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To upgrade the poor quality phosphate rock, Dorr-Oliver made few modification such as?

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in Fluidization Engineering by (102k points)
To upgrade the poor quality phosphate rock, Dorr-Oliver made few modification such as?

(a) Three-stage fluidized bed

(b) 5 meters diameter

(c) Height 12 meters

(d) All of the mentioned

I have been asked this question during a job interview.

My doubt is from Calcination of Limestone, Dolomite, and Phosphate Rock topic in section Industrial Applications of Fluidized Beds of Fluidization Engineering

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Correct choice is (d) All of the mentioned

For explanation: Above specifications were incorporated for in their design.

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