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/"%+01" 2+3$&'4&" -$ 2%$567(89",'%"+ :; !$?(4$,

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Hogg and Fuerstenau Model (1972)

PowerdrawPnet = Pgross = 0.238 D

2.5L Nc ap(J - 1.065 J2) sin

#$

$

$

Pgross = gross power draw of the mill (kW) = Pnet/ !. ! = electrical and power transmission efficiency, /1.

D = effective mill diameter, ft.

L = effective mill length, ft.

Nc = tumbling speed; expressed as a fraction (/1) of the critical speed

J = apparent volumetric fractional mill filling, /1

# = charge lifting angle (defines the dynamic positioning of the center of gravity of

the mill load (the kidney) with respect to the vertical direction. Typically in the range of 40 to 45.

!"#$& '()*+,-

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9"-$,"+ &"% :!*

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2#(3( Y'1'#(%#$

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./012 345

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:;< M5(%+[$5 :'>$ MWX

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01 # /234554

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9"-$," = L(55(#

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/22 M"#(, 3"5 :N 9"55$,

^a

shcbaT WWWWWW ++++=

(3)

donde:

1. Wa= energa especfica para moler partculas ms gruesas en molinos

2. Wb= energa especfica para moler partculas ms finas en molinos

3. Wc= energa especfica para chancador convencional

4.W

h=energa especfica para HPGR5. Ws= correccin de la energa especfica para la distribucin de tamao.

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/22 3"5 9"55$,

^S

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/22 3"5 !',"#(b$+

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%

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!""

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+$,-./01234)-5.6 7 82/95852/46 2:4-.852/*

;-04

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9$#"-","67( *TM 3(5( 1",'$%-(

:;(% -(#"+ '%-0+#5'(,$+

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