Influence of porosity on refractory product strength

Improving the quality of refractories and decreasing the specific consumption of these products per a production unit through using of modern resource-saving processes is a highly relevant task in manufacturing refractory materials for metallurgical purposes. Strength and porosity are important indicators affecting operational properties of refractory materials. The object of research is refractory products made of clay from Beloe Glinishche field (Karaganda region) in a clay bond. The use of raw materials of the Kazakhstan origin reduces the product costs, decreases the import of goods, and on the condition of receiving refractory materials with higher mechanical and operational characteristics, gives the prospect of product export. The porosity of refractory products made of clays from various fields is determined. The effect of chamotte mixture moisture content on the compressive strength of refractory products is identified. It is found out that the most expedient is the following technological mode of refractory product manufacturing: pressing of samples from furnace charge for 12 seconds, (initial) pressure is 22 MPas which in 7-8 seconds has been increased up to 27 MPas. Then sintering has been carried out at the temperature of 1250-1270 °C for 12 hours. The use of the clay from Beloe Glinishche field in the composition of a clay binder allows to achieve uniform porosity and higher strength of the product.

metallurgical aggregates, clay, refractory, porosity, pycnometric method, binder, pressing