our products

D&Q Mining is a high-tech company integrating R&D, production and sales. It provides mature products and solutions such as crushers, sand making, milling equipment, mobile crushing stations, etc., for aggregate, mining and waste recycling.

how to calculate the ball mill discharge size distribution

How to Size a Ball Mill -Design Calculator & Formula

 A) Total Apparent Volumetric Charge Filling including balls and excess slurry on top of the ball charge, plus the interstitial voids in between the balls expressed as a percentage of the net internal mill volume (inside liners). B) Overflow Discharge Mills operating at low ball fillings slurry may accumulate on top of the ball charge; causing, the Total Charge Filling Level to

More

ball size distribution in ball mill calculation pdfs

The Effect Of Ball Size Distribution On Power Draw . 40%the effect of ball size distribution increased with increasing mill filling and for the mill filling of 35%the ball size distribution had the maximum effect on the power drawwhen the mill charge contained mono-sized ballsthe ball flow regime inside the mill transited to the cataracting and impact breakage was the main breakage mechanism

More

Ball Mill Design/Power Calculation LinkedIn

Dec 12, 2016· 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

More

ball mill filling degree calculation

Two chamb. mill sizing The Cement Grinding Office and initial idea for sizing a cement ball mill. calculation by changing the diameter value in point 5, the L/D ratio, the mill speed, the filling degree,

More

Calculate and Select Ball Mill Ball Size for Optimum Grinding

Aug 02, 2013· In Grinding, selecting (calculate) the correct or optimum ball size that allows for the best and optimum/ideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize “just in case”. Well, this safety factor can cost you much in recovery and/or mill liner wear and

More

THE OPTIMAL BALL DIAMETER IN A MILL

which can grind efficiently in a mill, c is the exponent which characterizes the ball size distribution. The condition for efficient grinding, defined by Eq. 7, will be fulfilled when the grain size distribution and the ball size distribution are the same, which means that the parameters of both distributions are equal in Eqs. 7 and 9: m c. (10)

More

Ball Mill Design/Power Calculation

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

More

Optimization of mill performance by using

mill discharge product size in relation to the lifting effect of the liners. In this specific case, it is obvious that a certain load expansion is needed to allow the coarse particles entering the media charge to be reduced. Therefore, at this stage, a direct measurement of the dynamics in the mill gives very valuable information to the operator.

More

The influence of mill speed and pulp density on the

The particles size distribution slope is not affected by the mill speed (see Graph 2) as the curves are mostly overlapping. Density These tests were done with a ∅0.82 x 1 m grate discharge mill with a 30 mm graded ball charge and a 30% filling degree. The mill discharge pulp density was increased from 68.8% to 75.9% solids.

More

Effect of ball and feed particle size distribution on the

Jun 01, 2018· In this article the effect of grinding media size distribution and feed material particle size distribution (PSD) on the product fineness requirements were investigated. A model free approach called the Attainable Region method was then applied in order to optimize the product size fineness in terms of the feed size and ball mix.

More

Ball Mill Design/Power Calculation LinkedIn

Dec 12, 2016· 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

More

ball mill filling degree calculation

Two chamb. mill sizing The Cement Grinding Office and initial idea for sizing a cement ball mill. calculation by changing the diameter value in point 5, the L/D ratio, the mill speed, the filling degree,

More

O. I. SKARIN N. O. TIKHONOV CALCULATION OF THE

feed for the rod mill, i.e. 10000 μm in accordance with Table. The value of P 80 is accepted based on the required grain-size characteristics of the ball mill discharge. Considering the Bond energy law and the correction factors by Rolland, the total specific energy E req required for comminution of mineral from the initial size F 80 (coarse

More

Grinding in Ball Mills: Modeling and Process Control

55 known as the distribution function [45, 46]) describes the distribution of fragment sizes obtained after a breakage of particles of size xj.Thus, b1j, b2j,,bnj are the mass fractions of particles in size classes 1, 2,,n after a breakage of particles in size class j. The mechanism of breakage is illustrated in [23] by a diagram shown in Fig. 3.

More

The dependence of specific discharge and breakage rate

May 01, 2013· This model structure is proposed for multi-compartment ball mills for the calculation of breakage (r) and discharge rate (d) functions in different segments of the mill using the experimentally measured mill inside size distributions (p 1 and p 2) and calculated mill feed and discharge size distributions (p 3), in addition to segment hold-up (s 1, s 2, s 3 and s 4).

More

Study of residence time distribution and mill hold-up for

Jan 01, 2011· The mill was loaded with 26.3 kg of 5-mm steel balls, corresponding to 60% of the mill volume filled by a ball bed. A steady-state condition was established by feeding the sand at a given feed rate until the solid discharge rate attained the same value as the feed rate and the size distribution of the product did not change with time.

More

Optimization of mill performance by using

mill discharge product size in relation to the lifting effect of the liners. In this specific case, it is obvious that a certain load expansion is needed to allow the coarse particles entering the media charge to be reduced. Therefore, at this stage, a direct measurement of the dynamics in the mill gives very valuable information to the operator.

More

TECHNICAL NOTES 8 GRINDING R. P. King

Grate discharge Dry Grate discharge Wet Overflow discharge Wet Figure 8.5 Effect of mill filling on power draft for ball mills. The data is taken from Rexnord Process Machinery Reference Manual, Rexnord Process Machinery Division, Milwaukee, 1976 The effect of varying mill speed on the power drawn by the mill is shown graphically in Figure 8.4

More

SAG Mill Grinding Circuit Design

Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the

More

MILLING CONTROL & OPTIMISATION Mintek

Millstar Ball Load Estimator Millstar Mill Power Filter MillStar Intelligent Filtering and Fault Detection for Level Signals, Density, feeder to determine the size distribution of feed material. Clusters of cyclones are often used for mill discharge classification. By controlling the number of open cyclones the pressure within the .

More

Optimum choice of the make-up ball sizes for maximum

Sep 01, 2013· smallest ball size in the mill [mm] d max. largest ball size in the mill [mm] f j. weight fraction in size interval i in the feed to the mill [–] f 90. 90% passing size of the feed [L] F 50.8. optimum weight fraction of 50.8 mm balls in the make-up [–] g i. weight fraction in size interval i

More

Study of residence time distribution and mill hold-up for

It is important to determine the residence time distribution (RTD) of a mill in order to predict the performance of the mill. In this study, the resid

More

Tubular Ball Mills ScienceDirect

Jan 01, 2016· A mill is required to grind 250 tph of limestone from an 80% passing size of 10 mm to 100 μm in a closed-circuit wet overflow discharge ball mill. Calculate the mill size required to handle the required throughput. Step 1. From Appendix B.1, the Bond Work index of limestone is 11.25 kWh/t.

More

Steel Ball Mills and Milling Equipment Paul O Abbé

2. NARROW PARTICLE DISTRIBUTION Solids milled in tumble mills are normally so fine and consistent in size that it’s rare to require classification. 3. REPEATABLE RESULTS Mill operating parameters including rotational speed, media size and milling duration can be independently controlled with known effect on the final results. 4.

More