Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with__________________?
Correct answer: B. Lead or acid-proof bricks
- A. Acidic refractory
- B. Lead or acid-proof bricks
- C. Karbate
- D. Rubber
Explanation
The wet-process phosphoric-acid reaction is strongly corrosive, so the steel digestor requires a lead or acid-proof brick lining. Ordinary steel or acidic refractory alone would not provide adequate protection.
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