論説
スラグ中ふっ素分析方法の開発
2007 年 78 巻 1 号 p. 5-11
詳細
2007 年 78 巻 1 号 p. 5-11
Fluorite is added to steelmaking slag to improve fluidity and desulfurization reaction. Leaching of fluorine to soil, however, is regulated by notification of environmental ministry and is the tasks to be settlement in slag recycle. It is necessary to know a quantity of fluorine in slag correctly in order to solve above problem. Therefore, rapid analysis method of accurate fluorine quantity in slag is developed. This analysis method is extracts fluorine from slag by pyrohydrolysis, and to measure the fluorine with ion chromatograph. Addition of tungsten trioxide as reaction accelerator and heated at 1100 ℃ for over ten minutes as the pyrohydrolysis condition which completely extracted fluorine is adopted in this method. Quantity of fluorine analysis method has developed and shows good accuracy and compatible with good efficiency. It is revealed from the fact that this analysis method could analyze a quantity of fluorine with twenty samples automatically and the accuracy was about 2 % relative standard deviation.
