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Which type of rotary dryer is used in manufacture of sodium tri polyphosphate?

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Which type of rotary dryer is used in manufacture of sodium tri polyphosphate?

(a) Rotary drum dryer

(b) Indirect fired and cooled rotary dryer

(c) Rotary vacuum dryers

(d) Direct rotary dryers

The question was asked during an interview.

Query is from Inorganic Chemical in section Inorganic Chemical Industries of Chemical Technology

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Best answer
Correct choice is (b) Indirect fired and cooled rotary dryer

The best I can explain: The sodium tri polyphosphate solution is filtered, dried, cooled and annealed along the length of the indirect fired and cooled rotary drier.

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