In this study, the influence of fluorspar addition on the clinkering process is examined. The per... more In this study, the influence of fluorspar addition on the clinkering process is examined. The percentages of fluorspar added to the raw material vary from (0.25 % to 1% by steps of 0.25 %). It is added to the raw meal to prepare 9 g of a homogeneous mixture. Clinkers were synthesized in a kiln type Nabertherm. The temperatures of cooking varied between 1300 and 1450°C. The basis of assessment of raw materials was the estimation of free lime and C3S content. The burnability behavior of clinkers produced was investigated by Optical Microscopy (MO). The experimental results can show that the addition of small amounts of fluorspar (0.75 %) to cement raw material accelerates the formation of alite (C3S) phase and intensifies the process of the free lime combining during the clinkerisation. We can also conclude that we can perform a good burnabiliy of raw material at temperature of 1300°C instead of 1450°C. Keywords— raw material; fluorspar; clinkers; alite; free lime; burnabiliy
—The aim of the present research is to improve the manufacturing conditions of cement and therefo... more —The aim of the present research is to improve the manufacturing conditions of cement and therefore its quality. For this purpose, various reference samples of clinker were produced in the normal manufacture's conditions considered by the Company of Cement of Gabes, then compared to other samples which are variable in the Lime Saturation Factor and the raw material's fineness. All the samples are analyzed by X-Ray Fluorescence, X-ray diffraction and optical microscopy including a study of measurement of clinker's crystal sizes. Besides, tests of compressive strength were made after 2, 7 and 28 days. Finally, a study of clinker's grindability enabled us to evaluate the probability of grinding of these samples. In all cases, the best clinker is the one that has a vintage's fineness close to 13-15% for the refusal of 100 µm. This latter gives a well-formed clinker nodules, well homogenized phases and indicating cement's good quality. This clinker presents also the best grindability.
In this study, the influence of fluorspar addition on the clinkering process is examined. The per... more In this study, the influence of fluorspar addition on the clinkering process is examined. The percentages of fluorspar added to the raw material vary from (0.25 % to 1% by steps of 0.25 %). It is added to the raw meal to prepare 9 g of a homogeneous mixture. Clinkers were synthesized in a kiln type Nabertherm. The temperatures of cooking varied between 1300 and 1450°C. The basis of assessment of raw materials was the estimation of free lime and C3S content. The burnability behavior of clinkers produced was investigated by Optical Microscopy (MO). The experimental results can show that the addition of small amounts of fluorspar (0.75 %) to cement raw material accelerates the formation of alite (C3S) phase and intensifies the process of the free lime combining during the clinkerisation. We can also conclude that we can perform a good burnabiliy of raw material at temperature of 1300°C instead of 1450°C. Keywords— raw material; fluorspar; clinkers; alite; free lime; burnabiliy
—The aim of the present research is to improve the manufacturing conditions of cement and therefo... more —The aim of the present research is to improve the manufacturing conditions of cement and therefore its quality. For this purpose, various reference samples of clinker were produced in the normal manufacture's conditions considered by the Company of Cement of Gabes, then compared to other samples which are variable in the Lime Saturation Factor and the raw material's fineness. All the samples are analyzed by X-Ray Fluorescence, X-ray diffraction and optical microscopy including a study of measurement of clinker's crystal sizes. Besides, tests of compressive strength were made after 2, 7 and 28 days. Finally, a study of clinker's grindability enabled us to evaluate the probability of grinding of these samples. In all cases, the best clinker is the one that has a vintage's fineness close to 13-15% for the refusal of 100 µm. This latter gives a well-formed clinker nodules, well homogenized phases and indicating cement's good quality. This clinker presents also the best grindability.
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