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Innovative technology for defluorination of secondary aluminum dross by alkali leaching
Gao, Qin2,3; Guo, Qiang1; Li, Yongli1; Ren, Baozeng2; Fu, Mingbo3; Li, Huilin3; Tian, Dengchao3; Ding, Min2
2021-10-01
Source PublicationMINERALS ENGINEERING
ISSN0892-6875
Volume172Pages:8
AbstractSecondary aluminum dross (SAD) contains harmful fluorides, so it requires a harmless treatment before recy-cling. In this paper, an innovative SAD defluorination technology was developed. It extracts all the soluble so-dium fluoride and active cryolite of SAD; besides, it can also stabilize the harmful fluorides towards deep detoxification. The defluorination process gave a novel idea for the comprehensive wet processing treatment of SAD. A NaOH solution was used to leach active fluorides, including cryolite and soluble fluorides, from SAD. The Effects of NaOH concentration, temperature, liquid-to-solid ratio, and leaching time on the fluoride leaching rate were investigated. The leaching rate of active fluorides was 95.8% at a NaOH concentration of 10 wt%, a leaching temperature of 80 degrees C, a liquid-to-solid ratio of 4, and a leaching time of 20 min. The kinetic analysis showed that the fluoride leaching occurred according to the hybrid control model of solid product layer in -diffusion and interfacial chemical reaction. The apparent activation energy was 39.64 kJ/mol. Meanwhile, 99.9% of fluoride ions in the alkaline solution were converted into CaF2 by adding CaO, stabilizing the active fluorides. The concentration of fluorides in the alkaline solution was 5.944 mg/L, satisfying the Chinese National Standard.
KeywordAluminum dross Harmless treatment Fluorides Process intensification Mechanism
DOI10.1016/j.mineng.2021.107134
Language英语
WOS KeywordSPENT CATHODE CARBON ; RAW-MATERIAL ; RECOVERY ; FLUORIDE ; OPTIMIZATION ; LIMESTONE ; REMOVAL ; WASTE
Funding Projectkey R&D and Promotion Special Projects of Henan Province[212102310066] ; Key Deployment Projects of Chinese Academy of Sciences[ZDRWZS201811] ; National key Technologies RD Programs[2020YFC1909603]
WOS Research AreaEngineering ; Mineralogy ; Mining & Mineral Processing
WOS SubjectEngineering, Chemical ; Mineralogy ; Mining & Mineral Processing
Funding Organizationkey R&D and Promotion Special Projects of Henan Province ; Key Deployment Projects of Chinese Academy of Sciences ; National key Technologies RD Programs
WOS IDWOS:000697514400001
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/50221
Collection中国科学院过程工程研究所
Corresponding AuthorGuo, Qiang; Li, Yongli; Ren, Baozeng
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
2.Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450000, Peoples R China
3.Zhengzhou Inst Emerging Ind Technol, Zhengzhou 450003, Peoples R China
Recommended Citation
GB/T 7714
Gao, Qin,Guo, Qiang,Li, Yongli,et al. Innovative technology for defluorination of secondary aluminum dross by alkali leaching[J]. MINERALS ENGINEERING,2021,172:8.
APA Gao, Qin.,Guo, Qiang.,Li, Yongli.,Ren, Baozeng.,Fu, Mingbo.,...&Ding, Min.(2021).Innovative technology for defluorination of secondary aluminum dross by alkali leaching.MINERALS ENGINEERING,172,8.
MLA Gao, Qin,et al."Innovative technology for defluorination of secondary aluminum dross by alkali leaching".MINERALS ENGINEERING 172(2021):8.
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