The influence of the grade of raw materials on the quality of white fused alumina?
The main raw material for the production of white fused alumina is industrial alumina, and to produce qualified white fused alumina, the content of raw material components is very high.
One of them is that the content of alumina in industrial alumina should be controlled above 98%, which cannot be lower than this value. The reason is that the alumina content of the white corundum we usually know is more than 99%, and if the alumina content of the raw material is too low, the content standard of the produced white fused alumina will definitely not be up to the standard. Both performance and quality are a big influence.
The other is sodium oxide. Generally, the content of sodium oxide is required to be less than 0.6%. And good quality will require it to be less than 0.3%. The high requirements for sodium oxide are mainly because the chemical properties of sodium oxide are relatively active and easy to react. If it reacts with alumina, a large amount of alumina will be consumed, which will easily lead to substandard alumina content and affect smelting.
In addition, if the content of sodium oxide is too high, the high temperature resistance of white fused alumina will be affected to a certain extent. Because of the special structure of white fused alumina, many impurities have a fluxing effect on it.
All in all, the production of white fused alumina must pay attention to testing the content of each component of its raw materials, otherwise it may be produced with white workmanship or unsatisfactory quality. It should be noted that, in addition to the content of alumina and sodium oxide, moisture, particle size, etc. need a little attention.