The basic parameters used in ball mill design power calculations, rod mill or anytumbling millsiing are material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating solids or pulp density, feed sie as F80 and maximum 8216chunk sie8217, productsie as P80 and maximum and finally the type of circuit openclosed you are designing for.
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Use this online calculators for Motor Siingand Mill siingas well as mill capacity determinators.
In extracting fromNordberg Process Machinery Reference ManualI will also provide 2 Ball Mill Siing Design example done 8216by-hand8217 from tables and charts. Today, much of this mill designing is done by computers, power models and others. These are a good back-to-basics exercises for those wanting to understand what is behind or inside the machines.
The power required to grind a material from a given feed sie to a given product sie can be estimated by using the following equation.
W power consumption expressed in kWhshort to HPhrshort ton 1.34 kWhshort tonWi work index, which is a factor relative to the kwhshort ton required to reduce a given material from theoretically infinite sie to 80 passing 100 micronsP sie in microns of the screen opening which 80 of the product will passF sie in microns of the screen opening which 80 of the feed will pass.
Open circuit grinding to a given surface area requires no more power than closed circuit grinding to the same surface area provided there is no objection to the natural top-sie. If top-sie must be limited in open circuit, power requirements rise drastically as allowable top-sie is reduced and particle sie distribution tends toward the finer sies.
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 sie distribution of 80 passing inch 6350 microns. The required product sie distribution is to be 80 passing 100 mesh 149 microns. In order to determine the power requirement, the steps are as follows.
A motor with around 1400 Horse Power is calculated needed for the designed task. Now we much select a Ball Mill that will draw this power.
The ball mill motorpower 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 sie distribution. The following shows how the sie or select thematching mill required to draw this power is calculated from known tables 8216the old fashion way8217.
specific power consumption of ball mills for line. VRM vs Ball Mill for Cement GrindingPage 1 of 1. calculate specific power consumption of a ball mill Mill grinding A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. To calculate the needed grinding work against the grain sie changing.
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 yx Fig. 2. Comparison of the ball mill power draw from the Denver slide rule and the proposed model. Dashed line corresponds to yx.
Although ball mills the ball mills for obtaining maximum production and minimum specific energy consumption. Roller press in semi finish and finish grinding mode. The velocity of gases calculated through mill is 1.29 msec.
power consumption of roller mill room-with-a,Power Consumption Mill Drive,the specific power consumption of a ball mill is,300TPH Cobble Crushing Line In Russia Crushing Plant in Mali Limestone Crushing.
The ball mill specific power consumption e ball is determined by deducting a cone crushing ponent from the bondrowland e s specific power consumption see the base formulae in the bond s model where cf is the es calibration factor in the how to improve the grinding efficiency of the ball mill. More Details.
how to calculate power consumption in ball mill. specific power consumption of ball mills for line specific power consumption of ball mills for line Head off address Follow us HOT MACHINE HJ, Oct 7, 2014 firstly predicted using the SAG mill feed F80 and the ball mill cyclone overflow power consumption andor specific energy in actual SAG.
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 1525 higher capacity per volume unit as compared with an Overflow Mill.
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 sie of the grinding product. Therefore, in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when, for a given sie of grinding product, the value of the work index Wi, which is determined by experiments, is not known.
This problem is considered in this paper and some solutions are put forward. Experiments were made on copper ore, andesite and limestone, and it was found that the change of the mass passing a test screen G could be related to the aperture sie Pk of the screen by the formula GK1Pk. The grinding-product sie, P, in a Bond ball mill, which is given by the aperture sie which passes 80 of the grinding product as a function of the aperture sie of the test screen Pk, can be expressed by the formula PPkK2.
These functions for G and P enable us to calculate the value of Wi for any other sie of grinding product if we know the work index Wi and aperture sie of the screen Pk.
Dec 08, 2009nbsp018332Re how to estimate the wear rate for Ball mill. Most practical way to by measuring empty height and calculating the volumetric filling of grinding media.Alternative way to make track of mill main drive kW consumption reduction and add makeup charge according to the extent of fall in power consumption.
Oct 19, 2017nbsp018332There is a mathematical solution to this problem the Bond formula. It uses to help determine the grinding media optimal sie must be loaded into the ball mill for proper operation ensure. The calculation formula is below B the grinding balls diameter, mm.
We announced the launch of an online service on our website recently. It helps customers accurately calculate the mass of grinding media in the mill. We received more than a doen requests from our customers who took advantage of this service in a month.
It may be noted, that the service is designed exclusively to determine the grinding balls mass of in a ball mill. We focus on this, because at the same time we received many requests, the purpose of which was the assistance in determining the grinding ball range when loading the mill from scratch.
The difficulty of this calculation is to determine the average diameter of grinding balls in assembly, at which the required grinding quality will be achieved as soon as possible.
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