Efecto de las calizas agregadas a las pastas empleadas en la fabricación de productos cerámicos de construcción del área metropolitana de Cúcuta

The present work was developed to determine the effects generated by limestones in the principal variables of control of the process of production of ceramic articles of construction not enameled that are made in the Zona Metropolitana de Cúcuta, using the atmosphere oxidizer in the process of firing and the technology of extrusion for his shaped one. The investigation was carried out using a sample of clay and a sample with high place contained of silica from the municipality of Los Patios, Norte de Santander and limy rocks from the locality of La don Juana jurisdiction of Bochalema municipality. Different mixtures were elaborated increasing the content of limestones to which one submitted them to the process of shaped using an extruder of manual laboratory, the samples obtained were submitted later to a process of dried in laborator stove up to a temperature of 100ºC, the firing was carried out by a period understood between 6 and 8 hours in an electrical oven in a range of temperature understood between 980ºC and 1100ºC, increasing in gradients of temperature of 20 centigrade degrees. At the end of the process tests were realized to determine the water absorption of the sintered samples. The realized experimentation allowed to establish that the limy stones used and added to the clays of the zone using the technology of extrusion as method of shaped, they contribute to a major merger of the material with regard to the traditional mixtures in additions in weight lower than 5 % being evident this to temperatures superior to 1020ºC, as result of the major merger under the established conditions, the addition of limy stones they do not facilitate the process of dimensional control of the ceramic articles submitted to firing