(a) PHYSICAL REQUIREMENT
Strength and granuometry are the two important physical requirements. The ore should be hard and possess  high  strength. The optimum  tumbler strength  of   the ore shuold be 80 percent minimum. Depending  on  the reducibility, closely  calibrated ores in the size range of 5 to18 mm are generally used.
 (b) METALLURGICAL REQUIREMENT
The ore should be highly reducible, thermally stable and have a low tendancy for sticking and disintegration during heating and reduction.

 
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