ソーダ石灰ガラスを用いた有害重金属イオンの固定 : 廃棄物ガラス中の鉄と亜鉛のキャラクタリゼーション

概要

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X-ray spectrometry and X-ray diffraction (XRD) studies indicate that yellow sludge containing hydroxides of several hazardous heavy metal ions, i.e., Cr, Fe, Cu, Zn and Pb, has an amorphous structure. The XRD and ^<57>Fe Mossbauer studies of the yellow sludge indicate the formation of a small amount of γ-FeOOH particles. Heavy metal waste glass of a light green color could be prepared by melting the yellow sludge together with synthetic soda-lime silicate glass of a light brown color. Additional waste glass could be prepared from a glass bottle for commercial drinks. Leaching test for Zn and Fe with the acid rain simulant (pH 3.5), which was prepared from a nearly equal amount of HNO_3 (pH 3.5) and H_2SO_4 solution (pH 3.5), proved that the waste glass has higher chemical durability than the sludge adsorbed on "diatomaceous earth." These results indicate that soda-lime silicate glass is a very effective medium for stable solidification of heavy metal ions, and that the "glass wastes" can be reused for this purpose.
社団法人日本セラミックス協会の論文
2000-03-01