Originally Posted by mobin
first off, good on ya brother for putting out out these awesome vids showing your work. need more of that!
i dont recall if it was this one or another one of your videos where you talk about the different colors of alumina, could it be acidic vs neutral vs basic alumina?
Thanks! It is a great hobby because it keeps the mind engaged and the rewards are worth it lolz.
Here is a copy and paste from what I learned on Alumina:
BFA and WFA similarities are as follows;
Both basic mineral: α-Al2O3
Both PH Value: Neutral
Both Max.usable temperature in air is 1900 Celsius degree, decomposition point is 2250 Celsius degree.
Both main chemical composition of finished products are: Al2O3
Both main applications are: in refractory and abrasives products.
Both Mohs hardness are: 9.0,
Differences are below;
BFA bulk density is (1.53~1.99g/cm3) and true density (3.90g/cm3). While WFA bulk density (1.75~1.95g/cm3) and true density (3.95~3.97g/cm3).
Main raw material of BFA is bauxite, and main raw material of WFA is calcined alumina powder.
BFA has Al2O3 content of 95% Min., WFA has Al2O3 Content of 99% Min.
BFA has refractory temperature 1850 Celsius degree, WFA has refractory temperature 2100 Celsius degree.
Although their Mohs hardness is 9.0,WFA is even harder than BFA, and BFA is more flexible than WFA.