Estimating Grain Size and pH Effects on Steel Slag Dissolution Mechanisms

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  • Nakamura Kengo
    Kyoto University, Graduate School of Engineering, Department of Urban and Environmental Engineering
  • Yoneda Minoru
    Kyoto University, Graduate School of Engineering, Department of Urban and Environmental Engineering

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  • 製鋼スラグからの成分溶出に対する粒径およびpHの影響
  • セイコウ スラグ カラ ノ セイブン ヨウシュツ ニ タイスル リュウケイ オヨビ pH ノ エイキョウ

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Abstract

Steel slag produced by fluoric dissolution trends was examined in this study according to pH and temperature changes of the solvent. Steel slag dissolution amounts depending on grain size were examined under identical conditions. Results of dissolution test, it was suggested that the solvent pH affected the fluorine dissolution amount. Small grain sample showed the difference between estimated and measured data increased. The differences in grain sizes of 0-45 μm, became 100-1000 times on dissolution concentration. Compared with uniformity estimated and the measured data, sample sizes of 1.625-2 mm and 0.425-0.5 mm showed 0.1-10 times difference for each element. Sample sizes of 0-45 μm showed dissolution rates became 1/1000-1/10000 by produced gels. Results imply that the 0-45 μm sample size did not contribute to the dissolution amount, and suggest that 1%-0.1% of surface components are affected by the steel slag dissolution.

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