Abstract：Magnesium powder plays an important role in the industrial application of magnesium. Its effective constituent is active magnesium. The current standard method for determination of active magnesium content in China is the gas volume method. However, the environmental requirements of measurement in this method are high. The airtightness of reaction device should be excellent. Moreover, the measurement procedures are complicated and hardly operated. A new chemical reaction device for the determination of active magnesium in magnesium powder was designed based on the law of conservation of mass. A new method for the determination of active magnesium was established based on the structure and working principle of this device. The effect of water vapor and volatile hydrogen chloride gas generated in reaction process on the measurement result was comprehensively considered in the method. In addition, the influence was effectively eliminated through the water absorption of alkali lime and the neutralization reaction with acid. The proposed method was applicable for the determination of active magnesium in magnesium powder with mass fraction not less than 92%. The content of active magnesium in magnesium powder sample was determined according to the experimental method. The relative standard deviations (RSD, n=12) of determination results were between 0.060% and 0.084%. The proposed method was applied to determine active magnesium in two magnesium particles, and the found results were basically consistent with the reference values. The measurement error was smaller than the allowable difference specified in the standard of YS/T 617.1-2007.
孙志阳, 钱亚锋, 李伟杰. 一种测定镁粉中活性镁含量的新装置及其应用[J]. 冶金分析, 2020, 40(2): 36-40.
SUN Zhi-yang, QIAN Ya-feng, LI Wei-jie. A new device for determination of active magnesium content inmagnesium powder and its application. , 2020, 40(2): 36-40.
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