Is it the same thing to change the rewarming line of the refractory and to change the permanent line
Mainly in the firing process, due to uneven temperature or lack of time and other effects, so that the firing is not sufficient, in its long-term use, by high temperature, some physical and chemical changes will continue, so that the refractory The volume of the material expands or shrinks This change has a great damaging effect on the masonry of the thermal kiln, and it is necessary to strengthen the firing control in the production of the product so that the index is controlled within the standard even to a smaller value Commonly used refractory baking line changes in the national standards are provided Rebirth line changes, also known as residual line changes, refers to the firing of refractory material heated to high temperature, the length of the irreversible changes occurred The specific definition is that the refractory sample is heated to the specified temperature The residual expansion or contraction of the length after cooling to room temperature for a certain period of time Heating constant line change rate refers to the firing of the fire-resistant ball again heated to the specified temperature, heat for a certain time, cooled to room temperature after the residual expansion and contraction Positive sign "+" means expansion, negative sign "-" means contraction It is an effective process to increase the firing temperature and prolong the holding time in order to control the change rate of the permanent cooling of the refractory ball within the standard even lower But it should not be too high, otherwise it will cause the deformation of the fireball, glass vitreous, reduce the thermal shock resistance
For the chemical composition of the same refractory reburning line change the original
The change of burner line is an important index to evaluate the quality of refractory
