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In calcium phosphate production, phosphate rock lumps are crushed in which crusher?

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In calcium phosphate production, phosphate rock lumps are crushed in which crusher?

(a) Cone crusher

(b) Gyratory crusher

(c) Roll crusher

(d) Jaw crusher

The question was asked during a job interview.

My question is taken from Inorganic Chemical topic in division Inorganic Chemical Industries of Chemical Technology

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Correct answer is (d) Jaw crusher

To explain: In calcium phosphate production, phosphate rock lumps are crushed in a jaw crusher and ground to 100 mesh in a hammer or ring mill and further mixed with H2SO4 to gives superphosphate.

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