{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T17:02:58Z","timestamp":1791824578749,"version":"4.3.4"},"reference-count":31,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2024,2,18]],"date-time":"2024-02-18T00:00:00Z","timestamp":1708214400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["51904020"],"award-info":[{"award-number":["51904020"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>A novel process for the synthesis of hydrated silica derived from ferronickel slag (FNS)-leaching residue was proposed in this study. The products of the purification of hydrated silica with 99.68% grade and 95.11% recovery can be obtained through ammonium fluoride (NH4F) roasting, followed by the process of water leaching, ammonia precipitating, and acid cleaning under the optimized conditions. The effects of NH4F mass ratio, roasting temperature, and roasting time on the water-leaching efficiency were investigated in detail. The thermodynamic and X-ray diffraction analyses indicated that the amorphous silica in FNS-leaching residue was converted to water-soluble fluoride salts ((NH4)2SiF6) during the roasting process, which are also supported by the scanning electron microscopy and thermogravimetry analyses. The Si\u2013O bonds in amorphous silica could be effectively broken through the ammonium fluoride activation during a low-temperature roasting process. This work provides a meaningful reference for further studies on the facile synthesis of hydrated silica with similar mineral compositions.<\/jats:p>","DOI":"10.3390\/molecules29040905","type":"journal-article","created":{"date-parts":[[2024,2,21]],"date-time":"2024-02-21T05:42:46Z","timestamp":1708494166000},"page":"905","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue"],"prefix":"10.3390","volume":"29","author":[{"given":"Xuqin","family":"Duan","sequence":"first","affiliation":[{"name":"School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong","family":"Li","sequence":"additional","affiliation":[{"name":"School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanjun","family":"Jiang","sequence":"additional","affiliation":[{"name":"School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,2,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"773","DOI":"10.1016\/j.conbuildmat.2017.09.038","article-title":"Characteristics and reactivity of ferronickel slag powder","volume":"156","author":"Huang","year":"2017","journal-title":"Conster. Build. Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"137633","DOI":"10.1016\/j.jclepro.2023.137633","article-title":"Recycling and comprehensive utilization of ferronickel slag in concrete","volume":"414","author":"Han","year":"2023","journal-title":"J. Clean. Prod."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"108300","DOI":"10.1016\/j.mineng.2023.108300","article-title":"Study on the synergistic mechanism of sulfuric acid and ammonium sulfate on the extraction of metals from ferronickel slag by roasting","volume":"202","author":"Duan","year":"2023","journal-title":"Miner. Eng."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"106202","DOI":"10.1016\/j.cemconres.2020.106202","article-title":"Leaching kinetics and reactivity evaluation of ferronickel slag in alkaline conditions","volume":"137","author":"Cao","year":"2020","journal-title":"Cem. Concr. Res."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"127049","DOI":"10.1016\/j.jclepro.2021.127049","article-title":"Recovery of magnesium from ferronickel slag to prepare hydrated magnesium sulfate by hydrometallurgy method","volume":"303","author":"Gao","year":"2021","journal-title":"J. Clean. Prod."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"188","DOI":"10.1016\/j.conbuildmat.2014.01.038","article-title":"Geopolymer prepared with high-magnesium nickel slag: Characterization of properties and microstructure","volume":"59","author":"Yang","year":"2014","journal-title":"Conster. Build. Mater."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1554","DOI":"10.1016\/j.jnoncrysol.2010.05.063","article-title":"Crystallization behavior of glass ceramics prepared from the mixture of nickel slag, blast furnace slag and quartz sand","volume":"356","author":"Wang","year":"2010","journal-title":"J. Non-Cryst. Solids"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1016\/j.clay.2012.09.018","article-title":"Effect of sulphate and nitrate anions on heavy metal immobilisation in ferronickel slag geopolymers","volume":"73","author":"Komnitsas","year":"2013","journal-title":"Appl. Clay Sci."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"125307","DOI":"10.1016\/j.jclepro.2020.125307","article-title":"A novel utilization of ferronickel slag as a source of magnesium metal and ferroalloy production","volume":"292","author":"Zulhan","year":"2021","journal-title":"J. Clean. Prod."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"521","DOI":"10.1016\/j.resconrec.2019.06.019","article-title":"From ferronickel slag to value-added refractory materials: A microwave sintering strategy","volume":"149","author":"Peng","year":"2019","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"104046","DOI":"10.1016\/j.jobe.2022.104046","article-title":"Microstructure and mechanical properties of activated high-alumina ferronickel slag with carbide slag and alkaline salts","volume":"49","author":"Wang","year":"2022","journal-title":"J. Build. Eng."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"288","DOI":"10.1016\/j.envint.2018.02.045","article-title":"Adverse health effects of ferronickel manufacturing factory on local residents: An interrupted time series analysis","volume":"114","author":"Han","year":"2018","journal-title":"Environ. Int."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"127149","DOI":"10.1016\/j.jclepro.2021.127149","article-title":"Application of ferronickel slag as fine aggregate in recycled aggregate concrete and the effects on transport properties","volume":"304","author":"Bao","year":"2021","journal-title":"J. Clean Prod."},{"key":"ref_14","first-page":"e00727","article-title":"Performance evaluation of cement paste incorporating ferro-nickel slag powder under elevated temperatures","volume":"15","author":"Yang","year":"2021","journal-title":"Case Stud. Constr. Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"120936","DOI":"10.1016\/j.jhazmat.2019.120936","article-title":"Study on the durability of concrete with FNS fine aggregate","volume":"381","author":"Liu","year":"2020","journal-title":"J. Hazard. Mater."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1016\/j.powtec.2019.05.072","article-title":"Multi-scale characterization of precipitated silica","volume":"354","author":"Meier","year":"2019","journal-title":"Powder Technol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.colsurfa.2004.03.021","article-title":"Synthesis and characterization of nanosilica prepared by precipitation method","volume":"240","author":"Jal","year":"2004","journal-title":"Colloids Surf. A Physicochem. Eng. Asp."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"593","DOI":"10.1016\/j.polymertesting.2012.03.003","article-title":"Fumed and precipitated silica reinforced natural rubber composites prepared from latex system: Mechanical and dynamic properties","volume":"31","author":"Prasertsri","year":"2012","journal-title":"Polym. Test."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"497","DOI":"10.1016\/j.powtec.2011.11.009","article-title":"A recyclable method for production of pure silica from rice hull ash","volume":"217","author":"Ma","year":"2012","journal-title":"Powder Technol."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"955","DOI":"10.1016\/j.apsusc.2011.09.035","article-title":"Effect of drying technique on the physicochemical properties of sodium silicate-based mesoporous precipitated silica","volume":"258","author":"Sarawade","year":"2011","journal-title":"Appl. Surf. Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1016\/S0022-3093(00)00299-4","article-title":"Comparison of the techniques used to modify amorphous hydrated silicas","volume":"277","author":"Jesionowski","year":"2000","journal-title":"J. Non-Cryst. Solids"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1016\/j.jhazmat.2019.04.002","article-title":"Selective recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching","volume":"374","author":"Gu","year":"2019","journal-title":"J. Hazard. Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"141197","DOI":"10.1016\/j.cej.2022.141197","article-title":"Extraction of valuable metals from minerals and industrial solid wastes via the ammonium sulfate roasting process: A systematic review","volume":"457","author":"Ju","year":"2023","journal-title":"Chem. Eng. J."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"348","DOI":"10.1016\/j.hydromet.2017.12.020","article-title":"Pressure leaching of manganotantalite by sulfuric acid using ammonium fluoride as an assistant reagent","volume":"175","author":"Yang","year":"2018","journal-title":"Hydrometallurgy"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"200","DOI":"10.1007\/s11148-020-00456-6","article-title":"Phase Formation Processes in Natural Magnesium Silicates of Various Structures by Ammonium Fluoride Treatment","volume":"61","author":"Sharafeev","year":"2020","journal-title":"Refract. Ind. Ceram."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"119757","DOI":"10.1016\/j.seppur.2021.119757","article-title":"Extraction of lithium from coal fly ash by low-temperature ammonium fluoride activation-assisted leaching","volume":"279","author":"Xu","year":"2021","journal-title":"Sep. Purif. Technol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"132703","DOI":"10.1016\/j.cej.2021.132703","article-title":"A promising regeneration of waste carbon residue from spent Lithium-ion batteries via low-temperature fluorination roasting and water leaching","volume":"430","author":"Zhu","year":"2022","journal-title":"Chem. Eng. J."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"123491","DOI":"10.1016\/j.jhazmat.2020.123491","article-title":"A promising selective recovery process of valuable metals from spent lithium ion batteries via reduction roasting and ammonia leaching","volume":"402","author":"Ma","year":"2021","journal-title":"J. Hazard. Mater."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1016\/0022-3093(95)00095-X","article-title":"Amorphous silica studied by high energy X-ray diffraction","volume":"188","author":"Poulsen","year":"1995","journal-title":"J. Non-Cryst. Solids"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1067","DOI":"10.1016\/j.jfluchem.2011.06.003","article-title":"Elaboration of nanometric amorphous silica from quartz-based minerals using the fluorination method","volume":"132","author":"Demyanova","year":"2011","journal-title":"J. Fluor. Chem."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"766","DOI":"10.1134\/S0040579513040209","article-title":"Influence of activation of quartz grain surface on efficiency of the process of processing the quartz sand grains with fluoride technology","volume":"47","author":"Demyanova","year":"2013","journal-title":"Theor. Found. Chem. Eng."}],"container-title":["Molecules"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1420-3049\/29\/4\/905\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:01:49Z","timestamp":1760104909000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1420-3049\/29\/4\/905"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,2,18]]},"references-count":31,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2024,2]]}},"alternative-id":["molecules29040905"],"URL":"https:\/\/doi.org\/10.3390\/molecules29040905","relation":{},"ISSN":["1420-3049"],"issn-type":[{"value":"1420-3049","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,2,18]]}}}