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| Optimization and Mechanism Analysis of Impurity Removal Process of Fluorine-Containing Sludge |
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Received:May 18, 2023
Revised:June 04, 2023
Accepted:June 05, 2023
Published Online:August 11, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.09.018 |
| KeyWord:fluorine-containing sludge; calcium fluoride; multiple disposal; impurity removal process |
| Author | Institution |
| JI Dongliang |
江苏开放大学环境生态学院 |
| LANG Yudong |
生态环境部南京环境科学研究所 |
| DING Ying |
南京晓庄学院环境科学学院 |
| ZHAO Zehua |
生态环境部南京环境科学研究所 |
| HUANG Zhaoqin |
江苏开放大学环境生态学院 |
| PANG Shulei |
南京晓庄学院环境科学学院 |
| CHENG Junhua |
杭州乾智新材料研究院 |
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| Abstract: |
| A large number of fluorine-containing sludge generated by photovoltaic power generation industry contains high content of calcium fluoride, which can be used as a resource recycling to realize the reduction, harmless and resource utilization of fluorine-containing sludge. The fluorine-containing sludge was used as raw materials for impurity removal treatment, and the influence of multiple disposals on impurity removal was explored. Based on the moisture content, morphology observation, chemical composition and structure analysis and sedimentation performance test results of fluorine-containing sludge, the technical route of resource utilization of calcium fluoride sludge was optimized. The results show that compared with the two-step and three-step combined treatment, the four-step combined treatment of salinization, acidification, fluorination and alkalization can remove silicon, calcium and heavy metals in non calcium fluoride form more effectively. The mass fraction of calcium fluoride in the fluoride sludge treated by four-step process can reach 85%, and the final yield can reach 72.53%. |
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