Knowledge Management System Of Institute of process engineering,CAS
| 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 Publication | MINERALS ENGINEERING
 |
| ISSN | 0892-6875 |
| Volume | 172Pages:8 |
| Abstract | Secondary 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. |
| Keyword | Aluminum dross Harmless treatment Fluorides Process intensification Mechanism |
| DOI | 10.1016/j.mineng.2021.107134 |
| Language | 英语 |
| WOS Keyword | SPENT CATHODE CARBON ; RAW-MATERIAL ; RECOVERY ; FLUORIDE ; OPTIMIZATION ; LIMESTONE ; REMOVAL ; WASTE |
| Funding Project | key 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 Area | Engineering ; Mineralogy ; Mining & Mineral Processing |
| WOS Subject | Engineering, Chemical ; Mineralogy ; Mining & Mineral Processing |
| Funding Organization | key R&D and Promotion Special Projects of Henan Province ; Key Deployment Projects of Chinese Academy of Sciences ; National key Technologies RD Programs |
| WOS ID | WOS:000697514400001 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/50221 |
| Collection | 中国科学院过程工程研究所 |
| Corresponding Author | Guo, Qiang; Li, Yongli; Ren, Baozeng |
| Affiliation | 1.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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