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Leyes de Pb y Zn en concentrado rougher<br />
grade in rougher concentrate<br />
(%)<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
<strong>20</strong><br />
10<br />
0<br />
0g 6g 15g <strong>20</strong>g<br />
iron addition<br />
Pb Zn
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