Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?
Correct answer: D. 90
- A. 55
- B. 70
- C. 80
- D. 90
Explanation
High-grade bauxite can provide roughly 85 to 90% alumina after processing, so the maximum listed value is 90%. Lower values correspond to less-pure bauxite or other alumina-bearing raw materials.
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