Model:Bond-Rowland SSBM

Bond Single Stage Ball Mill Model

This is a multi-stage crushing plant feeding a ball mill model that estimates the specific energy consumption (E_BM) using the Rowland interpretation of the classical Bond work index equation including Rowland efficiency factors.

$E_{ssbm} = Wi_{C} \times \left ( \tfrac {10}{\sqrt{ 9400 }} - \tfrac {10}{\sqrt{ F_{80} }} \right ) + Wi_{RM} \times \left ( \tfrac {10}{\sqrt{ 2100 }} - \tfrac {10}{\sqrt{ 9400 }} \right )\times EF_4^{RM} + Wi_{BM} \times \left ( \tfrac {10}{\sqrt{ P_{80} }} - \tfrac {10}{\sqrt{ 2100 }} \right ) \times EF_4^{BM} \times EF_5$ ^{Rowland, 2006}

$E_{total} = E_{crusher} + E_{ball}$

The rod mill oversize feed factor (EF₄^RM) is calculated using the greater of the sample's rod mill or crushing work index. The optimal feed size and EF₄ are both calculated using whichever is greater.

The ball mill oversize feed factor (EF₄^BM) is always calculated with the ball mill work index. The optimal feed size for the EF₄^BM is always calculated using the rod mill work index.

Default parameter values

• Assumed crusher product P₈₀ size, µm = 9400
• Hypothetical rod mill product size, µm = 2100 (mid-point of the range between typical rod mill work index test P₈₀ and typical ball mill work index test F₈₀).