High Alumina Refractory Brick Better Slag Resistance
High alumina firebrick, an aluminous refractory with aluminum oxide content of more than 48%.The raw materials with high alumina or other alumina are formed and calcined.Thermal stability, high refractoriness in more than 1770 ℃.Good slag resistance.
There are usually three categories:
Ⅰ etc: Al2O3 content of 75% or more;
Ⅱ etc: Al2O3 content is 60% ~ 75%;
Ⅲ etc: Al2O3 content is 48% ~ 60%;
It can also be classified according to its mineral composition, which is generally divided into: low mullite (si), mullite, molishi - new jade, corundum - mullite and fresh jade 5.
One of the important properties of high alumina firebrick is the structural strength at high temperature, which is usually evaluated by the weight softening deformation temperature.High temperature creep is also measured to reflect its high temperature structure.The test results show that the temperature of the load softening increases with the increase of Al2O3.
Al2O3 content is above 70% of high alumina firebrick, and the weight softening temperature depends on the proportion of the amount of mullite phase and liquid phase, which increases with the increase of the amount of mullite.The quantity and properties of liquid phase have obvious effect on the softening temperature of lotus.Therefore, reducing impurities in raw materials can improve the temperature and creep of lotus.
The production process, high alumina firebrick and clay brick molding production methods are basically the same.There are some technological parameters that differ.There are also comminution, mixing, molding, drying, burning, inspection, packaging and other technological processes.At low temperature, the compressive stress is better but it is reduced slightly at high temperature so it is less than 1 meter in the kiln.Production technology of high alumina refractory brick and clinker clay brick similar difference between the higher percentage ingredients of clinker can be as high as 90% ~ 9% clinker grading sorting and screening before crushing the iron sintering temperature is higher, such as Ⅰ, Ⅱ high aluminum refractory brick with tunnel kiln firing when the general is 1500 ~ 1600 ℃.
The production practice has proved that high alumina clinker can improve the quality of high alumina firebrick by strict selection of grading and storage of bauxite clinker and combining clay with clay.
USES, mainly used in masonry blast furnaces, hot blast furnaces, electric stove top, blast furnace, reverberatory furnace, rotary kiln lining.In addition, high alumina firebrick is widely used as a plaid, pouring system plug, water block, etc.