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Received January 20, 2010
Accepted March 7, 2010
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Preparation of high purity nano silica particles from blast-furnace slag
Department of Nano Science and Technology, Sejong University, Seoul 143-747, Korea 1Department of Civil & Environmental Engineering, Chonnam National University, Jeonnam 550-749, Korea 2Department of Environmental Engineering, Sunchon National University, Jeonnam 540-742, Korea
jsc@sunchon.ac.kr
Korean Journal of Chemical Engineering, November 2010, 27(6), 1901-1905(5), 10.1007/s11814-010-0289-1
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Abstract
High purity nano silica was synthesized using acid treatment and surface modification from blast-furnace slag generated in the steel industry. Blast-furnace slag was treated with nitric acid to extract high-purity insoluble silica. Nano silica was then produced using filtration and surface modified by cation surfactant- Cetyltrimethyl Ammonium Bromide (CTAB). The Zeta potential of silica was tested under various alkaline conditions. Synthesized silica remained electronegative throughout the pH range tested and the number of hydroxyl groups existing on the silica surface was highest when the pH was 9. The size of silica particles was smallest when the modification temperature was 60 ℃. The average size of silica particles modified with 3 wt% CTAB was 107.89 nm, while the average size of unmodified silica was 240.38 nm. After extracting silica, pH of the remaining solution was adjusted by adding CaO and then highpurity calcium nitrate crystals were extracted using solubility difference. It was found experimentally that enriching the solution to a high specific gravity (1.63-1.65) before crystallization is preferable for efficient calcium nitrate recovery.
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