TY - JOUR
T1 - A method of removing metal ions from silicate glasses for recycling by liquid-phase deposition
AU - Homma, Tetsuya
N1 - Funding Information:
The author would like to thank Dr H. Takahashi and Dr T. Nagatomo for their encouragement. He thanks Dr M. Yamaguchi and Mr H. Kondo for their assistance in measurements. He would also like to express appreciation to Mr T. Tatsuno, Mr T. Kobayashi and Mr M. Miyamoto of Morita Chemical Industries, Co., Ltd. for ICP-MS analysis. This work was supported by The Sumitomo Foundation (No. 003264). This work was also partly supported by the project research fund of the Shibaura Institute of Technology (SIT), and by High-Tech Research Center Project from the Ministry of Education, Culture, Sports, Science and Technology, Government of Japan.
PY - 2001/10
Y1 - 2001/10
N2 - A method of removing metal ions from silicate glasses for recycling was studied. This method utilizes a liquid-phase deposition (LPD) technique using a hydrofluosilicic acid (H2SiF6) aqueous solution supersaturated with silica. Silicate glass powder prepared from a glass bottle was dissolved in aqueous hydrofluoric acid (HF) solution. The fluorinated silicon oxide (SiOF) separated from the H2SiF6, and then an LPD-SiOF gel was formed in the supersaturated H2SiF6 aqueous solution. Almost all ratios of metals to silicon (Si) were reduced by at least one order of magnitude. The LPD-SiOF powder formed by drying the LPD-SiOF gel at 23 °C showed a different chemical bonding structure than that of the initial silicate glass powder. The LPD-SiOF powder showed a cluster structure of spheres 1-2 μm in diameter. A possible mechanism for removal of the non-Si primary component metal oxides and other impurity metal ions is proposed. The features of this method and a possible application for recycled silica are also discussed.
AB - A method of removing metal ions from silicate glasses for recycling was studied. This method utilizes a liquid-phase deposition (LPD) technique using a hydrofluosilicic acid (H2SiF6) aqueous solution supersaturated with silica. Silicate glass powder prepared from a glass bottle was dissolved in aqueous hydrofluoric acid (HF) solution. The fluorinated silicon oxide (SiOF) separated from the H2SiF6, and then an LPD-SiOF gel was formed in the supersaturated H2SiF6 aqueous solution. Almost all ratios of metals to silicon (Si) were reduced by at least one order of magnitude. The LPD-SiOF powder formed by drying the LPD-SiOF gel at 23 °C showed a different chemical bonding structure than that of the initial silicate glass powder. The LPD-SiOF powder showed a cluster structure of spheres 1-2 μm in diameter. A possible mechanism for removal of the non-Si primary component metal oxides and other impurity metal ions is proposed. The features of this method and a possible application for recycled silica are also discussed.
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U2 - 10.1016/S0022-3093(01)00799-2
DO - 10.1016/S0022-3093(01)00799-2
M3 - Article
AN - SCOPUS:0035478313
SN - 0022-3093
VL - 291
SP - 25
EP - 31
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 1-2
ER -