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

Khunur, Mohammad Misbah and Risdianto, Andri and Mutrofin, Siti and Prananto, Yuniar Ponco (2012) Synthesis of Fluorite (CaF2) Crystal from Gypsum Waste of Phosphoric Acid Factory in Silica Gel. BULLETIN OF CHEMICAL REACTION ENGINEERING & CATALYSIS, 7 (1). pp. 71-77. ISSN 1978-2993

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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 BCREC UNDIP. All rights reserved

Item Type:Article
Uncontrolled Keywords:minerals; calcium; by-product; gel method; supernatant
Subjects:T Technology > TP Chemical technology
Q Science > QD Chemistry
Divisions:UNDIP Journal > Bulletin of Chemical Reaction Engineering and Catalysis
Faculty of Engineering > Department of Chemical Engineering
Faculty of Engineering > Department of Chemical Engineering
ID Code:35721
Deposited By:Dr. Istadi Istadi
Deposited On:11 Jul 2012 15:04
Last Modified:11 Jul 2012 15:04

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