Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process Optimization
To reveal how CaF<sub>2</sub> improves the dissolution ratios of aluminum and iron ions in coal gangue, CaF<sub>2</sub> and hydrochloric acid are used to extract Al<sup>3+</sup> and Fe<sup>3+</sup> from the coal gangue calcined powder. The leaching rat...
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| Online Access: | https://www.mdpi.com/1996-1944/16/2/499 |
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| author | Deshun Kong Zihan Zhou Shuojiang Song Rongli Jiang |
| author_facet | Deshun Kong Zihan Zhou Shuojiang Song Rongli Jiang |
| author_sort | Deshun Kong |
| collection | DOAJ |
| description | To reveal how CaF<sub>2</sub> improves the dissolution ratios of aluminum and iron ions in coal gangue, CaF<sub>2</sub> and hydrochloric acid are used to extract Al<sup>3+</sup> and Fe<sup>3+</sup> from the coal gangue calcined powder. The leaching ratios of Al<sup>3+</sup> and Fe<sup>3+</sup> are measured, and the filter residues are analyzed by BET, XRD, and SEM. The results show that adding 3% CaF<sub>2</sub> could increase the extraction ratio of Al<sup>3+</sup> from 62.96% to 92.10% under optimized conditions, and that of Fe<sup>3+</sup> is increased from 85.12% to 95.73%. The mechanism of CaF<sub>2</sub> as an auxiliary to improve the leaching ratio of Fe<sup>3+</sup> is that HF reacts with the thin layers of gangue calcined powder containing silica to form soluble SiF<sub>4</sub>, thus forming pores that promote the diffusion of H<sup>+</sup> and inner ions, improving the leaching ratios of Al<sup>3+</sup> and Fe<sup>3+</sup>. Finally, the CaF<sub>2-</sub>assisted acid leaching process is optimized. The results showed that it is efficient and feasible to extract Al<sup>3+</sup> and Fe<sup>3+</sup> with the assistance of CaF<sub>2</sub> and that HF has a catalytic effect in the reaction system. This work provides a reference for the next step of actual production. |
| first_indexed | 2024-03-09T11:51:10Z |
| format | Article |
| id | doaj.art-22299c552f194089a7b33ffc34138060 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:51:10Z |
| publishDate | 2023-01-01 |
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| series | Materials |
| spelling | doaj.art-22299c552f194089a7b33ffc341380602023-11-30T23:14:06ZengMDPI AGMaterials1996-19442023-01-0116249910.3390/ma16020499Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process OptimizationDeshun Kong0Zihan Zhou1Shuojiang Song2Rongli Jiang3Guizhou Provincial Key Laboratory of Coal Clean Utilization, School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221016, ChinaGuizhou Provincial Key Laboratory of Coal Clean Utilization, School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221016, ChinaTo reveal how CaF<sub>2</sub> improves the dissolution ratios of aluminum and iron ions in coal gangue, CaF<sub>2</sub> and hydrochloric acid are used to extract Al<sup>3+</sup> and Fe<sup>3+</sup> from the coal gangue calcined powder. The leaching ratios of Al<sup>3+</sup> and Fe<sup>3+</sup> are measured, and the filter residues are analyzed by BET, XRD, and SEM. The results show that adding 3% CaF<sub>2</sub> could increase the extraction ratio of Al<sup>3+</sup> from 62.96% to 92.10% under optimized conditions, and that of Fe<sup>3+</sup> is increased from 85.12% to 95.73%. The mechanism of CaF<sub>2</sub> as an auxiliary to improve the leaching ratio of Fe<sup>3+</sup> is that HF reacts with the thin layers of gangue calcined powder containing silica to form soluble SiF<sub>4</sub>, thus forming pores that promote the diffusion of H<sup>+</sup> and inner ions, improving the leaching ratios of Al<sup>3+</sup> and Fe<sup>3+</sup>. Finally, the CaF<sub>2-</sub>assisted acid leaching process is optimized. The results showed that it is efficient and feasible to extract Al<sup>3+</sup> and Fe<sup>3+</sup> with the assistance of CaF<sub>2</sub> and that HF has a catalytic effect in the reaction system. This work provides a reference for the next step of actual production.https://www.mdpi.com/1996-1944/16/2/499coal gangueacid leachingCaF<sub>2</sub>extraction of aluminum and iron ions |
| spellingShingle | Deshun Kong Zihan Zhou Shuojiang Song Rongli Jiang Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process Optimization Materials coal gangue acid leaching CaF<sub>2</sub> extraction of aluminum and iron ions |
| title | Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process Optimization |
| title_full | Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process Optimization |
| title_fullStr | Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process Optimization |
| title_full_unstemmed | Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process Optimization |
| title_short | Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF<sub>2</sub> Assistance and Process Optimization |
| title_sort | acid leaching extraction mechanism of aluminum and iron ions from coal gangue based on caf sub 2 sub assistance and process optimization |
| topic | coal gangue acid leaching CaF<sub>2</sub> extraction of aluminum and iron ions |
| url | https://www.mdpi.com/1996-1944/16/2/499 |
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