Bauxite is often used in our production. It can be used in the production of refractory material. So, do you know several factors that affect the refractoriness of bauxite?
It is well known that bauxite is a natural mineral that is hidden underground and is called raw bauxite. Then the bauxite is calcined at high temperature in the kiln. The bauxite in vertical kiln is white, the bauxite in rotary kiln is dark blue and the bauxite in flame kiln is bluish blue. At the same time, the bauxite will be different color and appearance as well as different refractory temperature and strength because of different content. The manufacturers of bauxite also carry out manual grading process according to the different quality of bauxite. What are some of the factors that affect the fire resistance of bauxite? So, what factors will affect the fire resistance of bauxite?
First of all, the most important influence on the fire resistance of bauxite is the aluminum content. The ore containing more than 50 percent aluminum is called bauxite, and bauxite is carefully graded. Bauxite with a content of no less than 85 percent is called super-grade bauxite, bauxite with a content of no less than 80 percent is called first-level bauxite, bauxite with a content of no less than 70 percent is called second-level bauxite, and bauxite with a content of no less than 50 percent is called third-level bauxite. The reason that bauxite has a high fire resistance and can be used in refractory material is because of its high aluminium content. The higher the content of AL2O3 in ore, the higher the refractory temperature of bauxite has. Conversely, the lower the AL2O3 content, the lower the refractory temperature of bauxite.
Secondly, the trace elements, potassium and sodium in bauxite also affect the refractory temperature. With the same aluminum content, the higher the content of potassium and sodium in the ore, the lower the refractory temperature will be. Conversely, the lower the potassium and sodium, the higher the refractory temperature. Therefore, when selecting bauxite, we will try to choose ore with low content of potassium and sodium to improve the product's fire resistance. But, are there no USES for bauxite with high potassium and sodium? No! Because bauxite with high potassium and sodium content does not have a high refractory temperature, it can be sintered without a high temperature in the calcination process, which saves a lot of costs. At the same time, after the sintering of aluminous bauxite with high potassium and sodium content is completed, it is used in the manufacturing of middle and high aluminum balls in the ceramic industry. In the process of secondary calcination, it also does not need very high temperature to complete the manufacturing, which also saves a large amount of cost!
In addition, the iron content of bauxite also affects the refractory temperature of bauxite. The higher the Fe2O3 content in bauxite, the lower the refractory temperature will be. Conversely, the lower the iron content, the higher the refractory temperature will be. The reason is that when bauxite is used as a refractory material in the high-temperature area of the kiln, the free iron in bauxite will be melted into molten iron if the content of iron is high, and the refractory temperature will be greatly reduced. At the same time, when we are making shaped refractory materials, if the content of Fe2O3 in bauxite is too high, the product will appear a lot of rust spots after production, not only affect the appearance of the product, but also affect the performance of the product.
Finally, the density of bauxite also affects the refractory temperature of bauxite. The higher the density of bauxite, the higher the refractory temperature and the higher the wear resistance will be. Conversely, the lower the density of bauxite, the lower the refractory temperature of the product will be.
In general, the higher the aluminum content of bauxite, the lower the iron content, the higher the density, the higher the refractory temperature, and vice versa. However, not all bauxite is the same. There is a kind of bauxite in henan province in
