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Preparation of WDXRF analysis cement tablets
Kozlová, Romana ; Lerch, Jiří (referee) ; Svěrák, Tomáš (advisor)
This bachelor's thesis is focused on the sample preparation for the X-ray fluorescent analysis (XRF) of cement. The thesis aims to contribute to finding optimal method of the sample preparation of cement in the form of tablets, which would then provide the most accurate XRF analysis. This activity is related with finding a method of the sample preparation with an appropriate granulometry and homogeneity of the powder material, and also is related with creating the conditions of pressing of this material in the form of compact tablets, which are not prone to fracture. Selected problem was solved by adjusting twenty possible parameters of the mill and press. The milling was evaluated by granulometric composition of the sample, which was determined by a laser diffraction. For the smallest sample the repeatability of measurement was performed. Sieve distribution was used to achieve a finer sample, followed by XRF analysis. Tests of strength of samples pressed into ringlets were performed using a three-point tensile strength in bending, for samples with the finest and most coarse composition. The chemical composition of the finest and most coarse sample, which was prepared by milling and also the sample after milling and sieve distribution, was verified with the XRF analysis. By combining the 20 parameters during the sample preparation, maximum accuracy of the XRF analysis was achieved. The final setting meet the granulometric requirements and also abrasive and strength tests of tablets after pressing the sample. The contribution of this work is an increase in accuracy of the XRF analysis to a better level than ever before. As a result the negative impacts, which directly affect he accuracy and reproducibility of the sample preparation for the XRF analysis, were minimized. The resulting sample preparation was applied to the laboratory of quality and quality control at Českomoravský cement a.s., Mokrá plant, for which this work has been performed.
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Preparation of WDXRF analysis cement tablets
Kozlová, Romana ; Lerch, Jiří (referee) ; Svěrák, Tomáš (advisor)
This bachelor's thesis is focused on the sample preparation for the X-ray fluorescent analysis (XRF) of cement. The thesis aims to contribute to finding optimal method of the sample preparation of cement in the form of tablets, which would then provide the most accurate XRF analysis. This activity is related with finding a method of the sample preparation with an appropriate granulometry and homogeneity of the powder material, and also is related with creating the conditions of pressing of this material in the form of compact tablets, which are not prone to fracture. Selected problem was solved by adjusting twenty possible parameters of the mill and press. The milling was evaluated by granulometric composition of the sample, which was determined by a laser diffraction. For the smallest sample the repeatability of measurement was performed. Sieve distribution was used to achieve a finer sample, followed by XRF analysis. Tests of strength of samples pressed into ringlets were performed using a three-point tensile strength in bending, for samples with the finest and most coarse composition. The chemical composition of the finest and most coarse sample, which was prepared by milling and also the sample after milling and sieve distribution, was verified with the XRF analysis. By combining the 20 parameters during the sample preparation, maximum accuracy of the XRF analysis was achieved. The final setting meet the granulometric requirements and also abrasive and strength tests of tablets after pressing the sample. The contribution of this work is an increase in accuracy of the XRF analysis to a better level than ever before. As a result the negative impacts, which directly affect he accuracy and reproducibility of the sample preparation for the XRF analysis, were minimized. The resulting sample preparation was applied to the laboratory of quality and quality control at Českomoravský cement a.s., Mokrá plant, for which this work has been performed.
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