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Recovery of high specific area silica and sodium fluoride from sodium hexafluorosilicate

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Abstract

Sodium fluoride and high specific area silica were synthesized by using sodium hexafluorosilicate (Na2SiF6) and sodium carbonate decahydrate (Na2CO3·10H2O). The influencing factors of react temperature, contact time, sodium dodecyl sulfate (SDS) and molar ratio of Na2SiF6 to Na2CO3·10H2O were investigated. The optimum process involves the reaction of 0.075 mol Na2SiF6 and 150 mL, 0.225 mol Na2CO3·10H2O (molar ratio of 1:3) at 85 °C for 90 min, and 2.0×10−3 mol sodium dodecyl sulfate (SDS) as additive. The results show that the purities of SiO2 and NaF at extraction yields of 96.5% and 98.0% are 91.0% and 98.6%, respectively. The obtained SiO2 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared ray (FTIR), differential scanning calorimetry and thermogravimetric analysis (DSC-TGA), N2 absorption/desorption (BET) and laser particle size analyzer. The result demonstrates that SiO2 particles have a high BET surface area of 103 m2/g, and a mean grain size of 985 nm.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Hui Xu  (徐徽), Gui Li  (李贵), Jun-feng Cheng  (程俊峰) & Wei-ping Liu  (刘卫平)

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  1. Hui Xu  (徐徽)
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  2. Gui Li  (李贵)
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  3. Jun-feng Cheng  (程俊峰)
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  4. Wei-ping Liu  (刘卫平)
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Correspondence to Hui Xu  (徐徽).

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Xu, H., Li, G., Cheng, Jf. et al. Recovery of high specific area silica and sodium fluoride from sodium hexafluorosilicate. J. Cent. South Univ. 21, 4084–4090 (2014). https://doi.org/10.1007/s11771-014-2401-x

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  • DOI: https://doi.org/10.1007/s11771-014-2401-x

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