By reduction process of carbon using bauxite grade 70-75, anthracite, etc. Phasing out the impurities, while the Ferro silicon is generated, with B.D of 6-7g, which is greater than BFA 3.99g, lies on the bottom of the furnance. The bonding part of Ferro silicon and BFA has higher Iron impurities which also be treated as Lower grader BFA.
There are two production method, 1.Tilting Furnance, 2.Fix Furnance
Titling Furnance stands our with more efficient and quality orient method by mimimal interruption, continuosly pouring melting material for cooling process.
With huge energy consumption during fusing process, electricity cost becoming major concern of many manufacturer.
Some even facing power outrage by government restriction due to enviromental protection, which causing quality troubles for BFA materials.
For example, if you stop the heating process during the middle of cooking, and restart heating after a while,
the food will not taste as good as it should be. Same applies to BFA, where the corrundum phase is not fully developed.
During crushing and sieving, due to the hardness of BFA, fines are usually produced by using finer grade of Abrasive residues.
Where the alumina content start to drop below 95%. Some producers trick alumina content with other high alumina alternatives,
such as dust collection fine.
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