Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditions
Pyro-metallurgical copper slag (CS) waste was used as the source material for ultrasound (US) silica extraction under acidification processes with 26 kHz with HCl, HNO3, and H2SO4 at different concentrations at 100, 300, and 600 W. During acidifying extraction processes, US irradiation inhibited sil...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Ultrasonics Sonochemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417723001591 |
| _version_ | 1797801752557256704 |
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| author | Phan Phuoc Tri Kobayashi Takaomi Uchida Syuji |
| author_facet | Phan Phuoc Tri Kobayashi Takaomi Uchida Syuji |
| author_sort | Phan Phuoc Tri |
| collection | DOAJ |
| description | Pyro-metallurgical copper slag (CS) waste was used as the source material for ultrasound (US) silica extraction under acidification processes with 26 kHz with HCl, HNO3, and H2SO4 at different concentrations at 100, 300, and 600 W. During acidifying extraction processes, US irradiation inhibited silica gel formation under acidic conditions, especially at lower acid concentrations of less than 6 M, whereas a lack of US irradiation led to enhanced gelation. When US stopped, gelation occurred to a considerable degree, suggesting that the gel particle size distribution was aggregated in the 3–400 µm size range. However, with US, the size was mainly in the 1–10 µm range. Results of elemental analysis indicated that US treatment decreased the co-precipitation of other metal ions such as Fe, Cu, and Al sourced from CS for lower acidic medium, whereas the higher concentration medium accelerated silica gelation and the co-precipitation of other metals. With acids of HCl and HNO3, and H2SO4, the gelations were less likely to occur at 6 M and 3 M during US irradiation, but acidic extraction without US was efficient for silica gelation and co-precipitation of other metals in the purified silica. The silica extraction yield with H2SO4 concentration of 3 M was 80% with 0.04% of Fe, whereas the silica product from HCl 6 M had a 90% extraction yield with only 0.08% of Fe impurity. In contrast, even though the non-US system of HCl 6 M had a higher yield at 96%, the final product had 0.5% Fe impurity, which was much higher than the US system. Consequently, the US extraction process was quite noticeable for silica recovery from CS waste. |
| first_indexed | 2024-03-13T04:55:16Z |
| format | Article |
| id | doaj.art-18f039113c7c43eaac11e2509ceaa6d8 |
| institution | Directory Open Access Journal |
| issn | 1350-4177 |
| language | English |
| last_indexed | 2024-03-13T04:55:16Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj.art-18f039113c7c43eaac11e2509ceaa6d82023-06-18T05:01:12ZengElsevierUltrasonics Sonochemistry1350-41772023-07-0197106447Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditionsPhan Phuoc Tri0Kobayashi Takaomi1Uchida Syuji2Department of Innovation Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka Nagaoka, Niigata 940-2188, JapanDepartment of Innovation Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka Nagaoka, Niigata 940-2188, Japan; Corresponding author.Department of Applied Chemistry and Biochemistry, National Institute of Technology-Fukushima College, 30 Nagao Taira Kamiarakawa, Iwaki, Fukushima 970-8034, JapanPyro-metallurgical copper slag (CS) waste was used as the source material for ultrasound (US) silica extraction under acidification processes with 26 kHz with HCl, HNO3, and H2SO4 at different concentrations at 100, 300, and 600 W. During acidifying extraction processes, US irradiation inhibited silica gel formation under acidic conditions, especially at lower acid concentrations of less than 6 M, whereas a lack of US irradiation led to enhanced gelation. When US stopped, gelation occurred to a considerable degree, suggesting that the gel particle size distribution was aggregated in the 3–400 µm size range. However, with US, the size was mainly in the 1–10 µm range. Results of elemental analysis indicated that US treatment decreased the co-precipitation of other metal ions such as Fe, Cu, and Al sourced from CS for lower acidic medium, whereas the higher concentration medium accelerated silica gelation and the co-precipitation of other metals. With acids of HCl and HNO3, and H2SO4, the gelations were less likely to occur at 6 M and 3 M during US irradiation, but acidic extraction without US was efficient for silica gelation and co-precipitation of other metals in the purified silica. The silica extraction yield with H2SO4 concentration of 3 M was 80% with 0.04% of Fe, whereas the silica product from HCl 6 M had a 90% extraction yield with only 0.08% of Fe impurity. In contrast, even though the non-US system of HCl 6 M had a higher yield at 96%, the final product had 0.5% Fe impurity, which was much higher than the US system. Consequently, the US extraction process was quite noticeable for silica recovery from CS waste.http://www.sciencedirect.com/science/article/pii/S1350417723001591Copper slagHigh-power ultrasoundSilica extractionSilica gelation inhibition |
| spellingShingle | Phan Phuoc Tri Kobayashi Takaomi Uchida Syuji Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditions Ultrasonics Sonochemistry Copper slag High-power ultrasound Silica extraction Silica gelation inhibition |
| title | Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditions |
| title_full | Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditions |
| title_fullStr | Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditions |
| title_full_unstemmed | Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditions |
| title_short | Ultrasound effects on restricted silica gelation during silica extraction from Pyro-Metallurgical copper slag under acidifying conditions |
| title_sort | ultrasound effects on restricted silica gelation during silica extraction from pyro metallurgical copper slag under acidifying conditions |
| topic | Copper slag High-power ultrasound Silica extraction Silica gelation inhibition |
| url | http://www.sciencedirect.com/science/article/pii/S1350417723001591 |
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