Removing fluorine and chlorine from zinc oxide dust by wet alkaline washing and studying fluorine occurrence states
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Xixi Wang
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Xingbin Li
Abstract
When zinc hydrometallurgy is used to treat zinc oxide dust (ZOD), the fluorine (F) and chlorine (Cl) in the dust interfere with zinc electrowinning. To investigate the effectiveness of F and Cl removal from ZOD by different alkaline washing methods. Under the condition that 16 g/L Na2CO3 was mixed with 6 g/L NaOH in equal volume 1:1 and reacted with the dust under the optimum condition of the liquid-solid ratio of 5 mL/g for 2 h at 70 °C, final pH of 10, and stirring intensity of 400 rpm, the dechlorination of cloth bag zinc oxide dust (CBZOD) and boiler zinc oxide dust (BZOD) were 94.81 % and 90.63 %, respectively, and the defluorination were 84.81 % and 24.50 %, respectively. To further reveal the reasons for the difficult removal of F from ZOD, a step extraction method and physical phase analysis of residue were used, which resulted in more than 98 % removable fluoride in CBZOD and up to 56 % insoluble residue in BZOD. Therefore, it is obvious that the removal effect is better due to the presence of large amounts of removable fluoride and chloride in CBZOD; the F states and percentage of insoluble fluoride are main reasons affecting the removal of F.
Funding source: Yunnan Major Scientific and Technological Projects
Award Identifier / Grant number: 202202AG050008
Award Identifier / Grant number: 202302AB080012
Funding source: Science and Technology Talent Programme of Yunnan
Award Identifier / Grant number: 202405AC350015
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: Xixi Wang and Zhigan Deng designed the experiments and prepared the manuscript with contributions from all co-authors. Jiahui Li carried experiments and data processing out. Chang Wei designed the experiment procedure. Xingbin Li and Mingting Li conducted the samples analysis. The sequence of authors were determined on their contribution. The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: This research was financially supported by the Science and Technology Talent Programme of Yunnan (Grant Nos. 202405AC350015) and Yunnan Major Scientific and Technological Projects in China (Grant Nos. 202202AG050008, 202302AB080012).
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Data availability: The raw data can be obtained on request from the corresponding author.
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Articles in the same Issue
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Articles in the same Issue
- Frontmatter
- Articles
- Kinetics and thermodynamics of methylene blue adsorption onto black plum seed-based graphene oxide
- Preparation of high-activity mineral powder from coal gangue through thermal and chemical activation
- Electrical performance of calcium ferrite in sintering by the assimilation melt breakover method
- Production of biodiesel from hemp oil and oleic acid with sulfonated camphor catalysts is to be evaluated with controlled tests in a diesel engine
- Removing fluorine and chlorine from zinc oxide dust by wet alkaline washing and studying fluorine occurrence states
- Epoxidation of sunflower oil via in situ generated hybrid peracids mechanism
- Oxidative conversion of lignin into monophenolic compound catalyzed by NaOH–NaAlO2/γ-Al2O3 under mild conditions
- Dynamic modeling and optimization of methanol partial oxidation to formaldehyde over Mo–Fe catalyst in an industrial isothermal reactor
- Testing of kaolinite/TiO2 nanocomposites for methylene blue removal: photodegradation and mechanism
- Investigation of gas-liquid flow hydrodynamics in the industrial-scale stirred tank with inclined impeller
