Synthesis of Fluorite (CaF2) Crystal from Gypsum Waste of Phosphoric Acid Factory in Silica Gel

Mohammad Misbah Khunur; Andri Risdianto; Siti Mutrofin; Yuniar Ponco Prananto

doi:10.9767/bcrec.7.1.3171.71-77

DOI: https://doi.org/10.9767/bcrec.7.1.3171.71-77

Synthesis of Fluorite (CaF2) Crystal from Gypsum Waste of Phosphoric Acid Factory in Silica Gel

Mohammad Misbah Khunur, Andri Risdianto, Siti Mutrofin, Yuniar Ponco Prananto

Department of Chemistry, Faculty of Mathematics and Natural Sciences, Brawijaya University, Jl. Veteran 01 Malang, East Java, Indonesia

Received: 11 Apr 2012; Revised: 4 Jun 2012; Accepted: 13 Jun 2012; Published: 20 Jun 2012.

Editor(s): Istadi Istadi

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BibTex Citation Data :

@article{BCREC19591,
    author = {Mohammad Misbah Khunur and Andri Risdianto and Siti Mutrofin and Yuniar Ponco Prananto},
    title = {Synthesis of Fluorite (CaF2) Crystal from Gypsum Waste of Phosphoric Acid Factory in Silica Gel},
    journal = {Bulletin of Chemical Reaction Engineering & Catalysis},
  volume = {7},
    number = {1},
    year = {2012},
    keywords = {minerals; calcium; by-product; gel method; supernatant},
    abstract = { This paper report the synthesis and characterization of fluorite single crystal prepared from gypsum waste of phosphoric acid production in silica gel. Instead of its high calcium, gypsum was used to recycle the waste which was massively produces in the phosphoric acid production. The gypsum waste, the raw material of CaCl2 supernatant, was dissolved in concentrated HCl and then precipitated as calcium oxalate (CaC2O4) by addition of ammonium oxalate. The CaCl2 was obtained by dissolving the CaC2O4 with HCl 3M. The crystals were grown at room temperature in silica gel and characterized by AAS, FTIR and powder XRD. The optimum crystal growth condition, which is pH of gel, CaCl2 concentration and growth time, were investigated. The result shows that at optimum condition of pH 5.80, CaCl2 concentrations of 1.2 M, and growth time of 144 hours, colorless crystals with the longest size of 3 mm, were obtained (72.57%). Characterization of the synthesized crystal by AAS indicates that the obtained crystal has high purity. Meanwhile, analysis by FTIR spectra shows a Ca–F peak at 775 cm-1, and powder-XRD analysis confirms that the obtained crystal was fluorite (CaF2).   © 2012 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (  https://creativecommons.org/licenses/by-sa/4.0  ) },
   issn = {1978-2993},   pages = {71--77}  doi = {10.9767/bcrec.7.1.3171.71-77},
    url = {https://journal.bcrec.id/index.php/bcrec/article/view/19591}
}

Citation Format:

Abstract

This paper report the synthesis and characterization of fluorite single crystal prepared from gypsum waste of phosphoric acid production in silica gel. Instead of its high calcium, gypsum was used to recycle the waste which was massively produces in the phosphoric acid production. The gypsum waste, the raw material of CaCl2 supernatant, was dissolved in concentrated HCl and then precipitated as calcium oxalate (CaC2O4) by addition of ammonium oxalate. The CaCl2 was obtained by dissolving the CaC2O4 with HCl 3M. The crystals were grown at room temperature in silica gel and characterized by AAS, FTIR and powder XRD. The optimum crystal growth condition, which is pH of gel, CaCl2 concentration and growth time, were investigated. The result shows that at optimum condition of pH 5.80, CaCl2 concentrations of 1.2 M, and growth time of 144 hours, colorless crystals with the longest size of 3 mm, were obtained (72.57%). Characterization of the synthesized crystal by AAS indicates that the obtained crystal has high purity. Meanwhile, analysis by FTIR spectra shows a Ca–F peak at 775 cm-1, and powder-XRD analysis confirms that the obtained crystal was fluorite (CaF2). © 2012 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)

Keywords: minerals; calcium; by-product; gel method; supernatant

Funding: Faculty of Mathematics and Natural Sciences, Brawijaya University

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Section: Original Research Articles

Language : EN

In 2012: BCREC Volume 7 Issue 1 Year 2012 (June 2012)

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