硼酸衬底压片制样-X射线荧光光谱法测定除尘灰中14种主次量元素

除尘灰中过高含量的钾、钠、锌、氯等元素严重影响转底炉的正常生产和稳定运行，为解决钢铁行业中除尘灰的环保和资源再利用问题，需准确测定其中各组分的含量。除尘灰种类多，钾、钠、锌和氯含量范围宽，采用X射线荧光光谱法（XRF）测定易超出工作曲线测定范围。本文基于粉末直接压片，采用硼酸衬底镶边的方法，将氯化钾、氯化钠和氧化锌基准试剂加入铁矿石标样中制备更高含量的校准样品，扩展了除尘灰日常分析中钾、钠、锌和氯的测定范围，使钾的测定范围为1.36%~12.00%，钠的测定范围为0.43%~6.85%，锌的测定范围为0.24%~35.00%，增加了氯的测定范围为0.25%~10.00%。本方法测定除尘灰中14种主次组分的精密度（RSD，n=7）均小于5.2%，实际样品的测定值与标准方法测定值基本一致，准确度和精密度良好。

Determination of 14 Major and Minor Elements in Dust Ash by X-ray Fluorescence Spectrometry with Powder-Pelleting-Lined Boric Acid Preparation

BACKGROUND: The high content of potassium, sodium, zinc, and chlorine in dust ash significantly affects the stable operation of converter. To recycle the dust ash, it is necessary to accurately determine the contents of the components. Dust ash contains a broad range of potassium, sodium, zinc, and chlorine; therefore, the traditional X-ray fluorescence spectrometry (XRF) exceeds the range of the work curve.OBJECTIVES: To develop a method for the determination of 14 components in the dust ash with a broad concentration range of potassium, sodium, zinc, and chlorine.METHODS: Standard reagents of potassium chloride, sodium chloride, and zinc oxide were added to commercially available iron ore standards in a quantitative manner to provide a new series of calibration samples with wide ranges of potassium, sodium, zinc, and chlorine contents. The 14 components in the dust ash were determined by XRF spectrometry with a powder-pelleting-lined boric acid preparation.RESULTS: The measurement ranges of potassium, sodium, zinc, and chlorine were 1.36%-12.00%, 0.43%-6.85%, 0.24%-35.00%, and 0.25%-10.00%, respectively. The results of the 14 components in the dust ash were consistent with those of the traditional method, yielding a relative standard deviation of <5.2% (n=7).CONCLUSIONS: XRF spectrometry with the powder-pelleting-lined boric acid preparation showed good accuracy and precision during the determination of 14 components in the dust ash.