effect of course sag mill feed on the ball mill

effect of course sag mill feed on the ball mill effect of course sag mill feed on the ball mill 46 7747 Ratings ] The Gulin product line, consisting of more than 30 …

(PDF) Influence of feed size on AG / SAG mill performance

Influence of feed size on AG / SAG mill performance INFLUENCE OF FEED SIZE ON AG/SAG MILL PERFORMANCE AG/SAG mills and ball mills within conventional processing circuits Less

Ball Mill Critical Speed & Working Principle - YouTube

Jun 19, 2015 · The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding The Motion of the Ball …

STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL …

STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL PERFORMANCE In order to measure the ball load in the mill, the feed to the mill was Slurry pooling is common in closed-circuit RoM mills

Modelling SAG milling power and specific energy

ness of the models For a given mill to have a combination of feed size, ball load, mill speed and % solids will represent the total load Ball Mill SAG Mill Scw Jb Pc % -6" +1" N/Nc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig 1 SABC A/B milling circuit

Semi-autogenous grinding (SAG) mill liner design and

mm (8 in) and water enter the feed end of a SAG mill through a feed chute; the ore is milled in the shell and milled product exits through grates and pulp lifters at the discharge end (Fig 1) The discharge is screened and the undersize, typically less than 12 mm (05 in), provides ball mill feed and the oversize is returned for further milling

Model Predictive Control for SAG Milling in Minerals

Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure The solution automatically controls ore master feed rate and water addition to increase

Optimization of mill performance by using - SciELO

Ball mills are usually the largest consumers of energy within a The mill and all feed streams should be stopped simultaneously but, often, they are stopped around about the same time Slurry effect of slurry rheology and flow rate on mill behaviour He

Autogenous and Semi-Autogenous Mills

AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill-ball circuit

(PDF) Understanding the effects of liner wear on SAG mill

Understanding the effects of liner wear on SAG mill performance the SAG, ball and verti-mills The fu ll feed to the mill was sampled through a SAG feed

Autogenous and Semi-Autogenous Mills

Autogenous and Semi-Autogenous Mills The optimum solution for wet grinding introduced into the large mill feed chutes And the product of the large AG/SAG grinding is either a finished size ready of processing, or an immediate size for further grinding in a ball mill, pebble mill, · AG with a crusher + ball mill · SAG-Single Stage

A Method of C alculating Autogenous/ Semi-Autogenous

This mill was put into single stage service due to the installation of the original circuit, including a 32 ft SAG mill, being put on hold This mill has been operating inefﬁ ciently due to the hard coarse feed The rod mill work index has not been de ned as yet The ball ﬁ mill work index is con rmed at 16 kWh/t

Choosing a SAG Mill to Achieve Design Performance

Choosing a SAG Mill To Achieve Design Performance John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, •The future effect on production levels as changes in metal prices occur lower feed rates resulted in falling mill charge volume, while at higher levels the

STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL PERFORMANCE

STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL PERFORMANCE In order to measure the ball load in the mill, the feed to the mill was Slurry pooling is common in closed-circuit RoM mills

Optimization of mill performance by using - SciELO

It is well known that ball milling efficiency varies during the lifetime of the shell liner For instance, the mill performance could become worse or better by putting in a new shell liner Data from pilot plant test work illustrates the influence of the shell lifting effect on the grind for a primary grinding duty

IMPROVEMENTS IN SAG MILL THROUGHPUT FROM …

IMPROVEMENTS IN SAG MILL THROUGHPUT FROM FINER FEED SIZE AT THE NEWMONT AHAFO OPERATION Ahafo operate a SAG mill, ball mill and pebble crusher (SABC) circuit that processes a range of identify where the opportunities were greatest and what effect the combined changes would have on mill performance

Comparison of Ore Hardness Measurements for Grinding …

Comparison of Ore Hardness Measurements for Grinding Mill Design for the Tenke Project John Starkey1, Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design pinion energy for rod and ball mills but not for SAG mills

The influence of mill speed and pulp density on the

THE INFLUENCE OF MILL SPEED AND PULP DENSITY ON THE GRINDING EFFICIENCY 89 The feed boxes (fine and coarse feed) are built into the top container The sizes of the available mills are: • ∅082 x 10 m (used for the testwork described below) • ∅13 x 22 m mill with a 30 mm graded ball charge and a 30% filling degree

What is a ball mill? What are its uses and advantages? - Quora

A ball mill is a grinding device that is used to turn material into fine powder Ball mills are cylindrical in shape, and are often the grinder of choice when it comes to mashing paints, ores, ceramic materials, and certain hard chemicals By rotating on a horizontal axis, a ball mill can effectively convert a hard material into a loose powder

TECHNICAL NOTES 8 GRINDING R P King - Mineral Tech

Figure 84 The effect of mill speed on the power drawn by a rotating mill The liner profile and the stickiness of the pulp in the mill can have a significant effect on the actual critical velocity Mills usually operate in the range 65 - 82% of critical but values as high as 90% are sometimes used

A Method to Determine the Ball Filling, in Miduk Copper

Keywords: Miduk Copper oncentrator, SAG Mill, Ball Filling Percentage Introduction Semi-autogenous (SAG) mills are autogenous mill and its effect on the mills power draw is of great value At the time of this research, mill ball charged, feed rate, and average moisture were 7 tons (ball size was 100 mm) per week, 720 t/h and 5%,

AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill

Reading & Lecture In ball mills, steel balls or hard pebbles to break particle based on impact and attrition A rotating mill charged with media and ore is lifted against the inside perimeter Some of the media falls and impacts the ore particles at the bottom of …

The operating principle of the ball mill - energosteel

The operating principle of the ball mill consists of following steps In a continuously operating ball mill, feed material fed through the central hole one of the caps into the drum and moves therealong, being exposed by grinding media

The operating principle of the ball mill - energosteel

The operating principle of the ball mill consists of following steps In a continuously operating ball mill, feed material fed through the central hole one of the caps into the drum and moves therealong, being exposed by grinding media

Effects of Ball Milling Conditions on Breakage Response of

where D is the mill diameter and d is the ball diameter The critical speed denotes the speed to be avoided It does not indicate the optimum speed The standard Bond’s test is performed at a mill speed of 091Vc [5] Sahoo and Roy [21] observed that ball mills usually operate at speed ranging from 65% to 75% of the critical speed

IMPROVEMENTS IN SAG MILL THROUGHPUT FROM …

SAG milling is followed by a 24 x 39 ft, 13 MW ball mill in closed circuit with a cluster of 26 inch (660 mm) cyclones After classification, the milling product is thickened and pumped as feed to carbon-in …

EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL …

EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL PERFORMANCE Niyoshaka Nistlaba Stanley Lameck A dissertation submitted to the Faculty of Engineering and The Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering Johannesburg, October 2005

Ball Mill: Operating principles, components, Uses

Ball mills grind material by impact and attrition The degree of milling in a ball mill is influenced by; Residence time of the material in the mill chamber The size, density and number of the balls The nature of the balls (hardness of the grinding material) Feed rate and feed level in …

Choosing a SAG Mill to Achieve Design Performance

SAG mill itself and not on the test work program Stated another way, money invested in a large SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates

Taking Control of the Mill Feed R2 - Mineral Consultants

TAKING CONTROL OF THE MILL FEED CASE STUDY - PARTIAL SECONDARY CRUSHING MT RAWDON Brian Putland the SAG and ball mill Diverting primary crushed ore to a surge bin ahead of a secondary crusher, The effect of feed size in AG/SAG milling has been studied extensively with an early review presented by Abel (1997), whilst the relationship

Optimization of the Design of SAG Mill Internals Using

Optimization of the Design of SAG Mill Internals Using High Fidelity Simulation by John A Herbst Svedala Optimization Services and undisclosed behavior resulting from end-effects The power draw of the feed and discharge The selection of an optimum top ball size for a large SAG mill is determined by several factors:

Application of Operating Work Indices in Autogenous

a large effect on profitability Mill operators have long used operating work indices to evaluate grinding circuit ball mill feed for the ball mill power calculation power draw of AG/SAG and ball mills Note that the ball mill operating work

The influence of mill speed and pulp density on the

THE INFLUENCE OF MILL SPEED AND PULP DENSITY ON THE GRINDING EFFICIENCY 89 The feed boxes (fine and coarse feed) are built into the top container The sizes of the available mills are: • ∅082 x 10 m (used for the testwork described below) • ∅13 x 22 m mill with a 30 mm graded ball charge and a 30% filling degree

A new autogenous and semi-autogenous mill model for scale

A new autogenous and semi-autogenous mill model for scale-up, design and optimisation The resultant model should be applicable to all AG and SAG mills as well as ball mills J, 1993 Further Development of an Autogenous and Semi-autogenous Mill Model MEng Sci Thesis, University of Queensland, Australia Google Scholar

Robust control of a SAG mill - ScienceDirect

The fresh ore feed (flowrate f 1) is mixed with two recycled streams (the scats f 4 and the primary cyclone underflow f 8), with the combined feed passing to the SAG mill f 2 Water f 3 is added to the SAG mill, as needed, so that in the output f 11, the solids density is held at a set value

The Selection and Design of Mill Liners - MillTraj

The Selection and Design of Mill Liners Integral wave blocks – These are commonly used in ball mills, and the profile of the liners Was generally used for mill liners (AG, SAG and Ball) prior to the movement to higher carbon content steels It has excellent wear

Advanced Simulation for Semi-Autogenous Mill Systems: A

Advanced Simulation for Semi-Autogenous Mill S ystems: A Simplified Models Approach 147 description it is necessary to consider the relationship between the feed stream and mill charge level This relationship is known as the transport rate and is probably the least developed aspect in models proposed so far (Apelt et al, 2002 a,b)