Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at ______________ °C?
Correct answer: D. 1400-1450
- A. 250-300
- B. 500-750
- C. 950-1050
- D. 1400-1450
Explanation
Phosphate rock is reduced with silica and carbon in an electric furnace, where the fusion zone must be maintained near 1400–1450°C. The lower temperature ranges cannot sustain the required melting and reduction reactions.
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