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231226s2024 xx |||||o 00| ||eng c |
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|a 10.1016/j.wasman.2023.11.026
|2 doi
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|a (PII)S0956-053X(23)00715-8
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|a eng
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| 100 |
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|a Li, Cong
|e verfasserin
|4 aut
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|a Preparation of high-purity SiO2 by S-HGMS coupled with mixed-acid leaching
|b A case study on hematite tailings from Ansteel, China
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 16.01.2024
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|a Date Revised 16.01.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2023 Elsevier Ltd. All rights reserved.
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|a Hematite tailings (HTs) are rich in silica and are used as replacements for fine aggregates in the preparation of construction materials. However, there is scope for a more effective utilization of the valuable elements present in HTs. In this paper, a process for preparing high-purity SiO2 using HTs procured from Ansteel (China) is proposed. HTs were treated using the superconducting high-gradient magnetic separation (S-HGMS) technology, where the silica as part of the nonmagnetic fraction was obtained in the form of a high-silica concentrate, which was then subjected to mixed-acid leaching to dissolve impurities to achieve refined purification. The optimum process conditions for S-HGMS were determined, and the response surface methodology was applied to optimize the process parameters of the mixed-acid leaching process. The process indicators of the mixed-acid leaching step included the leaching time, leaching temperature, and molar ratio of the mixed acids. The optimum process conditions for S-HGMS were as follows: the magnetic strength-to-velocity ratio in the weak magnetic separation stage was set to 0.034 T·s/m whereas it was maintained at 0.076 T·s/m in the strong magnetic separation stage; the pulp concentration was 40 g/L, the pulp velocity was 500 mL/min, and the dispersant concentration was 1 mg/g. Under these conditions, the high-silica pulp was processed. The corresponding SiO2 grade increased from 71.788 % to 95.260 %, and its recovery and yield reached 56.330 % and 42.450 %, respectively. The SiO2 content in the sample increased from 95.260 % to 99.961 %. Further, the mechanisms of the S-HGMS and mixed-acid leaching were revealed. The proposed process is environmentally friendly and operationally inexpensive. It can reduce the amount of HTs by 42.450 %, and the obtained high-purity silica product has high economic value and good industrialization prospects
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|a Journal Article
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|a Hematite tailings
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|a High-purity SiO(2)
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|a Industrial solid waste
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|a Mixed-acid leaching
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|a S-HGMS
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|a Silicon Dioxide
|2 NLM
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|a 7631-86-9
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|a ferric oxide
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|a Ferric Compounds
|2 NLM
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|a Yang, Xiaofeng
|e verfasserin
|4 aut
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|a Li, Yongkui
|e verfasserin
|4 aut
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|a Chen, Yu
|e verfasserin
|4 aut
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|a Pan, Xiaodong
|e verfasserin
|4 aut
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|a Xie, Yongping
|e verfasserin
|4 aut
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|a Liu, Xingyu
|e verfasserin
|4 aut
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|a Li, Suqin
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Waste management (New York, N.Y.)
|d 1999
|g 174(2024) vom: 15. Feb., Seite 240-250
|w (DE-627)NLM098197061
|x 1879-2456
|7 nnas
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|g volume:174
|g year:2024
|g day:15
|g month:02
|g pages:240-250
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|u http://dx.doi.org/10.1016/j.wasman.2023.11.026
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