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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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Possibilities of utilization of fly ash from SNCR technology in the production of Portland cement
Kozlová, Romana ; Šoukal, František (referee) ; Opravil, Tomáš (advisor)
The Master thesis deals with utilization possibilities of fly ash after selective non-catalytic reduction (SNCR) process for Portland cement preparation as a correction component to the raw material with regard to contaminated fly ash by ammonium sulphate or ammonium hydrogensulfate that is one of the products from SNCR process. Presented thesis was focused on behaviour of raw meal with ammonia hydrogensulfate contaminated fly ash after SNCR during burning of Portland clinker in simulated kiln conditions. The thesis deals with Portland clinker preparation from this kind of raw mix and it studies mainly clinker quality, clinker phases and structure. Quantitative phase composition of prepared samples of clinker was performed by optical microscopy measurements using point counting method and XRD analysis (Rietveld method). Hydration heat flow of prepared clinker was measured by Isothermal Calorimetry. TG-DTA analysis of prepared raw meal was studied due to better comparison of prepared samples and better understanding of processes during burning process.
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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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