Discussion
Assertion (A): High gradient magnetic separators are used on china clay slurries.
Reason (R): The iron-bearing minerals present are too weakly magnetic for a conventional separator.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the necessity. The iron and titanium minerals discolouring china clay are weakly paramagnetic, not ferromagnetic, so an ordinary separator exerts too little force on them. A high gradient machine fills the gap with a fine ferromagnetic matrix, which concentrates the field into very steep local gradients and captures particles a conventional magnet would pass straight through.
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