Study on factors affecting rare earth leaching rate in acid leaching process of fly ash

Study on factors affecting rare earth leaching rate in acid leaching process of fly ash

Chuan Ren¹, Yanheng Li^1*, Jianqi Man¹, Wenhui Li¹, Lufan Chang¹, Xin Zhao¹

¹School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, China.

There is a large amount of enrichment of rare earth elements in Zhungeer coal and coal ash, making it possible to use fly ash as a source for industrial production of rare earth elements. In order to optimize the leaching process of rare earth elements in fly ash and increase the leaching rate, the circulating fluidized bed fly ash of Zhungeer Power Plant was used as the material, and the single factor test and orthogonal test were used to influence the leaching rate of rare earth elements in the acid leaching process of fly ash The factors were discussed, and the results showed that when fly ash and 3mol/L hydrochloric acid were leached at a ratio of 1:10 for 2h at 130 0C, the element leaching effect was the best, and the leaching rate could reach 97%.

Keywords: Fly ash, Hydrochloric acid, Rare earth, Leaching rate

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1. Huang Xiaowei, ZHANG Yongqi, Li Hongwei. China science foundation, 2011,25(03):134-137. (in Chinese)
2. Ji Genyuan, Zhang Hongping, Li Qiuling, Xia Haodong. Status quo and sustainable develop-ment countermeasures of rare earth mineral re-sources in China [J]. China mining, 2018,27(08): 9-16.
3. Wu Di, Qian Guixia. Rare earth, 2014,35(05): 104-112. (in Chinese)
4. The National Development and Reform Commis-sion issued the guidance on comprehensive Uti-lization of Resources in the 11th Five-Year Plan [J]. Comprehensive Utilization of Resources in China, 2007(02):1.
5. B. Mahalingam,K. Nagamani,L.S. Kannan,K. Mohammed Haneefa,A. Bahurudeen. Assess-ment of hardened characteristics of raw fly ash blended self-compacting concrete[J]. Perspec-tives in Science,2016,8.
6. Yuzhuang Sun, Cunliang Zhao, Jianya Zhang, Jingjing Yang, Yanzhong Zhang, Yue Yuan, Jing Xu, Dujuan Duan. Concentrations of Valuable Elements of the Coals from the Pingshuo Mining District, Ningwu Coalfield, Northern China[J]. Energy Exploration & Exploitation,2013,31(5).
7. SUN Yuzhuang, ZHAO Cunliang, LI Yanheng, WANG Jinxi, ZHANG Jianya, JIN Zhe, LIN Min-gyue, Wolfgang KALKREUTH. Further Infor-mation of the Associated Li Deposits in the No.6 Coal Seam at Jungar Coalfield, Inner Mongolia, Northern China[J]. Acta Geologica Sinica(English Edition),2013,87(04):1097-1108.
8. Yuzhuang Sun, Jingjing Yang, Cunliang Zhao. Minimum Mining Grade of Associated Li Deposits in Coal Seams[J]. Energy Exploration & Exploi-tation,2012,30(2).
9. Sun Yuzhuang, Zhao Cunliang, Li Yanheng, Wang Jinxi. Journal of China coal society, 2014,39(04):744-748.
10. Liu Huidong, Tian Heming, ZOU Jianhua. Extrac-tion of rare metal gallium-niobium-rare earth from fly ash [J]. Science & technology review, 2015,33(11):39-43.
11. Wang Hongbin, DU Yanxia, Wang Yongwang. Acid soluble “fly ash” step in the process of extracting alumina scandium [J/OL]. The distribution of rare earth: 1-6 [2020-09-25]. https://doi.org/10.16533/J.CNKI.15-1099/TF.20200046.
12. Ji Wanshun, Zhou Changchun, Pan Jinhe, CAO Shanshan, Tang Mengcheng, Hu Tingting. Ex-traction and separation of yttrium from fly ash leaching solution [J]. Journal of henan university of technology (natural science edition),2020,39 (02):62-68.
13. Qian Jue Shi, Wu Chuanming, Wang Zhi. Mineral composition of fly ash (ⅰ) [J]. Comprehensive Utilization of Fly ash, 2001(01):26-31.
14. Qian Jue shi, Wang Zhi, Wu Chuanming. Mineral composition of fly ash (middle) [J]. Comprehen-sive Utilization of Fly ash, 2001(02):37-41.