フッ化水素酸によるアスベストの化学的分解 [in Japanese] Degradation of Asbestos by Hydrofluoric Acid [in Japanese]
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Asbestos fiber crystals were efficiently degraded by hydrofluoric acid, but not hydrochloric acid, sulfuric acid and nitric acid. Asbestos fiber crystals were completely degraded by 15% hydrofluoric acid within 2 hours at room temperature. The results of TEM micrographs, corresponding selected area diffraction patterns (SADP) and X-ray diffraction measurements obviously demonstrated that asbestos fiber crystals were reacted with hydrofluoric acid to generate magnesium fluoride and magnesium hexafluorosilicate. A high concentration of hydrofluoric acid remained in a wastewater after treatment of asbestos with 15% hydrofluoric acid for 2 hours was properly processed. After having processed the wastewater, the concentration of fluorine ion was 1.8 mg/<I>l</I>. These results suggest that the method consisting of a degradation of asbestos with hydrofluoric acid and a subsequent processing of wastewater may be useful for removing resolution of asbestos.
Eco-Engineering 20(2), 79-84, 2008-04-30
The Society of Eco-Engineering