mass change rate; (b)Roasted aluminum dross thermal analysis diagram (TG-DSC) with 3% CaCl2 added
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Figure 11.
XRD of the washed crystal solid