Model Predictive Control for SAG Milling in Minerals Processing Steven J. McGarel, Rockwell Automation Introduction SAG and ball mills are generally accepted as the largest power consumers in a mining and mineral processing operation and can be 80% of total electrical energy consumed at a specific power consumption of around 20kWh/ton.

2 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)

Scale-up criterion is the net specific power consumption, i.e. the power consumed by the mill rotor itself minus all mechanical and electrical losses divided by the feed rate of solids. For the full scale mill, specific power is multiplied by the feed rate to get the net mill power.

Grate Discharge Ball Mill: This type of mill usually works with a high circulating load and thus produces very little extreme fines. The specific power consumption is therefore less than for an Overflow Mill. A Grate Discharge Mill will also have 15—25 % higher capacity per volume unit as compared with an Overflow Mill.

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If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work ...

Previous investigations have shown that the specific energy input is the overall parameter of influence on product size during communition in agitated ball mills, from laboratory up to industrial scale. The specific energy input is the introduced energy related to the amount of comminuted material. This parameter can be used for mill scale‐up.

Specific Power Consumption Of Ball Mills For Li Ne. Home / Specific Power Consumption Of Ball Mills For Li Ne. Ball mill abrasion index sgs minerals services t bond ball mill work index and modified bond work index data can be used in the ceet grinding simulatorthe abrasion test determines the abrasion index which can be used to determine steel.

Upgrading from a conventional grinding system can, in some cases, more than double your production capacity, while also reducing specific energy consumption by 30 percent. In ball mills, for example, less power is required to produce finished cement from Hydraulic Roller Press-pressed material than from un-pressed material.

Abstract: In determining the proper mill size required to meet a targeted production rate, many factors are evaluated including: length to diameter (L/D) ratio, individual compartment lengths, rotational velocity, liner type, ball gradation and percent filling degree. This paper examines the effects of changing mill filling degree with respect to specific power consumption (kWh/ton) and ...

the mill power and the efﬁciency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or speciﬁc energy model which do not con-sider the projected feed size distribution it is likely that this mill will reach the expected power consumption …

The main energy issue was the high power consumption of mill fans, . For ball mills, . Get Price And Support Online; how to calculate the energy consumption of a ball mill. The specific selection function effect on clinker grinding efficiency in,- how to calculate the energy consumption of a ball mill . ball mill, power consumption, .

Ball Mill Design/Power Calculation - LinkedIn. If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work ...

Closed Circuit Ball Mill System. Clinker, Gypsum and other desired additives are fed to the ball mill in specific proportions based on the quality requirement. Feed material is ground in the ball mill, discharged and fed to a classifier with the help of a bucket elevator for classification of the ground cement into two streams – coarse and fines.

mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential ...

VRM vs Ball Mill for Cement Grinding - Page 1 of 1. 10/02/2016 re VRM vs Ball Mill for Cement Grinding. Specific power consumption- high for ball mill and Low for VRM ; Maintenance costs- high for VRM and low for Ball mill ; Process control/process technology- ball is operation friendlt and simple in operation but VRM requires some PID or

The proposed model for determining the power consumption of a ball mill allows an assessment of the efficiency of electric energy consumption and electric mills identify qualitative indicators of ...

Ball Mill Specific Power Consumption Ball Mill Specific Power Consumption specific power consumption of ball mills for A cement mill is the equipment used to grind the hard nodular clinker from the cement kiln into the fine grey powder that is cement Most cement is currently ground in ball mills …

TECHNICAL NOTES 8 GRINDING R P King Mineral Technologies, ball mill power calculation,Figure 85 Effect of mill filling on power draft for ball mills The data, A simple equation for calculating net power draft is, Austin's formula gives slightly higher values than Morrell's for mills that have length equal Power Consumption ...

contributed to an increased rate of production and reduced specific power consumption in the grinding operation and wear rates. Vertical Roller Mill (VRM) The power used for the actual grinding process while grinding raw materials, depends mainly on the hardness of raw materials and the type of mill used, i.e. ball mill or vertical roller mill.

In the last decade vertical mills have taken an increasing share of the cement milling market, not least because the specific power consumption of vertical mills is about 30% less than that of ball mills and for finely ground cement less still.

Feb 10, 2016· re VRM vs Ball Mill for Cement Grinding. Specific power consumption- high for ball mill and Low for VRM ; Maintenance costs- high for VRM and low for Ball mill ; Process control/process technology- ball is operation friendlt and simple in operation but VRM requires some PID or …

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed ...

Ball Mill Design/Power Calculation Ball Mill Grinding Capacity Calculator Ball Mill Motor/Power Sizing Calculation Ball Mill Design/Sizing Calculator The power required to grind a material from a given feed size to a given product size can be estimated by using the following equation: where: W = power consumption expressed in kWh/short to (HPhr/short ton = 1.34 kWh/short ton) Wi ...

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