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ANALYSIS OF MAJOR AND MINOR ELEMENTS IN CEMENT PRESSED POWDERS

Malvern Panalytical의 'ANALYSIS OF MAJOR AND MINOR ELEMENTS IN CEMENT PRESSED POWDERS'에 관한 응용자료의 주요 내용은 다음과 같다.

Introduction
This application note shows that the Epsilon 4 - a high-performance energy dispersive X-ray fluorescence spectrometer - is capable of analyzing major and minor elements in cement samples.

Application background
X-ray fluorescence spectrometry is used extensively for the analysis of cements and associated raw materials. Simple sample preparation, high accuracy and precision are the main reasons for this choice. Accurate cement analysis is important for many reasons, for example, superior process control with associated cost savings; minimizing and controlling contamination and environmental pollution during cement manufacture; quality control of products; and pure research. To show the capabilities of the Epsilon 4, major and minor elements in cement pressed powders were measured and the results are shown in this application note.

Instrumentation
Measurements were performed using an Epsilon 4 EDXRF spectrometer, equipped with a 10W, 50kV silver anode X-ray
tube, 6 filters, a helium purge facility, a high-resolution silicon drift detector, a spinner and a 10-position removable sample changer.

Sample preparation
The samples were prepared by grinding 5g cement material with 0.5g of binder(wax). After grinding, the mixture was pressed into a pellet of 32mm diameter(20 tons, 30 s dwelling time).

Measurement procedure
Eleven cement standards from China were used to set up a calibration for nine major oxides(Ca, Si, Al, Fe, S, Mg, K, Ti, and Na). Two different measurement conditions were used, each one optimizing the excitation of a group of elements(Table 1).

Table 1. Measurement conditions

Figure 1. XRF spectrum of a NIST cement pressed powder showing the excellent sensitivity and resolution of the detector, resulting in fully separated Na, Mg, Al and Si peaks

Figure 2. Calibration plot of MgO in cement pressed powder


Accurate calibration results
Figure 2 shows a calibration plots for MgO in cement pressed pellets. This plot shows a good correlation between the certified concentrations and the calculated concentrations. Detailed results for MgO and the other compounds are listed in Table 2.

Table 2. Calibration results

Precision
To test the analytical precision of the instrument, one cement sample was measured 10 times consecutively, using the conditions given in Table 1. The certified concentration, average concentration, and the RMS(1 sigma standard deviation) are expressed in Table 3.

Table 3. Results of the repeatability test

Conclusions
The results clearly demonstrate that the Epsilon 4 EDXRF spectrometer is suitable for the analysis of major and minor compounds in cement. Accurate, reliable and repeatable results are obtained in 3 minutes measuring time per sample.

Malvern Panalytical의 'XRF Epsilon 4'에 대한 상세한 내용은 Reference(참고자료)를 통하여 확인할 수 있다.

Reference(참고자료): 말번 파날리티칼 응용노트

Model Name(모델명): XRF Epsilon 4
The Person in Charge(담당자): Kim Seungji
Maker(제조사): Malvern Panalytical
Country of Origin(원산지): Netherlands
Mail inquiry: korea.info@malvernpanalytical.com
Data Services(자료제공): Malvern Panalytical Korea

<이 기사는 사이언스21 매거진 2023년 3월호에 게재 되었습니다.>

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