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Mills usually operate in the range 6582 of critical but values as high as 90 are sometimes used A crucial parameter that defines the performance of a 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

Chat Online### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

Ball mill power draw predicted from the Denver slide rule kW 0 200 400 600 Calculated ball mill power draw from the m odel derived kW Data compared Line y=x Fig 2 Comparison of the ball mill power draw from the Denver slide rule and the proposed model Dashed line corresponds to y=x

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ball mill model This ball mill and rod mill power draw model is based on a torque model and empirical measurements made by the Equipment Company for use by its sales representatives to size grinding mills Slight differences in the equations used allow rod mills dry ball mills and wet overflow and grate ball mills to be sized

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The method for determining the ball load and the grinding capacity from the power consumed by the ball tube mill under operating and emptying conditions is presented The implementation of this method when grinding gas coals in the ball tube mill of the ShBM 370/850 Sh 50a type is discussed

Chat Online### Ball MillsMineral Processing Metallurgy

However it is now commonly agreed and accepted that the work done by any ball mill depends directly upon the power input the maximum power input into any ball or rod mill depends upon weight of grinding charge mill speed and liner design Working Principle Operation

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Chat Online### Analysis of Power Draw in Ball Mills by the Discrete

Abstract Ball mills like other comminution devices consume large amounts of energy Mill operators often have to assess the power draft of mills for an entirely different set of operating conditions or for a reconfigured circuit It is shown that the power draft can be accurately predicted from analysis of the motion of the charge The motion of the charge is rigorously simulated with a

Chat Online### Effect of Energy Input in a Ball Mill on Dimensional

The grinding tests were performed in a laboratory 0 204 0 166 m D L ball mill that operated at 66 rpm corresponding to N r = 70 4 of its critical speed under dry conditions as seen in Table 1 The ball filling volume J and the material filling volume f c were calculated using Eqs

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mills and use a rod mill feed size F80 of 16 000 m and a rod mill µ product size of 1 000 m Also note µ that in order for no correction factor for ball mill product fineness to apply the ball mill circuit P80 should be no less than approximately 70 µm See reference by Bond 1962

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A vertical spindle mill is also designed for pressurized and suction type requirements Boiler designers use this type of mill for poor quality coal as this type of mill rejects foreign materials like stones and other high density materials The power consumed by the mill per ton of coal ground is only two thirds of the ball mills

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The product from the SAG mill is further reduced in size using pebble crushers and ball mills Hence typical gold or copper ore requires between 2 0 and 7 5 kWh per ton of energy to reduce the particle size Considering a typical mining operation processes 10 000 to 100 000 tons per day the energy expenditure in grinding is 50 percent of the

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Planetary ball mills 9 Vibration Mills 10 Mixer Mill MM 400 11 Feed material hard medium hard soft brittle elastic fibrous Material feed size ≤ 8 mm Final fineness 5 µm Setting of vibrational frequency digital 330 Hz min 1

Chat Online### USING THE SMC TEST TO PREDICT COMMINUTION

However in this situation the ball mill has to supply this energy and it has a different higher work index than the crusher ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction Hence from equation 7 to crush to the ball mill

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Chat Online### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

Describe the components of ball mill Explain their understanding of ball mill operation Explain the role of critical speed and power draw in design and process control Recognize important considerations in ball mill selection Reading Lecture In ball mills steel balls or hard pebbles to break particle based on impact and attrition

Chat Online### Analysis of ball mill grinding operation using mill power

With a view to developing a sound basis for the design and scale up of ball mills a large amount of data available in the literature were analyzed for variation of the two key mill performance parameters power specific values of the absolute breakage rate of the coarsest size fraction S and absolute rate of production of fines F with some of the important operating and design variables such as the mill speed ball load particle load ball diameter and mill

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If a ball mill uses water during grinding it is a wet mill A typical ball mill will have a drum length that is 1 or 1 5 times the drum diameter Ball mills with a drum length to diameter ratio greater than 1 5 are referred to as tube mills Ball mills may be primary or secondary grinders

Chat Online### Scale‐up of power consumption in agitated ball mills

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

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the mill builder can provide the gear designer with input power and output speed The next step is the interface dimen sions Since the gear needs to turn the mill it needs to have a bore larger than the mill outside diameter The mill out side diameter is a function of the grind ing process selected Autogenous mills

Chat Online### Ball Millan overview ScienceDirect Topics

The ball mill is a tumbling mill that uses steel balls as the grinding media The length of the cylindrical shell is usually 1–1 5 times the shell diameter Figure 8 11 The feed can be dry with less than 3 moisture to minimize ball coating or slurry containing 20–40 water by weight

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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 index of 15 and a size distribution of 80 passing ¼ inch 6350

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Chat Online### The effect of ball size distribution on power draw charge

Keywords discrete element method ball mill ball size distribution mill power breakage mechanism 1 Introduction The power draw and grinding efficiency of tumbling mills depend solely on motion of the grinding charge and the ensuing ball collisions that utilize the input power

Chat Online### MODULE #5 FUNCTIONAL PERFOMANCE OF BALL MILLING

Output = Input x Efficiency In a ball mill circuit the output can be defined as the production rate of fines of the circuit As for any output ball mill circuit output is a function of both its inputs and efficiencies There are two inputs to a ball mill circuit the ore fed to the circuit and the power delivered by the grinding mill

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Mill Power Draw Models including the range of circulating load in the ball mill and the superficial velocity of pulp through a ball mill Power at the mill shell power values as they are measured in the plant distributed control system DCS which is usually relative to the motor input power

Chat Online### TECHNICAL NOTES 8 GRINDING R P King

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

Chat Online### Ball Mill Design/Power Calculation

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

Chat Online### Analysis of Power Draw in Ball Mills by the Discrete

Abstract Ball mills like other comminution devices consume large amounts of energy Mill operators often have to assess the power draft of mills for an entirely different set of operating conditions or for a reconfigured circuit It is shown that the power draft can be accurately predicted from analysis of the motion of the charge

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The load of balls in a ball or tube mill is normally such that when the mill is stopped the balls occupy about one half the volume of the mill The void fraction in the mass of balls when at rest is typically 0 40 When the mill is rotated the balls are picked up by the mill wall and carried nearly to the top where they break contact with

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The advantages of ball and race mill are as follows Lower capital cost Lower electricity power consumption Lower workspace required Lower weight However in ball and race mill there is greater wear as compared to other coal pulverizers The usage of pulverized coal as a fuel has now become the standard method of firing in many huge boilers

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