Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
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Volume 42, Issue 9
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  • Development of Detoxifying Treatment and Regeneration Process of HFC-134a by Waste Materials
    Hideki YAMAMOTO, Sadao ARAKI, Hajime INOUE, Yukio HAYASHI , Kei MATSUB ...
    2013 Volume 42 Issue 9 Pages 548-552
    Published: September 20, 2013
    Released on J-STAGE: September 30, 2013
    DOIhttps://doi.org/10.5956/jriet.42.548
    JOURNAL FREE ACCESS
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    This study proposed a new regeneration process of high-purity fluorite from C2H2F4（HFC-134a） using chemical reaction with calcium compounds. Residual dross which is consisted of Ca（OH2） and CaCO3 in the manufacturing process of CaCO3 was used as the reactant with HFC-134a. The HFC-134a decomposition showed high value more than 99.9％by using Residual dross. The calcium dross after reaction contained fluorite of 20.1％ and solid carbon. We try to purify the fluorite by calcination and dissolution/reprecipitation using HF-HCl waste acid. Then the calcium dross was dissolved in the waste acid, and the precipitation was recovered. This precipitation showed only peaks of fluorite without peaks of other calcium compounds. XRF measurement indicated the puerility of this sample is about 97 wt％. The recovery of fluorine in waste acid was 98.6％.
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