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KMID : 0385520070200060516
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Analytical Science & Technology
2007 Volume.20 No. 6 p.516 ~ p.523
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Impurity analysis and acid leaching purification of silica minerals
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Lee Kil-Yong
Yoon Yoon-Yeol
Cho Soo-Young
Chae Young-Bae
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Abstract
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Purification of silica mineral has been investigated by acid leaching of pulverized silica. A series of studies has been carried out on the effect of leaching silica powder as a function of the leaching time at the constant temperature of 80℃ in oxalic acid, aqua regia, and two mixed acids of HF/HCl, HF/HNO₃. The impurities of silica and leachantes were measured by neutron activation analysis (NAA), inductively coupled plasma atomic emission spectrometry (ICP-AES), atomic absorption spectrometry, xray fluorescence (XRF) method and wet analysis (WA). Certain metals, such as sodium, calcium, iron, aluminium and titanium, have been found in concentrations of hundreds or even thousands of ㎎/㎏. Comparison of purification processes of silica and analytical methods of impurities in the silica was conducted in this study.
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KEYWORD
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Silica, Purification, Acid leaching, Analysis, Impuroty
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