Ball mill optimization Improving conveyor performance Ball mill classification system optimization through functional performance modeling by R E McIvor K M Bartholomew O M Arafat and J A Finch material kW × mill grinding rate of coarse material t/kWh The circuit classification system efficiency CSE is the percentage of the mill solid material content that is coarser than the **-ball mill kwh-**,Ball mill TPH VDChariBall mill TPH Specific energy for cement grinding in a ball mill at 3000 cm2/gram blain value = G kwh/t Product blain required = L cm2/gram Mill effective diameter in meters = D m Media load in the mill = M mt We have to calculate the Blain correction factor = Bc The Grindability factor …… **Get More**

### Ball mill optimization Improving conveyor performance

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### Calculation of energy required for grinding in a ball mill

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### A Method of C alculating Autogenous/ Semi-Autogenous

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Ball mill classification system optimization through functional performance modeling by R E McIvor K M Bartholomew O M Arafat and J A Finch material kW × mill grinding rate of coarse material t/kWh The circuit classification system efficiency CSE is the percentage of the mill solid material content that is coarser than the

Ball mill TPH Specific energy for cement grinding in a ball mill at 3000 cm2/gram blain value = G kwh/t Product blain required = L cm2/gram Mill effective diameter in meters = D m Media load in the mill = M mt We have to calculate the Blain correction factor = Bc The Grindability factor

SAG Mill Grinding Solutions offers the following tests for SAG mill testing and/or sizing JKTech Drop Weight The JKTech Drop-Weight Test measures the breakage characteristics of an ore for five size fractions in the range of 13 to 63 mm at various energy inputs 0 1 to 2 5 kWh/t

Bond Ball Mill Work Index BWi kWh/t 13 4 Bond Rod Mill Work Index RWi kWh/t 18 1 Table 1 Example of AG/SAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have

The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution The

on a century or more ball mill systems were used for all three grinding stages but the development of more energy-efficient vertical roller mills VRMs led to their replacement Ball mill system Loesche Power consumption kWh/t VRM system 20 40 60 80 100 120 140 160 Fineness acc to Blaine cm2/g

Calculation of energy required for grinding in a ball mill Int J Miner Process 25 41-46 The Bond work index Wi as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product

Worn out state Normal state* Grinding energy Mill output * 39 kWh/t 65 t/h Gap 32 kWh/t 92 t/h -18% +40% after the replacing of liners and ball charge The Ball mill ATC Process March 2004 19 How are the liners and the ball charge Wear of the liners and ball charge has to be looked after in order to avoid performance losses

consumption by 1-2 kWh/t for a closed circuit mill & 2-3 kWh/t for an open circuit mill a sheer waste if this is not required by the market 20 25 30 35 40 45 50 55 60 Ball mill improvements Case Example 1 Diaphragm replacement 2011 Plant name Country Lafarge Austria

ball mill work index was averaging only 11 6 kWh/t which is not hard A rod mill work index ﬁ gure was not found but was thought to be in the 16 kWh/t to 18 kWh/t range The Xstrata Zinc 22 ft ID × 40 ft EGL over ow ball mill ﬂ

By replacing ball mills with vertical or horizontal roller mills in raw material preparation energy savings of 6-10 kWh/t-raw materials depending on grindability of raw material can be achieved

MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up Bond's Law Data zBond work index w i zFeed D f and product d size both 80% cumulative passing Result The specific grinding energy w Mill power draw P = wT where T the mill capacity Mill dimensions from Tables or charts

• The coarse clinker is ground in the first chamber of the ball mill where large size ball 90 mm 80 mm 60 mm 50 mm are used • Here the incoming particles are crushed from 25 mm to less than 2 5 mm

Mill kWh/t 18 3 35 2 Classifier KWh/t 0 36 4 7 but produced in a vertical roller mill or ball mills samples from each of the plant s mill types were Contact the manufacturer --> Complete Solutions for Cement and Minerals

Index 7 kWh/t -10 6 kWh/t Crushing Indexand 8 5kWh/t -10 85 kWh/t Ball Mill Work Index with a resultant optimum grind size of 80% passing 212 microns The flotation circuit was expected to achieve a

The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution The following shows how the size or select the matching mill required to draw this power

Variable frequency drive VFD for Chinaware ball mill With the world facing a growing energy crisis because of limited oil reserves and carbon emissions causing global warming China is dedicated to optimizing its energy management

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